US20060241400A1 - Method of determining the position of an instrument relative to a body of a patient - Google Patents
Method of determining the position of an instrument relative to a body of a patient Download PDFInfo
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- US20060241400A1 US20060241400A1 US11/422,270 US42227006A US2006241400A1 US 20060241400 A1 US20060241400 A1 US 20060241400A1 US 42227006 A US42227006 A US 42227006A US 2006241400 A1 US2006241400 A1 US 2006241400A1
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- probe
- relative
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- forehead
- ring
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Abstract
A system for determining a position of a probe relative to an object such as a head of a body of a patient. The head includes a surface such as a forehead having a contour. Cross sectional images of the head are scanned and stored as a function of the forehead contour. If the forehead contour does not appear in the scan images, then the position of the forehead contour relative to the scan images is determined with an optical scanner and a ring. During surgery, the optical scanner also determines the position of the forehead relative to the ring. An array for receiving radiation emitted from the probe and from the ring generates signals indicating the position of the tip of the probe relative to the ring. A stereotactic imaging system generates and displays an image of the head corresponding to the measured position of the tip of the probe. The system may also display scan images from different scanning technologies which scan images correspond to the same position in the head.
Description
- This application is a continuation of Ser. No. 10/068,064, filed Feb. 5, 2002, allowed, which is a divisional of Ser. No. 09/457,699, filed Dec. 9, 1999, now U.S. Pat. No. 6,374,135, which is a continuation of Ser. No. 09/243,804, filed Feb. 3, 1999, now U.S. Pat. No. 6,076,008, which is a continuation of Ser. No. 08/477,561, filed Jun. 7, 1995, now U.S. Pat. No. 5,891,034, which is a continuation of Ser. No. 08/053,076, filed Apr. 26, 1993, abandoned, which is a continuation-in-part of Ser. No. 07/909,097, filed Jul. 2, 1992, now U.S. Pat. No. 5,383,454 and is a continuation-in-part of Ser. No. 07/858,980, filed May 15, 1992, abandoned, and said Ser. No. 07/909,097, filed Jul. 2, 1992 is a continuation of Ser. No. 07/600,753, filed Oct. 19, 1990, abandoned and said Ser. No. 07/858,980 is a continuation-in-part of PCT/US91/07745, filed Oct. 17, 1991, which is a continuation-in-part of Ser. No. 07/600,753, filed Oct. 19, 1990, abandoned.
- Precise localization of position has always been critical to neurosurgery. Knowledge of the anatomy of the brain and specific functions relegated to local areas of the brain are critical in planning any neurosurgical procedure. Recent diagnostic advances such as computerized tomographic (CT) scans, magnetic resonance imaging (MRI) scanning, positron emission tomographic (PET) scanning, and magnetoencephotographic (MEG) scanning have greatly facilitated preoperative diagnosis and surgical planning. However, the precision and accuracy of the scanning technologies have not become fully available to the neurosurgeon in the operating room. Relating specific structures and locations within the brain during surgery to preoperative scanning technologies has previously been cumbersome, if not impossible.
- Stereotactic surgery, first developed 100 years ago, consists of the use of a guiding device which channels the surgery through specific parts of the brain as localized by preoperative radiographic techniques. Stereotactic surgery was not widely used prior to the advent of modern scanning technologies as the injection of air into the brain was required to localize the ventricles, fluid containing chambers within the brain. Ventriculography carried a significant complication rate and accuracy in localization was marginal.
- It is an object of this invention to provide a system which can determine the position of a probe within an object and display an image corresponding to the determined position. It is a further object of this invention to provide a system which can determine the position of an ultrasound probe relative to an object and, still further, which can display scan images from other scanning technologies corresponding to the scan images produced by the ultrasound probe. It is a further object of this invention to provide a system which can relate scan images of an object produced with one technology to scan images of the same object produced with another technology.
- The invention comprises a system for indicating a position within an object. The system includes reference points means in fixed relation to the object. Means generates images of the object, said images including reference images corresponding to the reference points means. The system also includes reference means located outside the object and a probe including a tip. First means determines the position of the tip of the probe relative to the reference means. Second means measures the position of the reference points means of the object relative to the reference means, so that the position of the tip relative to the reference points means of the object is known. Means translates the determined position of the tip of the probe into a coordinate system corresponding to the images of the object. Means displays an image of the object which corresponds to the translated position of the tip of the probe.
- The invention also comprises a system for indicating a position within a body of a patient. The system includes reference points means in fixed relation to the body. Means generates images of the body, said images including reference images corresponding to the reference points means. The system further includes reference means located outside the body and a probe including a tip. First means determines the position of the tip of the probe relative to the reference means. Second means determines the position of the reference points means of the body relative to the reference means, so that the position of the tip relative to the reference points means of the body is known. Means translates the determined position of the tip of the probe into a coordinate system corresponding to the images of the body. Means displays an image of the body which corresponds to the translated position of the tip of the probe.
- The invention also comprises a method for indicating a position of a tip of a probe which is positioned within an object such as a body on images of the body wherein the body and the images of the body include reference images corresponding to a reference point. The method includes the steps of determining the position of the tip of the probe relative to a reference means having a location outside the body; determining the position of the reference points of the body relative to the reference means so that the position of the tip relative to the reference points of the body is known; translating the determined position of the tip of the probe into a coordinate system corresponding to the images of the body; and displaying an image of the body which corresponds to the translated position of the tip of the probe.
- The invention also comprises a system for determining a position of an ultrasound probe relative to a part of a body of a patient wherein the probe is positioned adjacent to and scanning the body part. An array is positioned in communication with the probe. First means determines the position of the ultrasound probe relative to the array. Second means determines the position of the body part relative to the array. Means translates the position of the ultrasound probe into a coordinate system corresponding to the position of the body part.
- The invention also comprises a system for relating scan images of a body of a patient. The scan images are produced from first and second scanning technologies. The system includes reference points means in fixed relation to the body. Means relates the first scanned images to the reference points means. Means relates the second scanned images to the reference points means. Means selects a particular first scanned image. Means determines the position of the particular first scanned image relative to the reference points means. Means generates a second scanned image which has the same position relative to the reference points means as the determined position so that the generated second scanned image corresponds to the particular first scanned image.
- The invention also comprises apparatus for indicating a position relative to a body of a patient. The apparatus comprises radiopaque markers and means for noninvasively supporting the markers on the surface of the skin of the body. The supporting means may comprise a sheet of material overlying the body, and means on the sheet of material for supporting the markers.
- The invention may be used with a scanner for scanning a body part of a patient in order to generate images representative of the body part. The improvement comprises means for marking the surface of the skin on the body part with a radiopaque material, whereby the generated images include images of the marking means.
- Other objects and features will be in part apparent and in part pointed out hereinafter.
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FIG. 1A is a perspective illustration of a reference ring of the prior art which is mounted by uprights to a patient's head to support the cylindrical frame structure ofFIG. 1B or thering 306 ofFIG. 3B . -
FIG. 1B is a perspective illustration of a cylindrical frame structure of the prior art which is mounted around a patient's head during the scanning process. -
FIG. 1C is a plan view according to the prior art of the rods of the cylindrical frame structure ofFIG. 1B taken along a plane midway between the upper and lower rings. -
FIG. 1D is a perspective illustration of the coordinate system of a three dimensional scanned image. -
FIG. 2A is a perspective view of the caliper frame of the prior art used to target a position in the brain and to determine a position in the head relative to the phantom base. -
FIG. 2B is a perspective view of the caliper frame of the prior art ofFIG. 2A illustrating its angles of adjustment.FIG. 2C is a block diagram of the steps involved in the prior art process of determining the position of a probe relative to the scanned images so that the image corresponding to the probe position can be identified and viewed by the surgeon. -
FIG. 2D is a perspective illustration of a three dimensional coordinate system of a probe. -
FIG. 3A is a block diagram of one system of the invention for indicating the position of a surgical probe within a head on an image of the head. -
FIG. 3B is a perspective schematic diagram of a microphone array, probe and base ring according to one system of the invention. -
FIG. 3C is a block diagram of the steps involved in the process according to the invention for determining the position of a surgical probe relative to the scanned images so that the image corresponding to the probe position can be identified and viewed by the surgeon. -
FIG. 3D is an illustration showing three reference points on a head for use as a frame of reference during preoperative scanning and surgery. -
FIG. 4A is a perspective schematic diagram of an infrared detector array, probe, reference bar, clamp and optical scanner according to one system of the invention. -
FIG. 4B is a block diagram of a system for use with the apparatus ofFIG. 4A for determining the contour of a forehead. -
FIG. 5 is a flow chart of the translational software for translating coordinates from the probe coordinate system to the scanned image coordinate system according to the invention. -
FIG. 6A is a perspective schematic diagram of a detector array, reference bar, clamp and ultrasound probe according to one system of the invention; -
FIGS. 6B and 6C illustrate ultrasound and scanned images, respectively. -
FIG. 7 illustrates the orientation of the base ring with a scanning plane for relating the position of a probe with a scanned image or for interrelating the scanned images of different scanning technologies which correspond to a common position in the head according to one system of the invention. -
FIG. 8 illustrates the use of a remote depth finder for determining the contour of a forehead. -
FIGS. 9 through 11 illustrate apparatus including a cap and grommets for holding radiopaque markers during scanning. - Corresponding reference characters indicate corresponding parts throughout the several views of the drawings.
- With the advent of modern scanning equipment and techniques, several stereotactic systems have been developed and are presently available. These stereotactic systems allow a surgeon to localize specific points detected on CT, MRI, PET, or MEG scans which have been previously generated prior to the surgical procedure being performed. In particular, the stereotactic systems allow the selection of specific points detected on the scans to be localized within the brain by the surgeon during the surgical procedure using a mechanical device.
- In use, the prior art stereotactic systems often require a base such as a ring 120 (also known as a BRW head ring) in
FIG. 1A .Ring 120 is firmly attached to the patient's skull viauprights 122 andsharp pins 124 throughout scanning and surgery. - During scanning, some form of localizing device, such as a
cylindrical structure 100 inFIG. 1B , is attached to ring 120.Structure 100 comprises an uppercircular ring 102 in parallel with a lowercircular ring 104.Lower ring 104 is mounted toreference ring 120 so that the threerings Rings vertical rods 106 and threediagonal rods 108. These specific marking rods are also called fudicels. The threediagonal rods 108 diagonally interconnect rings 102 and 104. Any plane orthogonal to anaxis 110 ofstructure 100 which passes throughstructure 100 will create a unique pattern of six cross sectional views ofrods 106 and three cross sectional views ofrods 108. The resultant spacing between the diagonal and upright rods defines a unique orthogonal plane withinstructure 100.FIG. 1C shows, for example, the spacing of the rods when the position of thescan plane 112 is parallel to and midway betweenrings structure 100. - After the scanning process, the images obtained are analyzed and the position of
rods rods base ring 120 can be determined. As shown inFIG. 1D , the scans can be arranged within a scanned image coordinatesystem 125 with the reference plane RP set in fixed relation to the position ofring 120. A scan plane SP can be defined within the scanned image coordinatesystem 125 by at least three reference points SP1, SP2 and SP3 located on the head of the patient. By associating a scan image with a scan plane SP in the scanned image coordinate system, a point on the scan can be identified with a point in the patient's head. - During surgery, the surgeon can use the stereotactic system to calculate a specific position within the brain corresponding to a scan image and then target that portion of the brain with a probe. First, the
structure 100 used during scanning is removed fromring 120 and a specially designedcaliper frame 200, as illustrated inFIG. 2A , is attached to ring 120.Frame 200 holds asurgical probe 202 which is positioned on an arch 206 for insertion into the patient's head.Frame 200 indicates the alpha, beta, gamma and delta angles onscales probe 202 to a particular target, as shown inFIG. 2B . Thedistance 216 from the tip ofprobe 202 toarch 206 is also determined. A computer is then used to correlate the position of the targeted scan image in the scanned image coordinate system with the corresponding angles alpha, beta, gamma and delta anddistance 216 onframe 200 to enable the surgeon to apply the probe to the targeted area of the brain. A target picked out on a scan of a specific image can be approached with a fair degree of accuracy using this surgical procedure. - In the past, the surgeon has also used the stereotactic system in reverse in order to determine the position of the
probe 202 in the brain relative to the scanned images so that the scan image corresponding to the probe position can be identified and viewed. To do this, the surgeon again attachesframe 200 toring 120.Probe 202 is then positioned inframe 200 and inserted into the brain.Frame 200 is then removed fromring 120 and mounted to aphantom base 250 in a manner as illustrated inFIG. 2A .Phantom base 250 has a coordinate system (X1, Y1, Z1). Generally,caliper frame 200 identifies apoint 201 overphantom base 250. Apointing device 252 is positioned to have itstip 254 atpoint 201. The X1-Y1 plane ofphantom base 250 is parallel to the plane in which the reference points RP1, RP2 and RP3 are located. The (X1, Y1, Z1) coordinates define the position ofpoint 201. As a result, the position ofpoint 254 with respect to the X1-Y1 plane and, therefore, with respect to the reference plane RP is now known. A computer is used to calculate the specific position within the brain and the particular scan which corresponds to the calculated position can now be accessed and viewed on a scanning system. This prior art process is shown in diagram form inFIG. 2C . - After this cumbersome and time-consuming process, the surgeon has now determined the position of the
tip 201 ofprobe 202 with respect to the scanned images and can now view the image corresponding to the probe position to decide the next step in the surgical procedure. This entire process takes approximately ten to fifteen minutes and increases the risks of intraoperative contamination as the base offrame 200 is nonsterile. Because of these considerations, this surgical procedure is not commonly performed. - Although stereotactic surgery as performed with the apparatus of the prior art allows a surgeon to be guided to a specific point with accuracy, it has not been particularly useful in allowing the surgeon to identify the particular location of a probe within the brain at any point during the surgical process. Frequently in neurosurgery, brain tumors or other target points within the brain are indistinguishable from surrounding normal tissue and may not be detected even with the use of frozen sections. Moreover, with modern microsurgical techniques, it is essential that the neurosurgeon identify specific structures within the brain which are of critical functional importance to the patient. The boundaries of these structures must be accurately defined and specifically known to the surgeon during the surgical process. In this way, these tissues will not be disturbed or otherwise damaged during the surgical process which would otherwise result in injury to the patient. The minimal accuracy afforded by stereotactic surgery is generally insufficient for modern microsurgical techniques. Consequently, stereotactic surgery is not generally available to the majority of patients undergoing surgery.
- The present invention solves these problems by allowing the surgeon to retrieve and display quickly the scanned image which corresponds to the current position of a
tip 301 of asurgical probe 302. A cursor appears on the displayed scan to show the position ofprobe tip 301 within the displayed scan.FIGS. 3A-3C and 5 illustrate a system of the invention which includessound emitters microphone detectors 350 and associated hardware to determine the position ofprobe tip 301 relative to areference ring 306 on the patient's head. Because the position of the scanned images relative toreference ring 306 is known from the scanning procedure, the position ofprobe tip 301 relative to the scanned images is known and the relevant image can be displayed. FIGS. 3A and 4A-8 illustrate a system of the invention which includesinfrared emitters detectors 550 in place of thesound emitters microphone detector 350 for determining the position of areference bar 548 and aprobe tip 541. Acomputer 396 and aninfrared scanner 380 relate the scanned images to the shape of the forehead and relate the shape of the forehead to the position ofreference bar 548.Reference bar 548 is then associated with the scanned images through the forehead shape without the use of thecylindrical reference frame 100 during scanning. The use of the forehead shape as a reference point also allows the scanned images from different scanning technologies to be interrelated. As an alternative toreference ring 306 andreference bar 548 described above,FIG. 3D uses reference pins 307 affixed to the skull for determining the position of the patient's head during surgery. As a further alternative,FIGS. 9-11 use a removable cap for holding markers during scanning. The positions of the markers are marked on the head for later use during surgery in registering the surgical space with the scan images.FIG. 6 includes anultrasound probe 500 for use during surgery. Other advantages are also provided as more fully described below. - In relating the position of a probe tip, e.g.,
probe tip 301, to a scanned image, it can be seen inFIGS. 1D and 2D that the surgeon must know the specific location oftip 301 with respect to the scanned image coordinate system (Xo, Yo, Zo) of the scans that were preoperatively performed. In other words,probe tip 301 has a particular coordinate system (X2, Y2, Z2) which is illustrated inFIG. 2D . Ideally, the surgical probe coordinate system (X2, Y2, Z2) must be related to the scanned image coordinate system (Xo, Yo, Zo). The prior art as illustrated inFIG. 2B has suggested relating these coordinate systems via the phantom base coordinate system (X1, Y1, Z1). However, as noted above, this relational process is inaccurate, time-consuming and cumbersome. The invention uses a 3D digitizer system to locate the position ofprobe tip 301 within the probe coordinate system (X2, Y2, Z2) and to relate it to the scanned image coordinate system (Xo, Yo, Zo) -
FIGS. 3A and 3B show amicrophone array 300, atemperature compensation emitter 304, asurgical probe 302, and abase ring 306.Microphone array 300 includes a plurality ofmicrophones 350 which are preferably spaced one meter apart.Microphones 350 may be attached to the operating light above the patient's head in direct line of sight of all of theemitters Microphones 350 thereby detect the sound emitted from the emitters.Surgical probe 302 preferably is a surgical coagulating forceps such as a bipolar coagulating forceps.Probe 302 could also be a drill, suction tube, bayonet cauterizing device, or any other surgical instrument modified to carry at least twosound emitters 360 thereon for determining position.Emitters 360 onprobe 302 are essentially coaxial on anaxis 362 withtip 301.Emitters 360 are in line and immediately below the surgeon's line of sight so that the line of sight is not blocked.Probe 302 has a bundle ofwire 364 attached thereto for connection to an electrical power source. The wires required to energizeemitters 360 are combined withbundle 364. The surgeon is familiar with handling such a probe connected to a wire bundle; therefore, this apparatus does not inconvenience the surgeon. During surgery,ring 306 is affixed to thereference ring 120 attached to the patient's head and is essentially coplanar with it.Ring 306 includes a plurality ofemitters 370 which are preferably positioned 90 degrees apart with the center emitter being located at the anterior of the head. This permitsring 306 to be mounted around the head so that all three emitters are in line of sight witharray 300. - In use, the position of each of
emitters microphones 350 inarray 300. A3D digitizer 312 controls this operation through asignal generator 308 and amultiplexer 310.Digitizer 312 may be an off-the-shelf Model GP-8-3D three dimensional sonic digitizer produced by Scientific Accessories Corporation. Under the control ofdigitizer 312,multiplexer 310 applies an energizing signal fromsignal generator 308 first to atemperature compensation emitter 304, then sequentially toemitters 370 onring 306, then sequentially toemitters 360 onprobe 302. During this time,digitizer 312 receives and digitizes the output signals produced bymicrophones 350 in response to the energizations of the emitters. The digitized output signals are output to acomputer 314. -
Computer 314, following the flow chart shown inFIG. 5 as more fully described below, is programmed with the predetermined pattern and timing for energizingemitters Computer 314 includes a spatial acquisition and recording (SAR)program 316 which acquires and records spatial coordinates based on the digitized signals. For example, theSAR program 316 may be the SACDAC program licensed by PIXSYS of Boulder, Colo.SAR program 316 measures the time of transmission from each of the emitters to each of themicrophones 350. By comparing these times,SAR program 316 calculates the position of each ofemitters ring 306 contains threeemitters 370,SAR program 316 can calculate the position ofring 306 through standard geometric computations. This plane essentially defines the reference plane of the scan images because it is coplanar with the reference points RP1, RP2 and RP3 in the scanning coordinate system ofFIG. 1D . Similarly, sinceprobe 302 contains twoemitters 360,SAR program 316 can calculate the position ofprobe tip 301 through standard geometric computations. AfterSAR program 316 determines the respective positions ofring 306 andprobe tip 301 relative toarray 300, it next determines the position ofring 306 relative to tip 301 within the probe coordinate system ofFIG. 2D . - One consideration in using sound emitters to determine position is that the speed of the emitted sound will vary with changes in the temperature of the air in the operating room. In other words, since the system is very accurate, the period of time that it takes from the instant a
particular emitter microphones 350 ofarray 300 receives the sound will vary with air temperature. In order to calibrate the system for these changes,temperature compensation emitter 304 is located in a fixed position relative toarray 300.Temperature compensation emitter 304 may be, for example, a sonic digitizer as is used in the Scientific Accessories Corporation Model GP-8-3D.SAR program 316 knows, through calibration, the distance betweentemperature compensation emitter 304 and each of themicrophones 350 ofarray 300. The speed of sound transmitted fromtemperature compensation emitter 304 tomicrophones 350 is measured by the SAR program and compared against the known distance to determine the speed at which the sound is being transmitted through the air. Therefore,SAR program 316 can immediately calculate the reference standard, i.e., the velocity of the emitted sound through the air. This instantaneous reference is applied to the sound emitted from theother emitters - After
SAR program 316 has accurately determined the position ofprobe tip 301 in the probe coordinate system shown inFIG. 2D , it outputs the coordinates totranslational software 318 incomputer 314.Translational software 318 then translates the coordinates from the surgical probe coordinate system ofFIG. 2D into the scanned image coordinate system shown inFIG. 1D , as more fully described below. Amemory 320 accessed through a local area network (LAN) 321 stores each of the images of the preoperative scan according to the respective positions of the scans within the scanned image coordinate system ofFIG. 1D . The respective positions of the scans are known from the position ofrods memory 320. The translated coordinates generated bytranslational software 318 are provided to stereotacticimage display software 322, also resident withincomputer 314. Stereotacticimage display software 322 actuates astereotactic imaging system 324 to generate a scan image from the data stored inmemory 320 corresponding to the translated coordinates.Stereotactic imaging system 324 displays the generated image on ahigh resolution display 326.Display 326 preferably displays the axial, saginal and coronal views corresponding to probetip 301. Stereotacticimage display software 322 andstereotactic image system 324 may be any off-the-shelf system such as manufactured by Stereotactic Image Systems, Inc. of Salt Lake City, Utah. This cycle of calibrating the system throughtemperature compensation emitter 304, sequentially energizingemitters ring 306 and probe 302, and generating and displaying a scan image corresponding to the position ofprobe tip 301 all occur each time the surgeon closes a switch to activate the system. The switch (not shown) may be positioned onprobe 302, in a floor pedal (not shown), or wherever else may be convenient to the surgeon. - As seen above,
ring 306 is one apparatus for determining and positioning the reference points RP1, RP2 and RP3 with respect tomicrophone array 300. An advantage ofring 306 is that, eachtime emitters 360 onprobe 302 are energized,emitters 370 onring 306 are also energized to redefine the reference plane. This allows the surgeon to move the patient's head during surgery. - Alternatively, as shown in
FIG. 3D , the reference points RP1, RP2 and RP3 can be established with the3D digitizer 312 and three reference pins 307. Reference pins 307 are radiolucent surgical screws with radiopaque tips.Pins 307 are permanently affixed to the patient's skull before surgery and before the preoperative scanning. The radiopaque tips thereby provide a constant reference during scanning and throughout the stereotactic surgical procedure. During surgery,probe tip 301 is positioned on each ofpins 307 and actuated to emit a signal which is detected bymicrophone array 300 and output to3D digitizer 312. This allows the position oftip 301 to be determined at each of these points. This is performed during a reference mode of operation of3D digitizer 312. At the end of the reference mode,SAR program 316 calculates the position of the reference points RP1, RP2 and RP3. The use ofpins 307 requires that the reference points have to be reestablished before the position ofprobe 302 is determined to avoid changes in the reference plane due to movement of the head. A further variation contemplates thatemitters 370 may each be separately mounted topins 307 or other fixed structures positioned at each of the reference points. - In summary, this process according to the invention is illustrated in
FIG. 3C and identifies the location ofprobe tip 301 for the surgeon. Initially, the reference plane is determined by energizingring 306 or by positioningprobe tip 301 at the reference points. Next, the emitters ofprobe 302 are energized so that the position ofprobe tip 301 in the head is determined in the probe coordinate system (X2, Y2, Z2).Translational software 318 then converts the probe coordinate system into the scanned image coordinate system (Xo, Yo, Zo) so that the image corresponding to the position ofprobe tip 301 can be generated and displayed. - In another system of the invention as shown in
FIG. 4A ,infrared emitters array 552 ofdetectors 550 are used respectively in place ofsound emitters microphones 350 ofFIG. 3B . Fixedreference bar 548, asurgical probe 542, and related components are used in place ofring 306,probe 302, and related components ofFIG. 3B . AMayfield clamp 570 of known construction is used in place ofring 120 for rigid attachment to the patient'shead 394.Clamp 570 includessharp pins 572 attached toadjustable jaws Clamp 570 is thereby adjusted for rigid attachment to head 394.Reference bar 548 is rigidly attached to clamp 570 so that there is no relative movement betweenbar 548 andhead 394. No temperature compensating emitter such asemitter 304 inFIG. 3B is required inFIG. 4A because the apparatus ofFIG. 4A uses the position ofemitters FIG. 3B . - In use,
infrared detectors 550 are attached to a mountingbar 551 in fixed relation to each other.Detectors 550 are generally positioned so that their views converge on a phantom point. For example, the twoouter detectors center detector 550C would view a horizontal plane. This can be accomplished by employing vertical slits on the field of view of the outer detectors and a horizontal slit on the field of view of the center detector. The phantom point is set to be in the general vicinity of the patient'sforehead 390. Mountingbar 551 is suspended from the operating room light in direct line of sight of the patient'sforehead 390 and ofemitters Detectors 550 thereby detect the infrared light emitted fromemitters Detectors 550 include a large number of linear chip cameras such as CCD (charge coupled device) cameras or pixels. A cylindrical lens (not shown) may also be used behind the slits indetectors 550 to collimate the infrared light. By knowing which particular pixel of the large number of pixels found in each of the threedetectors 550 receives the infrared light fromemitters detectors 550 can be determined and, therefore, the positions of each ofemitters probe tip 541 within the scan image coordinate system is known. - The apparatus of
FIGS. 4A, 4B , 6A, 7 and 8 may be controlled with the computer and other hardware shown inFIG. 3A using the software shown inFIG. 5 . Apart from the use of infrared light in place of sound and the measurement of the position of the emitters through geometry instead of the timed delay of sound, the operation of this hardware and software parallels the operation disclosed above. - An advantage of using infrared light is that it allows for the use of the contour of a portion of the patient's
head 394, preferably theforehead 390 above and around the patient's eyes, to relate the position of theprobe 542 to the scan images. This is accomplished with anoptical scanner 380 which generates an infrared laser beam which is reflected off of the patient'sforehead 390 in timed sequence with the firing ofemitters 545 to determine the forehead contour relative toreference bar 548. Such optical scanning of the forehead allows preoperative scanning to occur well in advance of anticipated surgery and without intubation. Other benefits and features of the improvement are more fully explained below. - In particular,
FIGS. 4A and 4B includeinfrared detector array 552,probe 542,reference bar 548 andoptical scanner 380.Surgical probe 542 preferably is a surgical coagulating forceps such as a bipolar coagulating forceps.Probe 542 could also be a drill, suction tube, bayonet cauterizing device, or any other surgical instrument modified to carry at least twoinfrared emitters 540 thereon for determining position.Emitters 540 onprobe 542 are essentially coaxial on anaxis 544 withtip 541.Emitters 540 are in line and immediately below the surgeon's line of sight so that the line of sight is not blocked.Probe 542 has a bundle ofwire 364 attached thereto for connection to an electrical power source. The wires required to energizeemitters 540 are combined withbundle 364.Bar 548 comprises a bar with a plurality of at least threeinfrared emitters 545 positioned thereon. During surgery, the line of sight between some of theemitters 545 and thearray 552 may be blocked by a surgical hose or other object. This could temporarily preventarray 552 from detecting the position ofbar 548. Accordingly, it is preferable to place more than three emitters (e.g., seven or eight emitters) onbar 548 so that the line of sight for at least three emitters is always maintained. Such additional emitters can also be used to more precisely locate the position ofbar 548.Bar 548 which holdsemitters 545 is also preferably positioned slightly away fromhead 394 for increased clearance aroundhead 394 and to reduce the number of instances where the line of sight betweenemitters 545 andarray 552 is blocked.Optical scanner 380 is generally located in front of the patient'sforehead 390.Optical scanner 380 and its associated software to generate a forehead image are standard, off-the-shelf components such as those used to scan an object to determine its three-dimensional shape. For example, a limb scanner such as the PIXSYS Optical Scanner used to develop three-dimensional models for artificial limbs may be used. - During the preoperative scanning process, when the cross sectional scanned images of the patient's
head 394 are created,head 394 is fastened securely in a cushionedcradle 392 with surgical straps (not shown). If the contour offorehead 390 appears in the scan images, thencomputer 396 employs foreheadfitting software 398 to derive the forehead contour from the scan images and to database the scan images as a function of the forehead contour inmemory 320. If the scan images do not show theforehead 390, then (as shown inFIG. 7 )head 394 is firmly clamped in fixed relation with a reference source, such as aring 590, havingemitters 592 thereon.Optical scanner 380 is then used to determine the position of the forehead contour relative to ring 590 (as more fully described below). Because the position of the scan images relative to ring 590 is known from the scanning procedure, the position of the scan images relative to the forehead contour is known. This information is then databased inmemory 320 and used during surgery to relate the position ofprobe 542 to the scan images. - Forehead scanning with
optical scanner 380 is accomplished in the following way. During preoperative scanning,head 394 is rigidly attached to ring 590 inFIG. 7 . This attachment may be accomplished with a base ring (not shown) such asring 120 inFIG. 3B . Under the control of3D digitizer 312,scanner 380 emits an infrared laser beam which bounces off a single point onforehead 390 and is detected byarray 552.Computer 396 determines the position in space of this first point onforehead 390, such as by triangulation. Next,emitters 592 onring 590 are energized sequentially.Array 552 detects these emissions andcomputer 396 determines the relation between the first detected position onforehead 390 and the position ofring 590. This process is repeated many times, withscanner 380 tracing a path acrossforehead 390. All of the data comprising the position of each point of reflection fromforehead 390 and the related position ofring 590 is input into foreheadfitting software 398 ofcomputer 396.Computer 396 thereby determines the contour offorehead 390 and, thus, the position of the forehead contour relative to ring 590. Foreheadfitting software 398 may be any off-the-shelf or custom software which graphs a set of points so that a curve defining the contour of the forehead can be calculated.Computer 396 then outputs data relating the position of the forehead contour with the position ofring 590 totranslational software 318 ofcomputer 314. During scanning, the position of the scan images relative to ring 590 is known so that the position of the scan images relative to the forehead contour is also known. Accordingly, the scan images are stored inmemory 320 as a function of the forehead contour. - Prior to surgery,
head 394 is clamped with a mechanism such as theMayfield clamp 570 shown inFIG. 4A for maintaininghead 394 in rigid position.Reference bar 548 is rigidly attached to clamp 570 withemitters 545 in line of sight witharray 552.Optical scanner 380 next scans the forehead to determine the position of the forehead contour relative to bar 548. The forehead contour derived from this second optical scanning is matched to the forehead contour stored for the scanned images inmemory 320 so that the current position ofbar 548 with respect to the scanned images is known. The forehead contour matching between the stored forehead contour and the forehead contour derived from the second optical scanning is accomplished using the well known Pellazari Chen algorithm or any other suitable surface matching algorithm.Bar 548 used during surgery includesemitters 545 which communicate witharray 552 to establish the position ofbar 548. Since the position ofprobe 542 relative to bar 548 is known (because of communication viaemitters bar 548 relative to the scanned images is known, the position ofprobe 542 relative to the scanned images is known. Accordingly, a scanned image corresponding to the position oftip 541 ofprobe 542 is generated and displayed. - One advantage of using either
optical scanner 380 orsurgical pins 307 in establishing a reference is that the reference ring, such asring 120, is removed after preoperative scanning and before surgery. This is advantageous because the patient can not be intubated whilering 120 is attached to the skull. In the prior art, wherering 120 can not be removed during the time between preoperative scanning and surgery, the patient must be intubated (and therefore anesthetized) prior to preoperative scanning. Thus, by using the contour offorehead 390 to define the reference point, the preoperative scanning is performed without the need for intubation and the anesthesia accompanying it. This is particularly advantageous during PET, MEG and any other type of functional scanning where the patient must be conscious to elicit behavior during scanning. It is also advantageous during any form of scanning where the medical equipment for providing intubation and anesthetic would otherwise interfere with the scanning technology, such as MRI scanning. - In summary, when CT scanning is used, the patient lies with the head held in place on a CT table during the preoperative scanning process. The scans are organized in
memory 320 according to the forehead contour appearing in the scans. Prior to surgery, the patient'shead 394 is rigidly held in a Mayfield clamp or similar clamp on whichreference bar 548 is mounted.Optical scanner 380 is then used to determine the patient's forehead contour relative to bar 548. Since the position of the scan images relative to the forehead contour is already known, the position ofbar 548 relative to the scan images is known. During surgery, the surgeon positions probe 542 in the position desired withinhead 394.Emitters 540 ofprobe 542 andemitters 545 ofbar 548 are then energized so that the position ofprobe tip 541 relative to bar 548 and, therefore, relative to the scan images is known. This is accomplished through thetranslational software 318 which converts the probe coordinate system (X2, Y2, Z2) into the scanned image coordinate system (Xo, Yo, Zo) so that the image corresponding to the position ofprobe tip 541 can be generated and displayed. - Further summarizing, when MRI, PET or MEG scanning is used, the patient lies on an MRI, PET or MEG table with
head 394 rigidly attached toring 590.Optical scanner 380 then scansforehead 390 to determine the position of the forehead contour relative to ring 590. The MRI, PET or MEG scanning is then performed and the scan images are produced in known relation to the position ofring 590 and, therefore, in known relation to the forehead contour. The scans are organized inmemory 320 according to the forehead contour. Prior to surgery,head 394 is rigidly held in a Mayfield clamp or similar clamp on whichreference bar 548 is mounted.Optical scanner 380 is then used to determine the patient's forehead contour relative to bar 548. Since the position of the scan images relative to the forehead contour is already known, the position ofbar 548 relative to the scan images is known. During surgery, the surgeon positions probe 542 in the position desired withinhead 394.Emitters 540 ofprobe 542 andemitters 545 ofbar 548 are then energized so that the position ofprobe tip 541 relative to bar 548 and, therefore, relative to the scan images is known. This is accomplished throughtranslational software 318 which converts the probe coordinate system (X2, Y2, Z2) into the scanned image coordinate system (Xo, Yo, Zo) so that the image corresponding to the position ofprobe tip 541 can be generated and displayed. - Referring to
FIG. 5 , a flow chart of the operation oftranslational software 318 is shown as it is used with the apparatus ofFIG. 3B . Initially, the surgeon locatesprobe 542 in the position which is to be determined. (Ifring 306 is not being used to identify the location of the reference plane, the initial step is for the surgeon to use the reference mode of3D digitizer 312 to identify the reference plane by locatingprobe tip 541 at several points in the plane.) The system then initializes at astep 400 so thattranslational software 318 opens a window menu at astep 402 of a multitasking program such as DESQ VIEW distributed by Quarterdeck Office Systems of Santa Monica, Calif. Such software permits simultaneous execution of multiple software programs. In general, once a program is selected for actuation, it continues to run either in the foreground or in the background until deactuated. -
Translational software 318 continues initializing by selectingstereotactic imaging system 324 through stereotacticimage display software 322 and actuatingstereotactic imaging system 324 in the foreground by opening the stereotactic window at astep 404. Thereafter,translational software 318 returns to the window menu at astep 406 moving stereotacticimage display software 322 to the background and selects the digitizer window at astep 408 to actuatedigitizer 312 in the foreground.Computer 314 is then ready to be actuated by the foot switch. - The surgeon then actuates a foot pedal or other switch which indicates that the system should perform a computation. Actuation of the foot switch is essentially the beginning of a
start step 410. Upon actuation, ifsound transducers microphones 350 ofFIG. 3B are being used,digitizer 312 initiates calibration throughtemperature compensation emitter 304 to determine the velocity of the sound waves in the air, energizesemitters 370 ofring 306 to locate the reference plane and energizesemitters 360 ofprobe 302 to locate the position ofprobe tip 301. The signals detected bymicrophone array 300 are digitized so thatSAR program 316 determines the coordinates oftip 301. At astep 412,translational software 318 selects the coordinates fromSAR program 316. - Next, the window menu is again accessed at a
step 414 and the window menu switches stereotacticimage system software 322 to the foreground at astep 416 to specifically control the operation ofstereotactic imaging system 324. At this point,translational software 318 issues an F1 command to stereotacticimage display software 322 which in turn preparesstereotactic imaging system 324 to accept coordinates. At astep 420, the window menu is again selected so that at astep 422computer 314 switches the digitizer window into the foreground. At astep 424, the digitizer window menu is accessed and coordinate translation is selected. At astep 426,digitizer 312 begins calculating the coordinates and at astep 428 the coordinate calculation is ended.Translational software 318 then returns to the digitizer window menu at astep 430, switches windows to place stereotacticimage system software 322 in the foreground at astep 432 to prepare it for receiving the coordinates and again returns to the main window menu at astep 434. Finally, the coordinate information is translated, including any necessary manipulation, and transferred to stereotacticimage display software 322 at astep 436 which actuatesstereotactic imaging system 324 to generate the particular image frommemory 320 and display it on thehigh resolution display 326. Stereotacticimage display software 322 instructsstereotactic imaging system 324 to display a cursor ondisplay 326 at the coordinates which corresponds to the position ofprobe tip 301. Thereafter,computer 314 is in a standby mode until the foot switch of the surgeon is again actuated to executetranslational software 318 beginning with thestart step 410. - The translation that occurs in
step 436 depends on the position of the probe coordinate system relative to the scanned image coordinate system and the units of measure. The systems are preferably coaxial and the units of measure the same so that algebraic adjustment is unnecessary. However, it is contemplated that the coordinates systems may not be coaxial, in which case translation would require arithmetic and/or trigonometric calculations. Also, the sequence, e.g., (X2, Y2, Z2), in which the coordinates are generated by thedigitizer 312 may be different than the sequence, e.g., (Xo, Yo, Zo), in which the stereotacticimage system software 322 receives coordinates. Therefore, the sequence in which the coordinates are transferred may have to be reordered. - Those skilled in the art will recognize that the above computer programming could be accomplished in a number of other ways without departing from the scope of the invention. As one example, and apart from the use of multitasking programs and their associated windows and menus, a personal computer could be directly programmed to calculate the coordinates of the position of
probe tip 301 for use in generating the scan image corresponding to the position oftip 301 from the data stored inmemory 320. - The steps performed by
translational software 318 for the system ofFIG. 4A are similar to those described above for the system ofFIG. 3B with the following exceptions. First, the system ofFIG. 4A does not require a calibration emitter such asemitter 304 inFIG. 3B so that the corresponding step is skipped in the software forFIG. 4A . Further,infrared emitters sound emitters probe tip 541 andbar 548. As above, the various positions of the emitters are determined based on the angle of the view ofdetectors 550 to each ofemitters detectors 550 detects the infrared light. Still further, when theoptical scanner 380 is used,translational software 318 for the system ofFIG. 4A includes additional steps for operatingoptical scanner 380 throughmultiplexer 310 to scan a series of infrared laser beams acrossforehead 390 for detection bydetectors 550. This data is received bydigitizer 312 and passed tocomputer 396 so that the forehead contour can be determined throughsoftware 398. Data identifying the forehead contour is then passed back totranslational software 318 for use as a reference. - Referring to
FIG. 6A , a system of the present invention employing an ultrasound localizer is illustrated. The ultrasound system includes a mechanism such as aMayfield head clamp 570 for maintaininghead 394 in rigid position.Reference bar 548 is rigidly attached to clamp 570 as above withemitters 540 in line of sight witharray 552. The forehead contour is determined by optical scanning usingoptical scanner 380 andarray 552 ofdetectors 550 as shown inFIG. 4A and as more fully described above. The ultrasound system also includes anultrasound probe 500 which may be used in the operating room to scan the brain.Ultrasound probe 500 includes a plurality of at least threenoncolinear emitters 502 which are energized via aline 504 bymultiplexer 310. The signal emitted byemitters 502 is received byarray 552 to determine the position of the body ofultrasound probe 500 relative to the position offorehead 390. This is accomplished throughtranslational software 318 which controlsdigitizer 312 andmultiplexer 310 to energizeemitters 502 in a predetermined sequence to determine the position of the body ofprobe 500. This is the same technique used above inFIGS. 3B and 4A for determining the position ofprobes rings Ultrasound probe 500 is also connected via aline 506 to asystem 508 of known construction which analyzes the ultrasound scanning and provides the analyzed information to amonitor 510 which displays the ultrasound image. Sincearray 552 can determine the position of the body ofultrasound probe 500 at any point in time, viadigitizer 312, the particular plane of the image displayed onmonitor 510 is known. - An ultrasound image is illustrated by way of example in
FIG. 6B . Because the plane of the ultrasound scan image is known, the surgeon can signalstereotactic imaging system 324 to generate a scan image from a different scanning technology ondisplay 326 which corresponds to the ultrasound image.FIG. 6C illustrates such a corresponding image. Alternatively,system 508 may be linked tostereotactic imaging system 324 directly via adata link 515 to communicate the position of the scan plane for the image shown onmonitor 510 so thatstereotactic imaging system 324 can automatically generate and display the corresponding scanned image for a different scanning technology ondisplay 326. As a result, the image from the ultrasound system, as illustrated onmonitor 510, is shown on one monitor and may be compared to a corresponding image obtained from CT, MRI, PET, MEG or some other type of preoperative scanning. The cross section through the three dimensional data set as developed by the ultrasound system is determined by a highspeed graphics system 508, such as manufactured by Silicon Graphics. This allows for better interpretation of the ultrasound scans as the anatomy from the MRI, CT, PET or MEG scans can be seen directly. Furthermore, the ultrasound system allows scanning in the operating room. Since the brain tissue is elastic and the position of various tissue may change from time to time, use of an ultrasound scan in the operating room permits a more definite localization of various brain tissues. For clarity,ultrasound probe 500 is shown inFIG. 6A as spaced away fromhead 394. Usually,ultrasound probe 500 is positioned in contact with the skull during use. The probe may also be affixed to the skull during surgery for continual monitoring of the position of the brain. -
FIG. 7 shows a system of the present invention for correlating the scan images from different scanning technologies. Ascanner 600 represents any of the several scanning technologies currently available (e.g. CT, MRI, PET, MEG) and is intended to include any other scanning technologies that may be developed.Scanner 600 scans head 394 in aplane 602.Plane 602 is usually defined visually by an array of light beams. If the pertinent scanning technology reveals the position of the forehead contour in the scan images, thencomputer 396 employs foreheadfitting software 398 to derive the forehead contour from the scan images.Computer 396 organizes the scan images as a function of the forehead contour for storage inmemory 320. - If the pertinent scanning technology does not reveal the position of the forehead contour in the scan images, then ring 590 is rigidly attached to
head 394. Theoptical scanner 380 is used prior to scanning to relate the position of the forehead contour relative to ring 590 (as described in the text accompanyingFIG. 4A ).Ring 590 lies in aplane 604. During scanning,planes ring 590 coplanar with the visual array of lightbeams defining plane 602. However, it is not necessary to initially alignring 590 coplanar withscan plane 602. As long as the relative relationship in space betweenring 590 andplane 602 is known and that relationship is maintained during the scanning, the orientation of the forehead relative to the scan plane can be calculated. Sincering 590 will appear in at least one scan and since the position of one scan within a group is known with respect to the other scans in the group, the respective positions of the scans relative to ring 590 is known. Since the position of the forehead contour relative to ring 590 was determined by scanning the forehead withscanner 380, the position of the forehead contour relative to the scan images is known.Computer 396 now employs foreheadfitting software 398 to organize the scan images as a function of the forehead contour. This information is databased inmemory 320. The forehead contour is then used to relate the scan images of one technology such as PET to the scan images produced from any other technology such as CT, MRI, or MEG. - When the scan images from several technologies are available, it is contemplated within the scope of the invention to use a like number of displays to display each of the scan images corresponding to the position of the
probe -
FIG. 8 shows alaser depth finder 620 for use in scanning the forehead contour when the line of sight betweenoptical scanner 380 andarray 552 inFIG. 4A is blocked.FIG. 8 includes aMayfield clamp 570 for holdinghead 394 in fixed relation to areference bar 548 havingemitters 545 thereon.Depth finder 620 may be any of the laser based depth finders commonly available which are accurate to within the required tolerances. At least threeemitters 622 are affixed todepth finder 620.Emitters 622 are controlled viamultiplexer 310 so thatcomputer 314 can determine the position ofdepth finder 620 in addition to the position ofbar 548. In operation,depth finder 620 emits an infrared laser beam which is reflected off offorehead 390 and detected by a detector withindepth finder 620. The circuitry insidedepth finder 620 calculates the distance between the illuminated point onforehead 390 and a reference point ondepth finder 620 and outputs a signal corresponding to the calculated distance via aline 624 tocomputer 314.Computer 314 then sequentiallyfires emitters multiplexer 310 to determine the positions ofbar 548 anddepth finder 620. Accordingly, at the end of this first cycle, one point of the forehead contour can be calculated. This cycle is repeated a number of times untilcomputer 314 has obtained sufficient points to map the forehead contour. -
FIGS. 9-11 show an alternative system for registering scan images with the surgical space.FIG. 9 includes acap 700 which fits snugly overhead 394.Cap 700 is secured by anadjustable strap 702. In use, there should be no relative movement betweencap 700 andhead 394. A plurality ofgrommets 704 are sewn intocap 700 at regular intervals.FIG. 10 shows one such grommet in greater detail andFIG. 11 shows the cross-section throughFIG. 10 at the indicated line. As can be seen in these figures,grommets 704 encircle and thereby reinforcefabric 706 ofcap 700. Ahole 707 centrally positioned within eachgrommet 704 is cut intofabric 706 and provides space for supporting amarker 708 and also provides access tounderlying skin 710 onhead 394.Fabric 706 is preferably elastic in nature. Thehole 707 infabric 706 is smaller than the external dimensions ofmarker 708 so thatfabric 706 is stretched slightly to holdmarker 708. For example,hole 707 may be a slit withinfabric 706. -
Markers 708 include an internal reservoir filled with a radiopaque substance which is detected by the scanner during scanning and which appears on the scan images. For example, the markers for CT scanning are filled with omnipaque, the markers for MRI scanning are filled with gadolinium, and the markers for PET scanning are filled with a radioactive tracer. The capacity of the reservoirs inmarkers 708 is different for the different scanning technologies because each scanning technology has a different resolution. However,markers 708 preferably have a uniform external dimension so that thesame cap 700 can be used with any of the different types of scanners and related markers.Markers 708 are easily attached within and removed fromfabric 706 to allow quick access for markingskin 710 underneath. This is also helpful for patients who are undergoing more than one scanning procedure using different scanning technologies. When multiple scanning technologies are used, the markers for the different technologies may be attached tofabric 706 within thesame grommets 704 so that the images produced by the different scanners all showmarkers 708 in the same places.Markers 708 preferably consist of clear plastic material such as polyethylene tubing filled with acontrast medium 710 in the center and sealed at both ends withepoxy 712.Markers 708 can be either prefilled and sealed with suitable contrast medium or fillable by needle puncture with the contrast medium. - For cranial surgery,
cap 700 is preferably made of fabric consisting of 85% Dupont Antron Nylon and 15% Lycra Spandex. Although one size may fit most patients, thecap 700 can be sized or shaped to specific patients. Three-quarter inch grommets 704 are sewn at routine intervals over the entirety of the cap. For surgery on other parts of the body, a flexible material is used which fits snugly like an ace wrap bandage. Again,grommets 704 are sewn every one or two inches. As withcap 700, there is a hole in thefabric 706 in the center of each grommet for holdingmarkers 708. - In use, the patient is instructed to wash his/her hair and to not apply any hair spray, lotion, or other materials prior to scanning in order to provide as oil-free of a surface as is possible. After
cap 700 is snugly fit overhead 394 and secured withchin strap 702, the surgeon selects at least three (preferably more)grommets 704 which will be used to holdmarkers 708. As accuracy of three point registration increases with greater separation of markers,markers 708 are preferably placed over the largest area available to insure a low margin of error. If surgery is planned, hair surrounding the operative area can be clipped or left in place as desired by the surgeon. A small amount of hair is clipped or displaced around the area wheremarkers 708 will be used to allow the positioning ofmarkers 708 close toskin 710.Skin 710 is marked withindelible ink 716 through the holes infabric 706 of thegrommets 704 in which amarker 708 is to be attached.Markers 708 are then attached to said fabric. During this time, the surgeon carefully checks to insure that eachmarker 708 is positioned adjacent to and directly over theink mark 716 onskin 710.Ink mark 716 is preferably positioned in the center of the hole infabric 706. The patient is then positioned on the scanning table andhead 394 is scanned. After scanning,markers 708 are removed. During removal of the markers, the surgeon carefully checks to see that each marker did not move during scanning by checking to see that each is still positioned adjacent to and directly over the correspondingink mark 716. Further, the ink marks should appear in the center of the holes infabric 706. If a marker is no longer in position adjacent the related ink mark and/or if the ink mark is not in the center of the hole, it indicates that movement of the marker has occurred some time during scanning. Accordingly, theparticular ink mark 716 and itscorresponding marker 708 are not used during the subsequent registration process where the scan images are registered with the surgical space. If enough of the markers have moved from their positions so that the position of three of the markers can not be confirmed, then the scan is repeated. - If scanning occurs immediately prior to surgery, the indelible ink marks 716 may need no protection from the possibility of smudging or accidental removal. The patient is issued a paper cap to wear until the time of surgery and is instructed not to remove or interfere with the ink marks. If there will be a delay between scanning and surgery, there are several ways to assure the integrity of the indelible marks. For example, benzoin can be applied to the area surrounding the indelible mark and allowed to dry. A strip of three-quarter inch transparent tape is then applied to the area. Collodium may also be used in a similar way to protect the marks.
- After the integrity of at least three
ink marks 716 has been confirmed, a three point solution utilizing directional cosines from two frames of reference enables the surgeon to register the surgical space with the scan images. If the integrity of more than threemarks 716 is confirmed, the additional marks can be used for redundancy to insure that the registration was properly performed. The registration process can be accomplished using the apparatus shown inFIGS. 4A and 3A . In particular, following scanning withcap 700 andmarkers 708,computer 314 processes and stores the scan images inmemory 320 as a function of themarkers 708 which appear in the scan images using similar techniques as those described above. Prior to surgery,head 394 is clamped inclamp 394. Thetip 541 ofprobe 542 is then touched on each of the ink marks 716 onskin 710 ofhead 394 while theemitters computer 314 now knows the position of each of ink marks 716 relative toreference bar 548, it can determine the position of the scan images relative toreference bar 548. During surgery, as described above,emitters computer 314 to also know the position ofprobe tip 541 relative toreference bar 548. Accordingly,computer 314 knows the position ofprobe tip 541 relative to the scan images.Computer 314 then generates a scan image corresponding to the position oftip 541. The generated image is displayed ondisplay 326. - As can be seen, there are many advantages of using
cap 700 andmarkers 708 to register the scan images to the surgical space. For example, and unlike the placement of reference pins 307 inFIG. 3D , the placement ofmarkers 708 does not cause any pain to the patient. This is becausemarkers 708 are noninvasive and do not require the skin to be broken when they are used. Accordingly, redundant markers are used which provide greater accuracy and which insure in most cases that at least three of the markers will be useable for registering the scan images. Another advantage is that routine scans can be taken withmarkers 708 in place. If the initial scan locates a lesion that requires surgery, the position of the scan images relative tomarkers 708 is known and the same scan images can be used during surgery. Because of the pain involved in implantingreference pins 307, however, they would rarely be used during routine scanning. If a lesion is found during such routine scanning, the entire scan has to be retaken again afterpins 307 are implanted. Yet another advantage of usingmarkers 708 during scanning is that they are removed prior to surgery and so they do not need to be sterilized. Thus, the difficulty otherwise encountered in trying to sterilize such markers is avoided. - For surgery on parts of the body other than the head, a material with
grommets 704 sewn at regular intervals is wrapped once around the part being examined and attached with fasteners that do not distort the image produced. The material is applied snugly, like an ace wrap, with grommets every one to two inches. Alternatively, the fabric can be made into a corset like structure, with the salient feature being reinforcement with grommets that allow holes to be made in the fabric without weakening it, and that also allow placement ofmarkers 708. As withcap 700, the skin is marked withindelible ink 716 under each marker. After scanning,marker 708 is removed and theskin mark 716 is checked to insure that the marker has not moved. - Those skilled in the art will recognize that apparatus other than
cap 700 could be used for positioningmarkers 708 within the scope of the invention. For example,markers 708 can be held in place adjacent anink mark 716 using tape. Such transparent tape has been found to be particularly effective in positioning markers on the forehead and other hairless areas. Further, apparatus other thangrommets 704 andfabric 706 can be used to holdmarkers 708 withincap 700. Such other apparatus includes any of the commonly found fasteners and mechanical fixtures capable of holding relatively small objects. - When introducing elements of the present invention or the preferred embodiments(s) thereof, the articles “a”, “an”, “the” and “said” are intended to mean that there are one or more of the elements. The terms “comprising”, “including” and “having” are intended to be inclusive and mean that there may be additional elements other than the listed elements.
- In view of the above, it will be seen that the several objects of the invention are achieved and other advantageous results attained.
- As various changes could be made in the above constructions without departing from the scope of the invention, it is intended that all matter contained in the above description and shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.
Claims (9)
1. A method for determining a position relative to a body of a patient in a coordinate system, the method comprising:
radiating first signals from a base fixed in relation to the body of the patient, the signals representing the position of the base and the body in the coordinate system;
radiating second signals from an instrument positioned relative to the body, the signals representing the position of the instrument in the coordinate system;
receiving the first and second signals; and
processing the first and second signals to determine the position of the instrument relative to the base and the body in the coordinate system.
2. The method of claim 1 , further including retrieving scanned images of the body; determining the position of the body in the images of the body; and translating the position of the instrument relative to the body in the coordinate system to the position of the instrument relative to the body in the images of the body.
3. The method of claim 2 , further including displaying the position of the instrument relative to the body in the images of the body.
4. A method for indicating a location relative to the body of a patient, the method comprising the steps of:
fixing reference points in relation to the body;
providing body signals from the reference points, the signals representing the position of the reference points and the body;
positioning an instrument relative to the body, the instrument being located remote from the body;
providing instrument signals from the instrument, the signals representing the position of the instrument;
receiving the body and instrument signals; and
determining the position of the instrument relative to the reference points and the body based on the body and instrument signals.
5. The method of claim 4 , further including obtaining a scan image of the body, determining the position of the body in the scan image of the body; and translating the position of the instrument relative to the body to the position of the instrument relative to the body in the scan images of the body.
6. The method of claim 4 , further including displaying the position of the instrument relative to the body.
7. A method for determining a position relative to a body of a patient in a coordinate system, the method comprising:
radiating first signals from the body of the patient, the signals representing the position of the body in the coordinate system;
radiating second signals from an instrument positioned relative to the body, the signals representing the position of the instrument in the coordinate system;
receiving the first and second signals; and
processing the first and second signals to determine the position of the instrument relative to the body in the coordinate system.
8. The method of claim 7 , further including retrieving scanned images of the body; determining the position of the body in the images of the body; and translating the position of the instrument relative to the body in the coordinate system to the position of the instrument relative to the body in the images of the body.
9. The method of claim 8 , further including displaying the position of the instrument relative to the body in the images of the body.
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US10/068,064 Expired - Fee Related US7072704B2 (en) | 1990-10-19 | 2002-02-05 | System for indicating the position of a surgical probe within a head on an image of the head |
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Also Published As
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DE69433588D1 (en) | 2004-04-08 |
EP0699050A4 (en) | 1998-09-16 |
EP0997109B1 (en) | 2003-06-18 |
US6076008A (en) | 2000-06-13 |
DE9422172U1 (en) | 1998-08-06 |
EP0997109A3 (en) | 2000-06-14 |
DE69433588T2 (en) | 2005-02-03 |
US5871445A (en) | 1999-02-16 |
US20020087075A1 (en) | 2002-07-04 |
US5891034A (en) | 1999-04-06 |
WO1994024933A1 (en) | 1994-11-10 |
US6374135B1 (en) | 2002-04-16 |
DE69432834T2 (en) | 2004-05-13 |
CA2161430C (en) | 2001-07-03 |
CA2161430A1 (en) | 1994-11-10 |
AU6818694A (en) | 1994-11-21 |
EP0699050B1 (en) | 2004-03-03 |
EP0699050A1 (en) | 1996-03-06 |
US7072704B2 (en) | 2006-07-04 |
EP0997109A2 (en) | 2000-05-03 |
DE69432834D1 (en) | 2003-07-24 |
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