DE2600328A1 - Isodose determination system for X ray computer tomography - has one or more X ray production tubes which can operate at one of several energy levels - Google Patents
Isodose determination system for X ray computer tomography - has one or more X ray production tubes which can operate at one of several energy levelsInfo
- Publication number
- DE2600328A1 DE2600328A1 DE19762600328 DE2600328A DE2600328A1 DE 2600328 A1 DE2600328 A1 DE 2600328A1 DE 19762600328 DE19762600328 DE 19762600328 DE 2600328 A DE2600328 A DE 2600328A DE 2600328 A1 DE2600328 A1 DE 2600328A1
- Authority
- DE
- Germany
- Prior art keywords
- ray
- isodose
- computer tomography
- determination system
- operate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N5/00—Radiation therapy
- A61N5/10—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy
- A61N5/103—Treatment planning systems
Abstract
Description
Zusatzanmeldung zum angemeldeten Patent vom 18. 10. 1974Additional application to the pending patent dated October 18, 1974
Nr. 24 49 751. 6 und zum 1. Zusatzpatent zum vorstehend angemeldeten Patent vom 18. 11. 1975.No. 24 49 751. 6 and to the 1st additional patent to the one applied for above Patent dated November 18, 1975.
Neuer Titel: "Verbesserte Isodosenbestimmung durch Röntgen-Computer-T omographie mit einer Röntgenröhre allein bei zwei oder mehreren unterschiedlichen Photonenenergien.New title: "Improved isodose determination by means of X-ray computer T omography with an X-ray tube alone for two or more different ones Photon energies.
In der vorausgegangenen Zusatzanmeldung zum Hauptpatent ist der wesentlich neue Gesichtspunkt zur Gewinnung von Verteilungsmustern der für die Strahlentherapie maßgebenden Gamma-Absorptionskoeffizienten eine zweite Photonenquelle, die neben der konventionellen Röntgenröhre verwendet wird, bei wesentlich höherer Quantenenergie einzusetzen. Als solche war als Beispiel eine Co-60-Gammastrahlenquelle genannt, weil sie einerseits quantenenergetisch günstige Eigenschaften besitzt und andererseits gerade die heute viel benutzte Therapiequelle ist.In the previous additional application to the main patent, this is essential new point of view for obtaining distribution patterns for radiation therapy governing gamma absorption coefficient a second photon source, which in addition to the conventional X-ray tube is used, with significantly higher quantum energy to use. As such, a Co-60 gamma ray source was named as an example, because on the one hand it has favorable properties in terms of quantum energy and on the other hand is precisely the therapy source that is widely used today.
Gegen dieses Verfahren ließe sich der Einwand erheben, daß das Nebeneinander einer Röntgenquelle mit Hochspannungsbetrieb und einer radioaktiven Strahlenquelle mit entsprechender Abschirmungtevtl.The objection to this procedure could be raised that the coexistence an X-ray source with high voltage operation and a radioactive radiation source with appropriate shielding
unterschiedlichen Detektoren im gleichen Tomographiegerät eine technisch relativ aufwendige und damit auch kostspielige Einrichtung darstellt.different detectors in the same tomography device one technically represents a relatively complex and thus also expensive facility.
Aus diesem Grunde wird zur Vereinfachung der patientengerechten Isodosenbestimmung mit der gleichen Zielsetzung wie im Zusatzpatent erfindungsgemäß vorgeschlagen mit einer oder mehreren geeigneten Röntgenröhren bei 2 oder mehreren effektiv unterschiedlichen Quanten energien die Verteilungsmuster der Röntgenabs orpt ionskoeffizienten desselben Körperquerschnitts zu bestimmen. Dabei müssen die Quantenenergien soweit verschieden sein, da13 sich die örtlich korrespondierenden Absorptionskoeffizienten außerhalb ihrer natürlichen und meßtechnisch bedingten Schwankungsbreiten unterscheiden.For this reason, to simplify the isodose determination appropriate for the patient with the same objective as proposed according to the invention in the additional patent one or more suitable X-ray tubes with 2 or more effectively different ones Quantum energies are the distribution patterns of the X-ray absorption coefficients of the same To determine body cross-section. The quantum energies must be so different that the locally corresponding absorption coefficients are outside their natural and measurement-related fluctuation ranges differentiate.
Die dem Photoeffekt und dem Comtoneffekt zukommenden Anteile im lokalen Absorptionskoeffizienten eines Körperquerschnitts müssen in diesem Falle freilich in komplizierterer Weise ermittelt werden, als dies beim vorausgegangenen 1. Zusatzpatent möglich ist, weil bei diesem durch den Fortfall des Photoeffekts oberhalb von etwa 1 MeV Quantenenergie besonders einfache Verhältnisse vorliegen. Diese Erschwerung des Auswerte- und Berechnungsverfahrens kann aber in Kauf genommen werden, da eine sinngemäße Übertragung des im 1. Zusatzpatent angewendeten Auswerteverfahrens auf die neue Methode mathematisch leicht formulierbar ist und die zugehörige Rechenarbeit vom Computer geleistet wird. Dafür spart man den Einbau der zweiten Strahlenquelle mit einem Radionuklid ein.The proportions of the photo effect and the comton effect in the local In this case, of course, absorption coefficients of a body cross-section must be determined in a more complicated way than in the previous 1st additional patent is possible because in this case, due to the elimination of the photo effect, above about 1 MeV quantum energy, particularly simple relationships exist. This aggravation of the evaluation and calculation process can be accepted because a analogous transfer of the evaluation method used in the 1st additional patent to the new method is easy to formulate mathematically and the associated arithmetic work is done by the computer. In return, the installation of the second radiation source is saved with a radionuclide.
Werden mehr als zwei Quantenenergien (z. B. 80, 160 und 240 keV effektiver Photonenenergie) verwendet, so steigt natürlich der Informationsinhalt über die lokale Elektronendichte und die korrespondierende örtliche stoffliche Zusammensetzung des Gewebes hinsichtlich der beteiligten Elemente.Are more than two quantum energies (e.g. 80, 160 and 240 keV more effective Photon energy), the information content naturally rises above the local electron density and the corresponding local material composition of the fabric in terms of the elements involved.
Da solche Isodosenbestimmungen nur bei Bestrahlungspatienten infrage kommen, ist die Anwendung von mehr als zwei Tomographien im gleichen Körperquerschnitt strahlenbelastungsmäßig ohne Relevanz.Since such isodose determinations are only in question for radiation patients is the use of more than two tomographies in the same cross-section of the body Irrelevant in terms of radiation exposure.
Claims (1)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19762600328 DE2600328A1 (en) | 1974-10-19 | 1976-01-07 | Isodose determination system for X ray computer tomography - has one or more X ray production tubes which can operate at one of several energy levels |
DE19762636562 DE2636562A1 (en) | 1974-10-19 | 1976-08-13 | Therapeutic or diagnostic isodose analysis - using tomography appts. with single X=ray tube and scintillators or multipliers for energy detection |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19742449751 DE2449751A1 (en) | 1974-10-19 | 1974-10-19 | Isodose curve determination for therapeutic tissue irradiation for gamma electron or X-rays involves X-ray analyser computations using cross section |
DE19752552018 DE2552018A1 (en) | 1974-10-19 | 1975-11-20 | Equal dose determination by X:ray computer tomograph - using alternative gamma source for directly determining gamma absorption |
DE19762600328 DE2600328A1 (en) | 1974-10-19 | 1976-01-07 | Isodose determination system for X ray computer tomography - has one or more X ray production tubes which can operate at one of several energy levels |
Publications (1)
Publication Number | Publication Date |
---|---|
DE2600328A1 true DE2600328A1 (en) | 1977-07-21 |
Family
ID=27186130
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19762600328 Withdrawn DE2600328A1 (en) | 1974-10-19 | 1976-01-07 | Isodose determination system for X ray computer tomography - has one or more X ray production tubes which can operate at one of several energy levels |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE2600328A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0198257A3 (en) * | 1985-03-19 | 1989-03-08 | Randell L. Mills | Method and apparatus for selective irradiation of biologmethod and apparatus for selective irradiation of biological materials ical materials |
US5227969A (en) * | 1988-08-01 | 1993-07-13 | W. L. Systems, Inc. | Manipulable three-dimensional projection imaging method |
-
1976
- 1976-01-07 DE DE19762600328 patent/DE2600328A1/en not_active Withdrawn
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0198257A3 (en) * | 1985-03-19 | 1989-03-08 | Randell L. Mills | Method and apparatus for selective irradiation of biologmethod and apparatus for selective irradiation of biological materials ical materials |
US5227969A (en) * | 1988-08-01 | 1993-07-13 | W. L. Systems, Inc. | Manipulable three-dimensional projection imaging method |
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Legal Events
Date | Code | Title | Description |
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8130 | Withdrawal |