CA2217603A1 - Reconstruction system and methods for impedance imaging - Google Patents

Reconstruction system and methods for impedance imaging

Info

Publication number
CA2217603A1
CA2217603A1 CA002217603A CA2217603A CA2217603A1 CA 2217603 A1 CA2217603 A1 CA 2217603A1 CA 002217603 A CA002217603 A CA 002217603A CA 2217603 A CA2217603 A CA 2217603A CA 2217603 A1 CA2217603 A1 CA 2217603A1
Authority
CA
Canada
Prior art keywords
medium
values
region
locations
voltages
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.)
Granted
Application number
CA002217603A
Other languages
French (fr)
Other versions
CA2217603C (en
Inventor
Alvin Wexler
Zhen Mu
Guye S. Strobel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
QUANTIC ELECTROSCAN Inc
Tasc Ltd
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to CA002217603A priority Critical patent/CA2217603C/en
Priority to US08/943,131 priority patent/US6201990B1/en
Publication of CA2217603A1 publication Critical patent/CA2217603A1/en
Application granted granted Critical
Publication of CA2217603C publication Critical patent/CA2217603C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves 
    • A61B5/053—Measuring electrical impedance or conductance of a portion of the body
    • A61B5/0536—Impedance imaging, e.g. by tomography

Abstract

A method of imaging an object contained in a medium, having a specific impedance which is different from the specific impedance of the medium, comprising applying current to the medium at various locations at a surface of the medium, extracting current at other locations, detecting voltages produced by the current which has passed through the medium from the surface of the medium at various other locations, successively determining a location and shape and conductivity of the object with increasing accuracy by processing values of the detected voltages, determining a region in the medium in which the object is located from values of the detected voltages which are within upper and lower threshold values, applying acceleration procedures to the conductivities within the region in the course of iterative refinement of these values in the course of an imaging procedure, subsequently restricting further determination of the location of the object with increasing accuracy to voltages obtained from the region of the medium in which the object is located, and displaying an image on an axis using the restricted location determination values.
CA002217603A 1997-10-02 1997-10-02 Reconstruction system and methods for impedance imaging Expired - Fee Related CA2217603C (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CA002217603A CA2217603C (en) 1997-10-02 1997-10-02 Reconstruction system and methods for impedance imaging
US08/943,131 US6201990B1 (en) 1997-10-02 1997-10-03 Electrical impedance tomography method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA002217603A CA2217603C (en) 1997-10-02 1997-10-02 Reconstruction system and methods for impedance imaging

Publications (2)

Publication Number Publication Date
CA2217603A1 true CA2217603A1 (en) 1999-04-02
CA2217603C CA2217603C (en) 2003-12-23

Family

ID=4161593

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002217603A Expired - Fee Related CA2217603C (en) 1997-10-02 1997-10-02 Reconstruction system and methods for impedance imaging

Country Status (2)

Country Link
US (1) US6201990B1 (en)
CA (1) CA2217603C (en)

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3768101B2 (en) * 1998-10-21 2006-04-19 オムロン株式会社 Landmine detection device and inspection device
US6594521B2 (en) * 1999-12-17 2003-07-15 Electrical Geodesics, Inc. Method for localizing electrical activity in the body
JP2001212098A (en) * 2000-01-31 2001-08-07 Tanita Corp Equipment for measuring bioelectric impedance whose circuit is integrated into one chip
US7499745B2 (en) * 2000-02-28 2009-03-03 Barbara Ann Karmanos Cancer Institute Multidimensional bioelectrical tissue analyzer
US6725087B1 (en) * 2000-09-19 2004-04-20 Telectroscan, Inc. Method and apparatus for remote imaging of biological tissue by electrical impedance tomography through a communications network
CA2363821A1 (en) * 2000-11-24 2002-05-24 Alvin Wexler High definition electrical impedance tomography methods for the detection and diagnosis of early stages of breast cancer
US6460413B1 (en) * 2001-03-15 2002-10-08 Gerald J. Diebold Imaging based on the electroacoustic effect
NO20020780D0 (en) * 2002-02-15 2002-02-15 Amersham Health As Image Analysis
AU2003286457A1 (en) * 2002-10-17 2004-05-04 The General Hospital Corporation Arrangement and method for detecting abnormalities and inconsistencies in a body
US7627362B2 (en) * 2002-11-07 2009-12-01 Wisys Technology Foundation Method and apparatus for producing an electrical property image of substantially homogeneous objects containing inhomogeneities
US20080064981A1 (en) * 2002-11-07 2008-03-13 Christopher Gregory Method and apparatus for determining electrical properties of objects containing inhomogeneities
DE10309245A1 (en) * 2003-03-03 2004-09-16 Siemens Ag Location system of a limited central lesion, especially in breast tissue, an electrical excitation signal is applied to the tissue and response signals are reconstructed to give the location/extension/depth of the lesion
US7664302B2 (en) * 2003-07-18 2010-02-16 Hologic, Inc. Simultaneous grayscale and geometric registration of images
US7603158B2 (en) * 2003-09-04 2009-10-13 Adrian Nachman Current density impedance imaging (CDII)
GB2454925A (en) * 2007-11-26 2009-05-27 Alistair Mcewan Code Division Multiplexed Electrical Impedance Tomography
US8917199B2 (en) 2011-04-13 2014-12-23 Raytheon Company Subterranean image generating device and associated method
TWI442905B (en) * 2011-09-30 2014-07-01 Univ Nat Chiao Tung Apparatus for locating the target of the stimulation
CN103340625B (en) * 2013-06-18 2015-06-17 中国人民解放军第四军医大学 Regularization method of fast optimization in electrical impedance tomography
GB2521207A (en) * 2013-12-13 2015-06-17 Univ Cape Town Imaging an internal volume of a subject body

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5272624A (en) * 1990-10-02 1993-12-21 Rensselaer Polytechnic Institute Current patterns for impedance tomography
US5284142A (en) * 1991-12-16 1994-02-08 Rensselaer Polytechnic Institute Three-dimensional impedance imaging processes
US5544662A (en) * 1991-07-09 1996-08-13 Rensselaer Polytechnic Institute High-speed electric tomography
GB9116215D0 (en) * 1991-07-26 1991-09-11 Nat Res Dev Electrical impedance tomography
GB9226376D0 (en) * 1992-12-18 1993-02-10 British Tech Group Tomography
JP3759606B2 (en) * 1994-03-11 2006-03-29 ビーティージー・インターナショナル・リミテッド Electrical impedance tomography
US5919142A (en) * 1995-06-22 1999-07-06 Btg International Limited Electrical impedance tomography method and apparatus

Also Published As

Publication number Publication date
US6201990B1 (en) 2001-03-13
CA2217603C (en) 2003-12-23

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed

Effective date: 20131002