US3897345A - High strength low attenuation couch top - Google Patents

High strength low attenuation couch top Download PDF

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Publication number
US3897345A
US3897345A US39834873A US3897345A US 3897345 A US3897345 A US 3897345A US 39834873 A US39834873 A US 39834873A US 3897345 A US3897345 A US 3897345A
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Prior art keywords
stretcher
rays
skin
diagnostic
ray
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Expired - Lifetime
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Melvin Lewis Foster
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THERATRONICS INTERNATIONAL Ltd PO BOX 13140 413 MARCH ROAD KANATA ONTARIO CANADA K2K 2B7 A CORP OF CANADA
CA ATOMIC ENERGY Ltd
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CA ATOMIC ENERGY Ltd
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Priority to CA177,017A priority Critical patent/CA985433A/en
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Assigned to THERATRONICS INTERNATIONAL LIMITED, P.O. BOX 13140, 413 MARCH ROAD, KANATA, ONTARIO, CANADA K2K 2B7, A CORP. OF CANADA reassignment THERATRONICS INTERNATIONAL LIMITED, P.O. BOX 13140, 413 MARCH ROAD, KANATA, ONTARIO, CANADA K2K 2B7, A CORP. OF CANADA ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: ATOMIC ENERGY OF CANADA LIMITED
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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
    • A61B6/04Positioning of patients; Tiltable beds or the like
    • A61B6/0407Tables or beds
    • A61B6/0442Tables or beds made from non-metallic materials

Abstract

In the diagnosis of tumours and the like, particularly by means of X-ray radiographs and the gamma therapy of such afflicted patients'' difficulties have been encountered with prior known stretchers due to the excessive attenuation of the X-rays and the gamma ray because no suitable structural material of low cost has been discovered. Beryllium sheet, wood and plastic sheet are all suitable, but beryllium is costly; wood and plastic structures of sufficient transparency tend to deflect excessively. These prior difficulties have been further magnified when the X-ray beam has been projected obliquely to the plane of the stretcher. The present invention provides a relatively low cost structure having a greatly enhanced strength to weight ratio and a lower transparency to X-rays. The latter feature resulting in lower radiation dose to the patient than previously possible.

Description

United States Patent [1 1 Foster July 29, 1975 [75] Inventor: Melvin Lewis Foster, Ottawa,

Canada [73] Assignee: Atomic Energy of Canada Limited, Ottawa, Canada [22] Filed: Sept. 18, 1973 [21] App]. No.: 398,348

[30] Foreign Application Priority Data July 20, 1973 Canada 177017 [52] U.S. Cl 250/439; 250/456 [51] Int. Cl. G03b 41/16 [58] Field of Search 250/439, 444, 445, 446, 250/447, 448, 449, 450, 451, 456

[56] References Cited UNITED STATES PATENTS 3,157,787 11/1964 Kcndziorski, Jr. et al 250/481 3,449,570 6/1969 Kok 250/439 Primary Examiner-James W. Lawrence Assistant ExaminerC. E. Church Attorney, Agent, or FirmBrowne, Beveridge, DeGrandi & Kline [57] ABSTRACT In the diagnosis of tumours and the like, particularly by means of X-ray radiographs and the gamma therapy of such afflicted patients difficulties have been encountered with prior known stretchers due to the excessive attenuation of the X-rays and the gamma ray because no suitable structural material of low cost has been discovered. Beryllium sheet, wood and plastic sheet are all suitable, but beryllium is costly; wood and plastic structures of sufficient transparency tend to deflect excessively. These prior difficulties have been further magnified when the X-ray beam has been projected obliquely to the plane of the stretcher. The present invention provides a relatively low cost structure having a greatly enhanced strength to weight ratio and a lower transparency to X-rays. The latter feature resulting in lower radiation dose to the patient than previously possible.

2 Claims, 2 Drawing Figures HIGH STRENGTH LOW ATTENUATION COUCH TOP This invention relates to lightweight structures having low transparency to photons. The invention has particular, but not exclusive, utility when applied to diagnostic and therapy stretchers.

Prior known diagnostic stretchers have been made of a variety of materials, the most sophisticated of which have utilised a glass-fibre reinforced polyester shell around a polyurethane foam core. The attenuation of such stretches to X-rays of about 90 kvp has been found equivalent to about 3mm of aluminum. New regulations require diagnostic and therapy stretchers to have an attenuation not to exceed that obtained with 1mm of aluminum.

The present invention makes use of graphite fibres, alone or in combination with organic fibres in a plastics resin matrix as a skin around a rigid polyurethane foam or other foamed plastics core to provide a sandwich constructed couch suitable for supporting patients for examination on a rotational therapy simulator and yet having a uniform transparency to X-rays in such a manner as to permit examination of the patient by the X-ray passing through the patient and the supporting structure while using reduced doses of X-rays.

It is a feature of one object of the invention to provide a diagnostic or therapy stretcher which has high strength to weight ratio and high flexural rigidity.

It is a feature of another object of the invention to provide a diagnostic or therapy stretcher wherein the structure has a relatively high and uniform transparency to X-rays and gamma rays.

It is a feature of yet another object of the invention to provide a diagnostic or therapy stretcher which is particularly advantageous in enabling a beam of X-rays to be directed to the plane of the stretcher at an oblique angle without presenting a substantial variation in the transmission of X-rays.

In accordance with the aforementioned features the invention in its broadest aspects comprises graphite or carbon fibres alone or in combination with organic fibres disposed in an epoxy matrix to form a skin around and bonded to a rigid polyurethane foam core thereby defining a sandwich construction.

The invention will now be described with reference to the accompanying drawings wherein:

FIG. 1 is an isometric drawing, partially sectioned view of a diagnostic stretcher, and

FIG. 2 is a base for receiving the stretcher shown in FIG. 1.

Referring now to FIG. 1, the diagnostic stretcher is generally indicated at l and comprises an outer skin 10 formed of carbon (graphite) fibres alone or in combination with PRD-49 organic fibres manufactured by Dupont (Trademark). The fibres are formed in an epoxy matrix to form a skin around and bonded to a rigid polyurethane foam core 12 to provide a structure of sufficient thickness to support a patient in a cantilevered position and suitable for examination on a rotational therapy simulator yet possessing a relatively high and uniform transparency to X-rays so as to meet the attenuation requirements of the regulations. Integrally bonded to the bottom surface of tray 10 is a sheetlike rigid tray 13. Tray 13 extends longitudinally over only a minor portion of the stretcher 1 and slidably cooperates with a channel-shaped carrier 14 suitably mounted on the top surface 2" of the support base 2. While forming no part of the present invention, tray 13 may be slidably secured to carrier 14 by a plurality of mushroom head bolt members 15, or any other conventional fastening members. In any event, stretcher l is supported in cantilever fashion by base 2. The improved performance of the stretcher is the result of using highstrength, high-modulus fibres having relatively high transparency to X-rays and gamma rays which permit the using of less material to achieve the desired structural stiffness. As mentioned above, this results in a stretcher having X-ray attenuation less than that obtained by passing X-rays of about kvp through 1 mm of aluminum.

The invention enables the construction of a couch of desirable cross-section (i.e. width, depth and shape) which benefits from three essential properties of fibres, that is, high-strength, high-modulus and high transparency to X-rays. v

The invention further provides for reduced attenuation to X-rays and gamma rays which is achieved by using less material to absorb such X-rays and gamma rays and by using a material which is more transparent to X-rays.

Other embodiments of the invention falling within the terms of the appended claims will occur to those skilled in the art.

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:

l. A diagnostic stretcher, substantially transparent to X-radiation, with an attenuation equivalent to less than 1 mm of aluminum when subject to X-rays of 90 kvp passed normal through the said stretcher, said stretcher comprising:

i. an outer skin of carbon or graphite fibres in epoxy matrix, said skin having a configuration of a long thin and substantially flat board suitable for receiving a patient thereon and for cantilevered mounting on a stand, and

ii. a rigid polyurethane foam core within said skin,

said skin and core being bonded together.

2. A diagnostic stretcher in accordance with claim 1 wherein said outer skin additionally includes organic fibres.

Claims (3)

1. A PROCESS FOR THE PRODUCTION OF AN UNSATURATED ALIPHATIC
1. A DIAGNOSTIC STRETCHER SUBSTANTIALLY TRANSPARENT TO XCARBOXYLIC ACID OR THE GROUP CONSISTING OF ACRYLIC ACID AND RADIATION WITH AN ATTENUATION EQUIVALENT TO LESS THAN 1 MM OF METHACRYLIC ACID WHICH COMPRISES PASSING A MIXTURE OF AIR OR ALUMINUM WHEN SUBJECT TO X-RAYS OF 90 KVP PASSED NORMAL OTHER GAS CONTAINING MOLECULAR OXYGEN, STEAM, AND AN UNSATUTHROUGH THE SAID STRETCHER SAID STRETCHER COMPRISING: RATED ALIPHATIC ALDEHYDE OF THE GROUP CONSISTING OF ACROLEIN FOR I. AN OUTER SKIN OF CARBON OR GRAPHITE FIBRES IN EPOXY MATRIX, THE PRODUCTION OF ACRYLIC ACID, AND METHACROLEIN FOR THE PROSAID SKIN HAVING A CONFIGURATION OF A LONG THIN AND SUBDUCTION OF METHACRYLIC ACID, INTO CONTACT AT A TEMPERATURE STANTIALLY FLAT BOARD SUITABLE FOR RECEIVING A PATIENT BETWEEN 20* AND 350*C AND AT A PRESSURE BETWEEN ATOMTHEREON AND FOR CANTILEVERED MOUNTING ON A STAND AND SPHERIC AND A SUPERATOMOSPHERIC PRESSURE OF 3 ATMOSPHERES II. A RIGID POLYURETHANE FOAM CORE WITHIN SAID SKIN SAID SKIN WITH A CATALYST CONSISTING ESSENTIALLY OF OXIDES OR OXYGENAND CORE BEING BONDED TOGETHER. CONTAINING COMPOUNDS OF THE ELEMENTS ANTIMONY, MOLYBDENUM, VANADIUM, AND TUNGSTEN, SUPPORTED ON A CARRIER MATERIAL, THE ATOMIC RATIOS OF THE ELEMENTS OF THE CATALYST WITH RESPECT TO MOLYBDENUM BEING RESPECTIVELY BETWEN 1 : 12 AND 60 : 12 FOR ANTIMONY, BETWEEN 0.5 : 12 AND 25 : 12 AND 25 : 12 FOR VANADI UM, AND BETWEEN 0.1 : 12 AND 12 : 12 FOR TUNGSTEN, AND SUBSEQUENTLY RECOVERING THE ACRYLIC ACID OR METHACRYLIC ACID FROM THE RESULTING MIXTURE.
2. A diagnostic stretcher in accordance with claim 1 wherein said outer skin additionally includes organic fibres.
US39834873 1973-07-20 1973-09-18 High strength low attenuation couch top Expired - Lifetime US3897345A (en)

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CA177,017A CA985433A (en) 1973-07-20 1973-07-20 High strength low attenuation couch top

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JP (1) JPS5421715B2 (en)
CA (1) CA985433A (en)
DE (1) DE2432525A1 (en)
FR (1) FR2237608B1 (en)

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3947686A (en) * 1974-04-25 1976-03-30 The Babcock & Wilcox Co. Graphite composite X-ray transparent patient support
US4134019A (en) * 1977-06-16 1979-01-09 Hipoint Research, Inc. Object support surface and method for X-ray examination
US4145612A (en) * 1977-08-31 1979-03-20 The Babcock & Wilcox Company X-ray patient support stretcher and method for fabrication
US4146793A (en) * 1972-07-27 1979-03-27 Siemens Ag X-ray devices using epoxy resins strengthened with carbonic fibrous material
US4157474A (en) * 1977-05-16 1979-06-05 Hipoint Research, Inc. X-ray film cassette
US4161831A (en) * 1977-09-28 1979-07-24 Restle Donald J Picture mounting and display
US4163900A (en) * 1977-08-17 1979-08-07 Connecticut Research Institute, Inc. Composite electron microscope grid suitable for energy dispersive X-ray analysis, process for producing the same and other micro-components
US4167674A (en) * 1977-06-16 1979-09-11 Hipoint Research, Inc. Photoreceptor plate cassette for use in automated x-ray image processing systems
EP0017454A1 (en) * 1979-04-02 1980-10-15 Kabushiki Kaisha Toshiba Patient supporting table top in medical examination and therapy apparatus
US4252594A (en) * 1977-08-31 1981-02-24 The Babcock & Wilcox Company X-ray patient support stretcher and method for fabrication
US4262204A (en) * 1979-09-24 1981-04-14 General Electric Company Patient cradle for computerized tomography apparatus
US4698837A (en) * 1985-03-11 1987-10-06 Amatech Corporation Armboard mounting assembly
US4710948A (en) * 1985-12-13 1987-12-01 Atlantic Richfield Company Geologic core holder with composite barrel
US4926457A (en) * 1988-01-29 1990-05-15 Hill-Rom Company, Inc. Radiolucent hospital bed surface
US4956885A (en) * 1988-10-03 1990-09-18 U.S. Philips Corporation Patient support for diagnostic apparatus
US5040546A (en) * 1989-12-21 1991-08-20 Lunar Corporation Patient positioning device and method
US5425068A (en) * 1992-05-05 1995-06-13 Siemens Aktiengesellschaft Medical apparatus support member for carrying a component
EP1174087A3 (en) * 2000-07-21 2003-08-27 Siemens Medical Systems, Inc. Tabletop for radiation therapy and diagnostic imaging
US20050284490A1 (en) * 2004-06-25 2005-12-29 Moyers Michael F Method and device for registration and immobilization
WO2006032637A1 (en) * 2004-09-22 2006-03-30 Siemens Aktiengesellschaft Patient table for a radiation therapy system or radiation diagnosis system
EP1682062A2 (en) * 2003-10-16 2006-07-26 Calypso Medical Technologies, Inc. Patient support systems for use with radiation therapy systems and other applications
US20080042076A1 (en) * 2003-08-12 2008-02-21 Loma Linda University Medical Center Modular patient support system
US7789560B2 (en) 2001-10-30 2010-09-07 Loma Linda University Medical Center Method and device for delivering radiotherapy
US20100310054A1 (en) * 2009-06-08 2010-12-09 Oncolog Medical Qa Ab Table top for radiation therapy
WO2011001174A1 (en) * 2009-06-30 2011-01-06 Omnia (Cs) Limited Table having a central cellular honeycomb structure thermally fused in a sandwich configuration between two fibre-reinforced polypropylene face sheets
US8210899B2 (en) 2006-11-21 2012-07-03 Loma Linda University Medical Center Device and method for immobilizing patients for breast radiation therapy
CN102551774A (en) * 2010-12-20 2012-07-11 Ge医疗系统环球技术有限公司 Belt type bed, computed tomography (CT) equipment and calibration data obtaining method for CT equipment

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1578754A (en) * 1976-03-25 1980-11-12 Emi Ltd Patient positioning and supporting arrangement
JPS565505U (en) * 1979-06-25 1981-01-19
JPS565504U (en) * 1979-06-25 1981-01-19
DE3031841A1 (en) * 1979-08-29 1981-03-19 Fothergill & Harvey Ltd operating table
JPS6320541B2 (en) * 1980-08-01 1988-04-28 Somaaru Kk
JPS5898902U (en) * 1981-12-28 1983-07-05
JPS5987805U (en) * 1982-12-02 1984-06-14
DE8411550U1 (en) * 1984-04-12 1984-06-20 Siemens Ag, 1000 Berlin Und 8000 Muenchen, De
US4893323A (en) * 1988-07-19 1990-01-09 Cook Iii Charles F Combination portable x-ray table and stretcher
DE4214858C1 (en) * 1992-05-05 1994-02-10 Siemens Ag X-ray component support and carrier system including guide rails - has members of fibre reinforced plastics for low weight and rigidity and resistant to oscillations

Citations (2)

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US3157787A (en) * 1962-09-05 1964-11-17 Gen Electric Lightweight rigid radiographic film cassette
US3449570A (en) * 1965-10-22 1969-06-10 Philips Corp X-ray table having a plurality of pairs of slings with oppositely windable members

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JPS5121401B2 (en) * 1972-02-15 1976-07-02
DE2236942B2 (en) * 1972-07-27 1974-12-19 Siemens Ag, 1000 Berlin Und 8000 Muenchen

Patent Citations (2)

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Publication number Priority date Publication date Assignee Title
US3157787A (en) * 1962-09-05 1964-11-17 Gen Electric Lightweight rigid radiographic film cassette
US3449570A (en) * 1965-10-22 1969-06-10 Philips Corp X-ray table having a plurality of pairs of slings with oppositely windable members

Cited By (55)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4146793A (en) * 1972-07-27 1979-03-27 Siemens Ag X-ray devices using epoxy resins strengthened with carbonic fibrous material
US3947686A (en) * 1974-04-25 1976-03-30 The Babcock & Wilcox Co. Graphite composite X-ray transparent patient support
US4157474A (en) * 1977-05-16 1979-06-05 Hipoint Research, Inc. X-ray film cassette
US4134019A (en) * 1977-06-16 1979-01-09 Hipoint Research, Inc. Object support surface and method for X-ray examination
US4167674A (en) * 1977-06-16 1979-09-11 Hipoint Research, Inc. Photoreceptor plate cassette for use in automated x-ray image processing systems
US4163900A (en) * 1977-08-17 1979-08-07 Connecticut Research Institute, Inc. Composite electron microscope grid suitable for energy dispersive X-ray analysis, process for producing the same and other micro-components
US4145612A (en) * 1977-08-31 1979-03-20 The Babcock & Wilcox Company X-ray patient support stretcher and method for fabrication
US4252594A (en) * 1977-08-31 1981-02-24 The Babcock & Wilcox Company X-ray patient support stretcher and method for fabrication
US4161831A (en) * 1977-09-28 1979-07-24 Restle Donald J Picture mounting and display
US4312912A (en) * 1979-04-02 1982-01-26 Tokyo Shibaura Denki Kabushiki Kaisha Patient supporting table top in medical examination and therapy apparatus
EP0017454A1 (en) * 1979-04-02 1980-10-15 Kabushiki Kaisha Toshiba Patient supporting table top in medical examination and therapy apparatus
US4262204A (en) * 1979-09-24 1981-04-14 General Electric Company Patient cradle for computerized tomography apparatus
US4698837A (en) * 1985-03-11 1987-10-06 Amatech Corporation Armboard mounting assembly
US4710948A (en) * 1985-12-13 1987-12-01 Atlantic Richfield Company Geologic core holder with composite barrel
US4926457A (en) * 1988-01-29 1990-05-15 Hill-Rom Company, Inc. Radiolucent hospital bed surface
US4956885A (en) * 1988-10-03 1990-09-18 U.S. Philips Corporation Patient support for diagnostic apparatus
US5040546A (en) * 1989-12-21 1991-08-20 Lunar Corporation Patient positioning device and method
US5425068A (en) * 1992-05-05 1995-06-13 Siemens Aktiengesellschaft Medical apparatus support member for carrying a component
EP1174087A3 (en) * 2000-07-21 2003-08-27 Siemens Medical Systems, Inc. Tabletop for radiation therapy and diagnostic imaging
US6904630B2 (en) 2000-07-21 2005-06-14 Siemens Medical Solutions Usa, Inc. Tabletop for radiation therapy and diagnostic imaging
US8376613B2 (en) 2001-10-30 2013-02-19 Loma Linda University Medical Center Method and device for delivering radiotherapy
US8083408B2 (en) 2001-10-30 2011-12-27 Loma Linda University Medical Center Method and device for delivering radiotherapy
US7789560B2 (en) 2001-10-30 2010-09-07 Loma Linda University Medical Center Method and device for delivering radiotherapy
US8093569B2 (en) 2003-08-12 2012-01-10 Loma Linda University Medical Centre Modular patient support system
US8184773B2 (en) 2003-08-12 2012-05-22 Loma Linda University Medical Center Path planning and collision avoidance for movement of instruments in a radiation therapy environment
US20080042076A1 (en) * 2003-08-12 2008-02-21 Loma Linda University Medical Center Modular patient support system
US20110218679A1 (en) * 2003-08-12 2011-09-08 Loma Linda University Medical Center Path planning and collision avoidance for movement of instruments in a radiation therapy environment
US8269195B2 (en) 2003-08-12 2012-09-18 Loma Linda University Medical Center Patient alignment system with external measurement and object coordination for radiation therapy system
US7949096B2 (en) 2003-08-12 2011-05-24 Loma Linda University Medical Center Path planning and collision avoidance for movement of instruments in a radiation therapy environment
US7746978B2 (en) 2003-08-12 2010-06-29 Loma Linda University Medical Center Path planning and collision avoidance for movement of instruments in a radiation therapy environment
US8569720B2 (en) 2003-08-12 2013-10-29 Loma Linda University Medical Center Patient alignment system with external measurement and object coordination for radiation therapy system
US8981324B2 (en) 2003-08-12 2015-03-17 Loma Linda University Medical Center Patient alignment system with external measurement and object coordination for radiation therapy system
US7696499B2 (en) 2003-08-12 2010-04-13 Loma Linda University Medical Center Modular patient support system
US8418288B2 (en) 2003-08-12 2013-04-16 Loma Linda University Medical Center Modular patient support system
EP1682062A2 (en) * 2003-10-16 2006-07-26 Calypso Medical Technologies, Inc. Patient support systems for use with radiation therapy systems and other applications
US20090211027A1 (en) * 2003-10-16 2009-08-27 Calypso Medical Technologies Inc. Patient Support Systems for Use with Radiation Therapy Systems and Other Applications
EP1682062A4 (en) * 2003-10-16 2009-07-15 Calypso Med Technologies Inc Patient support systems for use with radiation therapy systems and other applications
US8020227B2 (en) * 2003-10-16 2011-09-20 Calypso Medical Technologies, Inc. Patient support systems for use with radiation therapy systems and other applications
US8453281B2 (en) * 2003-10-16 2013-06-04 Varian Medical Systems, Inc. Patient support systems for use with radiation therapy systems and other applications
US7073508B2 (en) 2004-06-25 2006-07-11 Loma Linda University Medical Center Method and device for registration and immobilization
US7984715B2 (en) 2004-06-25 2011-07-26 Loma Linda University Medical Center Method and device for registration and immobilization
US20050284490A1 (en) * 2004-06-25 2005-12-29 Moyers Michael F Method and device for registration and immobilization
US8479743B2 (en) 2004-06-25 2013-07-09 Loma Linda University Medical Center Method and device for registration and immobilization
DE112005002108B4 (en) * 2004-09-22 2017-03-09 Siemens Healthcare Gmbh Patient table for a radiotherapy or radiation diagnostic system
US20080013693A1 (en) * 2004-09-22 2008-01-17 Jochen Kusch Patient Table for a Radiation Therapy System or a Radiation Diagnosis System
US7753587B2 (en) 2004-09-22 2010-07-13 Siemens Aktiengesellschaft Patient table for a radiation therapy system or a radiation diagnosis system
WO2006032637A1 (en) * 2004-09-22 2006-03-30 Siemens Aktiengesellschaft Patient table for a radiation therapy system or radiation diagnosis system
US8210899B2 (en) 2006-11-21 2012-07-03 Loma Linda University Medical Center Device and method for immobilizing patients for breast radiation therapy
US9084886B2 (en) 2006-11-21 2015-07-21 Loma Linda University Medical Center Device and method for immobilizing patients for breast radiation therapy
US8523630B2 (en) 2006-11-21 2013-09-03 Loma Linda University Medical Center Device and method for immobilizing patients for breast radiation therapy
US20100310054A1 (en) * 2009-06-08 2010-12-09 Oncolog Medical Qa Ab Table top for radiation therapy
WO2011001174A1 (en) * 2009-06-30 2011-01-06 Omnia (Cs) Limited Table having a central cellular honeycomb structure thermally fused in a sandwich configuration between two fibre-reinforced polypropylene face sheets
US9131871B2 (en) * 2009-06-30 2015-09-15 Omnia (Cs) Limited Table having a central cellular honeycomb structure thermally fused in a sandwich configuration between two fibre-reinforced polypropylene face sheets
CN102551774A (en) * 2010-12-20 2012-07-11 Ge医疗系统环球技术有限公司 Belt type bed, computed tomography (CT) equipment and calibration data obtaining method for CT equipment
CN102551774B (en) * 2010-12-20 2016-05-11 Ge医疗系统环球技术有限公司 The belt table and devices ct ct method and apparatus for acquiring calibration data

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Publication number Publication date
CA985433A1 (en)
CA985433A (en) 1976-03-09
JPS5421715B2 (en) 1979-08-01
FR2237608A1 (en) 1975-02-14
JPS50152685A (en) 1975-12-08
FR2237608B1 (en) 1978-09-15
DE2432525A1 (en) 1975-02-06

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Owner name: THERATRONICS INTERNATIONAL LIMITED, P.O. BOX 13140

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:ATOMIC ENERGY OF CANADA LIMITED;REEL/FRAME:004991/0249

Effective date: 19880930