Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
  • H01J43/00—Secondary-emission tubes; Electron-multiplier tubes
  • H01J43/04—Electron multipliers
  • H01J43/30—Circuit arrangements not adapted to a particular application of the tube and not otherwise provided for
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
  • G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
  • G01T1/16—Measuring radiation intensity
  • G01T1/161—Applications in the field of nuclear medicine, e.g. in vivo counting
  • G01T1/164—Scintigraphy
  • G01T1/1641—Static instruments for imaging the distribution of radioactivity in one or two dimensions using one or several scintillating elements; Radio-isotope cameras
  • G01T1/1642—Static instruments for imaging the distribution of radioactivity in one or two dimensions using one or several scintillating elements; Radio-isotope cameras using a scintillation crystal and position sensing photodetector arrays, e.g. ANGER cameras
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
  • G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
  • G01T1/16—Measuring radiation intensity
  • G01T1/20—Measuring radiation intensity with scintillation detectors
  • G01T1/208—Circuits specially adapted for scintillation detectors, e.g. for the photo-multiplier section

Definitions

• Fig. 4 is a block diagram of a coincidence Anger Camera utilizing two of the Anger detectors of Fig. 3;
• Fig. 2A all of the electronics shown in Fig. 2A is preferably placed on a PC board which is attached to the PMT. After adjustment of potentiometer 40 and variable resistor 44 to set the gain and transit time of the PMT, as described below, the PMT is ready for installation in a gamma camera.
• the cathode-grid resistance is a variable resistor 53 and a fixed resistor 55 connects grid 14 to first dynode 16.
• a resistor 54 having a resistance that is much smaller than the sum of the resistances of resistors 53 and 55 connects cathode 12 and first dynode 16. The presence of resistor 54 fixes, to great measure, the voltage
• each PMT includes circuitry shown in one or more of Figs. 2A-2D and has been adjusted and calibrated as described above.
• the outputs of the PMTs are summed (after amplification and optionally partial integration) in a summer 76.
• the output of summer 76 contains information on the time of occurrence of an interaction of a gamma ray with crystal 72 and on the energy of the gamma ray. This information is used to trigger an event detector 80 which sends a timing signal to Anger electronics 78 and to a coincidence unit 90 as described below.
• Anger electronics 78 produces, responsive to the output of the PMTs, a position signal and an energy signal as well as other signal as is well known in the art.
• Anger Processor 98 If a valid coincidence signal is generated, the information from the detectors is fed to an Anger Processor 98.
• Anger processors are well known in the art and this unit as well as a host computer, display, user interface and storage may be any design and construction as known in the art.
• any overall differences in time delay of the two detectors and the time delay of cables, electronics and other components may be compensated for by adjusting the delay of delay circuit 100.

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• Physics & Mathematics (AREA)
• Health & Medical Sciences (AREA)
• Life Sciences & Earth Sciences (AREA)
• General Physics & Mathematics (AREA)
• High Energy & Nuclear Physics (AREA)
• Molecular Biology (AREA)
• Spectroscopy & Molecular Physics (AREA)
• Engineering & Computer Science (AREA)
• Biomedical Technology (AREA)
• General Health & Medical Sciences (AREA)
• Medical Informatics (AREA)
• Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
• Optics & Photonics (AREA)
• Nuclear Medicine (AREA)

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• 1998
  • 1998-03-25 IL IL12382498A patent/IL123824A0/xx unknown
  • 1998-07-08 EP EP98931005A patent/EP1066648A1/de not_active Ceased
  • 1998-07-08 WO PCT/IL1998/000320 patent/WO1999049494A1/en not_active Application Discontinuation
  • 1998-07-08 JP JP2000538371A patent/JP2002508505A/ja active Pending

Non-Patent Citations (1)

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