Radiant energy – Invisible radiant energy responsive electric signalling – With or including a luminophor
Patent
1994-06-08
1996-07-02
Hannaher, Constantine
Radiant energy
Invisible radiant energy responsive electric signalling
With or including a luminophor
G01T 117
Patent
active
055324894
ABSTRACT:
Two .gamma.-rays accompanying position annihilation are incident into .gamma.-ray detectors in detector arrays set with a measured object inbetween. Electric pulse signals output from the .gamma.-ray detectors are supplied to an annihilation presuming unit, which obtains a presumable event of positron annihilation by the coincidence counting conditions and which notifies an image reconstructing unit of annihilation occurrence notification and information of detectors. Electric pulse signals output from the .gamma.-ray detectors are supplied to a time-of-flight difference measuring unit, which measures a difference of detection time between the detectors and notifies the image reconstructing unit of it. The image reconstructing unit obtains a presumable annihilation position based on the received information and stores it. A tomographic image of a specific portion is obtained by an algorithm for substantially compensating measurement errors, for example by the iterative process with the stored information.
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patent: 5285073 (1994-02-01), Schelten et al.
Yamamoto et al., Time-of-Flight Positron Imaging and the Resolution Improvement by an Interactive Method, IEEE Transactions of Nuclear Science, 1989, vol. 36, No. 1, pp. 998-1002.
Tanaka Eiichi
Yamashita Takaji
Hamamatsu Photonics K.K.
Hannaher Constantine
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