Boots – shoes – and leggings
Patent
1989-04-21
1991-03-26
Jablon, Clark A.
Boots, shoes, and leggings
25036303, G01T 1161
Patent
active
050034740
ABSTRACT:
A method and an apparatus for performing address transformation of projection data for use in a positron CT system, where plural detectors are classified into plural detector groups. In this system, a polar coordinate of the addresses assigned to paired detectors which detect coincident events of gamma-ray emission is determined by adding a first encoded signal representing a first polar coordinate of the line joining the reference points of the paired detector groups including the paired detectors and a second encoded signal representing a second polar coordinate of the deviation of the line joining the two detectors from the line joining the reference points. The second encoded signal is obtained on the basis of address signals representing the addresses of the two detectors and a third encoded signal representing the angle relationship of the paired detector groups which is preliminarily stored in a memory. The polar coordinate thus obtained is outputted as a fourth encoded signal and used in a image reconstruction process of the positron CT system.
REFERENCES:
Cahoon, J. L. et al., "The Electronics for Donner 600-Crystal Positron Tomograph", IEEE Transactions on Nuclear Science, vol. 33, No. 1, Feb. 1986, 570-575.
Shimizu Keiji
Yamashita Takaji
Hamamatsu Photonics Kabushiki Kaisha
Jablon Clark A.
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