Radiant energy – Invisible radiant energy responsive electric signalling – With or including a luminophor
Patent
1989-06-20
1990-12-25
Hannaher, Constantine
Radiant energy
Invisible radiant energy responsive electric signalling
With or including a luminophor
25036302, 25036304, 25036310, 250366, 2505051, G01T 1164, G01T 120
Patent
active
049805525
ABSTRACT:
A greatly reduced number of scintillation cyrstal/PMT gamma ray detectors are employed in a ring array about a PET image volume. Because of the relatively small number of such detectors, the complexity and expense of associated electronic signal processing channels is greatly reduced (even if each such channel is provided with sophisticated time of flight capabilities). Similarly, because relatively fewer crystals are employed, it becomes possible to use much larger and faster response time scintillation crystals so as to greatly increase gamma ray detection efficiency and scatter rejection while also permitting the electronic circuits to better reject random events and to provide effective time of flight image data filtering. By providing successively offset collimation apertures for each successive detector of the ring array and by rotating the array 360 degrees through a large number of successive view angle positions, it is nevertheless possible to acquire extremely high resolution image data with a greatly reduced system cost. A multiple aperture embodiment provides improved sensitivity by using associated light collimators and photodiodes in conjunction with slow coincidence steering circuits.
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Buchsbaum Monte S.
Bunny William E.
Cho Zang-Hee
Friedenberg Richard M.
Wong, Jr. Edward K.
Hannaher Constantine
The Regents of the University of California
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