High-speed pulse discriminating gamma ray camera

Radiant energy – Invisible radiant energy responsive electric signalling – With or including a luminophor

Reexamination Certificate

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C250S366000

Reexamination Certificate

active

06927396

ABSTRACT:
A gamma ray camera A includes a crystal array S which includes a plurality of pixels4each of which outputs a pixel signal in response to receiving a gamma ray. A first circuit (6, 8, 10, 12, 14and22) outputs for each pixel4of the crystal array S, when a pixel signal output by the pixel4has a predetermined relation to a reference signal, a threshold signal related to the position of the pixel4in the crystal array S. A second circuit (18, 20, 24, 26, 28, 30and32) outputs a counter value for each pixel signal having a predetermined relation to its threshold signal. Lastly, a third circuit34accumulates for each pixel4of the crystal array S a count of the counter values output by the second circuit (18, 20, 24, 26, 28, 30and32) for the pixel4.

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