Radiant energy – Invisible radiant energy responsive electric signalling – With or including a luminophor
Patent
1975-07-11
1977-01-04
Dixon, Harold A.
Radiant energy
Invisible radiant energy responsive electric signalling
With or including a luminophor
250366, 250505, G01T 120, G02B 500
Patent
active
040015912
ABSTRACT:
A head for a scintillation camera has a planar scintillating crystal that responds to radiation stimuli by producing light events whose spatial distribution corresponds to the spatial distribution of the radiation stimuli, and a plurality of photomultipliers each having a photocathode facing the crystal and producing an output signal when a light event occurs. The photomultipliers are organized into a first group arranged in a cluster centrally positioned relative to the crystal and having smaller photocathodes than those in the second group which is arranged in an annular array surrounding the first group. The head of the camera is connected to signal processing circuitry for computing each of two spatial coordinates of a light event by forming analytical functions of the output signals. Such circuitry has two selective modes of operation. In the first, each spatial coordinate of a light event is computed by forming an analytic function of the output signals from only those photomultipliers in the first group. In the second mode of operation, each spatial coordinate of the light event is computed using an analytical function of the sum of the output signals of the first group of photomultipliers and the output signals from the second group. For light events falling within a first portion of the crystal defined by the envelope of the projection on the crystal of the photocathodes of the first group of photomultipliers, when the signal processing circuitry is operating in its first mode, the resolution achieved will be much better than the resolution achieved when the signal processing circuitry is operating in its second mode.
REFERENCES:
patent: 3197638 (1965-07-01), Sinclair
Dixon Harold A.
Elscint Ltd.
Sandler Donald M.
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