Three-dimensional time-of-flight gamma camera system

Details Three-dimensional time-of-flight gamma camera system Three-dimensional time-of-flight gamma camera system

1975-01-29

1976-08-31

Dixon, Harold A.

Radiant energy

Invisible radiant energy responsive electric signalling

With or including a luminophor

250363R, G01T 120

Patent

active

039783375

ABSTRACT:
A pair of fast acting elongated plastic scintillation bars are arranged in a skewed spatial relationship to thereby define a unique tetrahedron in space which constitutes the positron sensitive volume of the camera. Each scintillation bar is serviced by a pair of fast acting photomultiplier tubes disposed immediately adjacent the ends of the bars, so that four substantially coincident relative times of activation of the photomultipliers occur when the two opposed 511 keV gamma rays, arising from a positron annihilation within the tetrahedron, happen to hit and be stopped by the two scintillation bars, causing scintillations therein.
From measurements and analysis of the various time differences of photomultiplier activations, the location of the respective scintillations along the two bars is defined, thereby defining the gamma ray flight line joining the two scintillations. Measurement and analysis of various time differences of photomultiplier activations then serves to define the point along the gamma ray flight line at which the positron annihilation occurred.
In an enhanced sensitivity version, a plurality (p) of pairs of skewed detectors are arranged so that a plurality of detectors are parallel and closely spaced, and the plurality of detectors with which they are paired are also parallel and closely spaced, effectively forming (p.sup.2) cameras covering (p.sup.2) tetrahedrons, which tetrahedrons may be so closely overlapping as to cover almost identical volumes.

REFERENCES:
patent: 2879398 (1959-03-01), Garrison
patent: 3502873 (1970-03-01), Woronowicz
patent: 3688113 (1972-08-01), Miraldi

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