Gamma camera system with improved means for correcting nonunifor

Details Gamma camera system with improved means for correcting nonunifor Gamma camera system with improved means for correcting nonunifor

1978-04-13

1979-12-18

Willis, Davis L.

Radiant energy

Invisible radiant energy responsive electric signalling

With or including a luminophor

364414, G01T 120

Patent

active

041796071

ABSTRACT:
In a gamma camera system, means are provided for correcting nonuniformity or lack of correspondence between the positions of scintillations and their calculated and displayed x-y coordinates. In an accumulation mode, pulse counts corresponding with scintillations in various areas of the radiation field are stored in memory locations corresponding with their locations in the radiation field. A uniform radiation source is presented to the detectors during the accumulation mode. When a predetermined maximum number of counts is reached in several memory locations, accumulation is interrupted at which time other locations have fewer counts in them. In the run mode, counts are stored in corresponding locations of a memory and these counts are compared continuously with those stored in the accumulation mode. Means are provided for injecting a number of counts during the run mode proportional to the difference between the counts accumulated during the accumulation mode in a given area increment and the counts that should have been obtained from a uniform source.

REFERENCES:
patent: Re28451 (1975-06-01), Spleha et al.
patent: 3878373 (1975-04-01), Blum

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