Scintillation camera compensation for shifting the center channe

Details Scintillation camera compensation for shifting the center channe Scintillation camera compensation for shifting the center channe

1986-08-20

1989-09-12

Smith, Jerry

Boots, shoes, and leggings

36457104, 2502521, 250369, 25036307, 378207, G01T 1208, G01T 1164

Patent

active

048666157

ABSTRACT:
A scintillation camera apparatus includes a scintillation camera which generates X and Y position signals representing a detection position of gamma rays radiated from an object to be examined and a Z signal representing the energy level of the gamma rays, and an image memory for storing data indicating the detection frequency of the Z signal having an energy exceeding a predetermined level at a location accessed by the X and Y position signals. A first compensation table for compensating for the nonlinearity of the X and Y position signals and a second compensation table for the Z signal are provided for compensating for the X, Y, and Z signals to be supplied to the image memory. For compensating a change with time in gains of the photomultipliers, a data memory is provided for storing an energy spectrum of gamma rays in a real time manner. The peak valve position of the energy spectrum is calculated based on the data stored in the data memory. If the peak valve position changes, the content of the second compensation table is rewritten in accordance with the shifting of the peak valve position of the energy spectrum.

REFERENCES:
patent: 4047034 (1977-09-01), Auphan
patent: 4223221 (1980-09-01), Gambini et al.
patent: 4323977 (1982-04-01), Arseneau
patent: 4517460 (1985-05-01), Meulenbrugge et al.
patent: 4577338 (1986-03-01), Takahashi et al.
patent: 4583187 (1986-04-01), Stoub
patent: 4611283 (1986-09-01), Lumelsky et al.

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