Scintillation camera uniformity correction

Details Scintillation camera uniformity correction Scintillation camera uniformity correction

G - Physics

01

T

358/11.05

G01T 1/208 (2006.01) G01T 1/164 (2006.01)

Patent

CA 1138131

Scintillation Camera Uniformity Correction Abstract A two-stage system (u) for enhancing imaging uniformity of a nuclear scintillation camera. The system compensates for imprecision in the camera's indication of both radiation event regional image count density and event energy level. A first stage (30, 32) locates and stores a representation of the respective peaks of the detected energy pulse height distribution for each of a plurality of regions in a camera's field of view. This repre- sentation is used to successively realign for each count the pulse height energy window, to align the window over the respective energy peak for each count as a function of the count's location in the field. A second flood correction stage (40, 42, 44) produces and stores a profile of regional variation in image count density indicated by the camera in response to a uniform radiation flood field. The stored information is used for calculating regional count density correction factors for different regions of the camera field. The correction factors are applied for controlling the ratio of radiation counts corresponding to each region which are actually imaged.

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