Automatic Field Uniformity Corrections In Scintillation Cameras

L.Stephen Graham; Arthur Olch; J.Michael Uszler; F.Eugene Holly

doi:10.1117/12.938205

15 November 1978 Automatic Field Uniformity Corrections In Scintillation Cameras

L.Stephen Graham, Arthur Olch, J.Michael Uszler, F.Eugene Holly

Proceedings Volume 0152, Recent and Future Developments in Medical Imaging I; (1978) https://doi.org/10.1117/12.938205
Event: 22nd Annual Technical Symposium, 1978, San Diego, United States

Abstract

Most Anger scintillation cameras are now fitted with mircoprocessors for live correction of field non-uniformities. The purpose of this work was to evaluate the corrected flood field uniformity under conditions simulating clinical usage. Uniformity was eval-uated by computing the location and percentage of cells in a 64 x 64 matrix that were within + 5% of the mean cell count. When reference floods were stored at high data input rates, corrected floods measured at low rates showed a 10% decrease in the number of cells within + 5%. From 3 to 17% more time was required to generate corrected images. The addition of as much as 10.2 cm of scatter medium during the correction process caused the number of cells to decrease by 1.5%. Change of collimator type after storage of the reference flood caused as much as a 10% decrease in the number of cells falling within +5%. Changes in analyzer window size and location also produced significant decreases in the number of cells falling within the prescribed limits.

Citation Download Citation

L.Stephen Graham, Arthur Olch, J.Michael Uszler, and F.Eugene Holly "Automatic Field Uniformity Corrections In Scintillation Cameras", Proc. SPIE 0152, Recent and Future Developments in Medical Imaging I, (15 November 1978); https://doi.org/10.1117/12.938205

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