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Proceedings Paper

Automatic Field Uniformity Corrections In Scintillation Cameras
Author(s): L.Stephen Graham; Arthur Olch; J.Michael Uszler; F.Eugene Holly
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Paper 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.

Paper Details

Date Published: 15 November 1978
PDF: 5 pages
Proc. SPIE 0152, Recent and Future Developments in Medical Imaging I, (15 November 1978); doi: 10.1117/12.938205
Show Author Affiliations
L.Stephen Graham, Veteran's Administration Hospital and UCLA School of Medicine (United States)
Arthur Olch, UCLA School of Medicine (United States)
J.Michael Uszler, Harbor General Hospital and UCLA School of Medicine (United States)
F.Eugene Holly, UCLA School of Medicine (United States)


Published in SPIE Proceedings Vol. 0152:
Recent and Future Developments in Medical Imaging I
Norman A. Baily, Editor(s)

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