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Testing of local gamma-ray scatter fractions determined by spectral fitting
Koral, Kenneth F.; Wang, X.; Zasadny, Kenneth R.; Clinthorne, Neal H.; Rogers, W. Leslie; Floyd, C. E. Jr; Jaszczak, R. J.
Koral, Kenneth F.; Wang, X.; Zasadny, Kenneth R.; Clinthorne, Neal H.; Rogers, W. Leslie; Floyd, C. E. Jr; Jaszczak, R. J.
1991-02-01
Citation:Koral, K F; Wang, X; Zasadny, K R; Clinthorne, N H; Rogers, W L; Floyd, C E Jr; Jaszczak, R J (1991). "Testing of local gamma-ray scatter fractions determined by spectral fitting." Physics in Medicine and Biology. 36(2): 177-190. <http://hdl.handle.net/2027.42/48957>
Abstract: The spectral-fitting method of correction for gamma-ray Compton scattering within objects separates the unscattered and scattered components of locally measured energy spectra. Here, the authors employ a third-order polynomial for the scattering and an approximately constant fitting window. A scatter fraction, defined as total scattered over total unscattered counts within a 20% window, is calculated for each point in the Anger camera images. These scatter fractions are tested against those from Monte-Carlo simulation for 99mTc and against results from semiconductor detector measurements for 131I. A radioactive sphere at several locations within a non-radioactive cylinder and the inverse are imaged for the testing. For one case, reproducibility of the spectral-fitting scatter fraction as a function of the number of unscattered counts within the 20% acceptance window was also determined.
