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- W2183443605 abstract "Because of apparent widening of the photo peak in the detection of low-energy gamma rays by sodium iodide crystals, Compton-scattered phantoms are also recorded in the photopeak window setting of the pulse-height analyzer. The resulting degradation of the image obtained can be appreciably reduced. The technique consists of measuring and subtracting the number of events recorded in the Compton energy interval 91â€102 keV from the number of events simul taneously recorded under the photopeak 125†170 key. This relatively simple technique re quires two single-channel analyzers and can be incorporated readily in rectilinear scanners and stationary imaging devices. matically raised to decrease the scaUer contribution; when the counting rate in the scatter region is low, the baseline is lowered to preserve sensitivity. We have investigated another method for reducing the effects of scattered radiation. When scanning a distribution of O9mTc,we set the photopeak window of the spectrometer to record events between 125 and 170 keV. For this setting the counting efficiency for unscattered photons, defined as the number of such pulses within this window setting divided by the number in the entire photopeak, is 0.95 (2). To compensate for the scattered photons recorded in this window setting, we simultaneously count, using another single-channel analyzer, over an energy in terval in the Compton scatter region that contains nearly the same counting rate from Compton-scat tered photons as that in the photopeak. The counts measured in this energy region are then subtracted from the counts measured in the photopeak. We have calculated the energy interval in the Compton re gion where the scatter counting rate is the same as the counting rate due to scatter under the photopeak on the assumption that the Klein-Nishina equation adequately describes the spectrum of scattered pho tons that emerge from the patient. This paper demonstrates the improvement in image contrast that can be obtained using this scatter subtraction technique while at the same time no appreciable loss of sensitivity occurs for counting primary photons." @default.
- W2183443605 created "2016-06-24" @default.
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- W2183443605 date "1972-01-01" @default.
- W2183443605 modified "2023-09-27" @default.
- W2183443605 title "REDUCTION OF THE EFFECTS OF" @default.
- W2183443605 hasPublicationYear "1972" @default.
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