A Monte Carlo study of the acceptance to scattered events in a depth encoding PET camera

被引：5

作者：

Moisan, C ^{[1
]}

Tupper, P ^{[1
]}

Rogers, JG ^{[1
]}

deJong, JK ^{[1
]}

机构：

[1] TRIUMF,VANCOUVER,BC V6T 2A3,CANADA

来源：

IEEE TRANSACTIONS ON NUCLEAR SCIENCE | 1996年 / 43卷 / 03期

基金：

加拿大自然科学与工程研究理事会;

关键词：

D O I：

10.1109/23.507256

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

We present a Monte Carlo study of the acceptance to scattered events in a Depth Encoding Large Aperture Camera (DELAC), a hypothetical PET scanner with the capacity to encode the depth-of-interaction (DOI) of incident gamma-rays. The simulation is initially validated against the measured energy resolution and scatter fraction of the ECAT-953B scanner. It is then used to assess the response to scattered events in a PET camera made of position encoding blocks of the EXACT HR PLUS type, modified to have DOI resolution through a variation in the photopeak pulse height. The detection efficiency for 511 keV gamma-rays, as well as for those that scattered in the object or left only part of their energy in the block, is studied for several combinations of DOI sensitivities and block thicknesses. The scatter fraction predicted by the simulation for DELACs of various ring radii is compared to that of the ECAT-953B as a function of the energy threshold. The results indicate that the poorer discrimination of object scatters with depth sensitive blocks does not lead to a dramatic increase of the scatter fraction.

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页码：1974 / 1980

页数：7

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