ASSESSMENT OF RESPONSE FUNCTION IN 2 PET SCANNERS WITH AND WITHOUT INTERPLANE SEPTA

被引：22

作者：

MICHEL, C ^{[1
]}

BOL, A ^{[1
]}

SPINKS, T ^{[1
]}

TOWNSEND, D ^{[1
]}

BAILEY, D ^{[1
]}

GROOTOONK, S ^{[1
]}

JONES, T ^{[1
]}

机构：

[1] HAMMERSMITH HOSP,MRC,CYCLOTRON UNIT,LONDON W12 0HS,ENGLAND

来源：

IEEE TRANSACTIONS ON MEDICAL IMAGING | 1991年 / 10卷 / 03期

关键词：

D O I：

10.1109/42.97571

中图分类号：

TP39 [计算机的应用];

学科分类号：

081203 ; 0835 ;

摘要：

Removal of interplane septa and acquisition of all possible lines of response (LOR's) increase the sensitivity of multiring positron tomographs at the cost of an increase in the scatter fraction (SF) and randoms. We have assessed the response function both experimentally and theoretically for two commercial tomographs: CTI 931/08-12 and CTI 953B with and without interplane septa. Monte-Carlo simulations were undertaken using the GEANT package from CERN. Spatial resolution (tomographic and axial) were calculated for line sources at various positions in the field of view (FOV). Sensitivity and SF were calculated for various source geometries as a function of energy discrimination. A very realistic response function in PET is obtained by Monte-Carlo methods, using global parameters to account for unsimulated phenomena such as scintillation light transport inside a detector block and its sharing amongst the various phototubes. Minor discrepancies remain for sensitivity and SF at high energy threshold and may probably be explained by introducing the observed dispersion in the energy response for the various crystals within a detector block.

引用

页码：240 / 248

页数：9

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