Development of a Compton camera based on 3D position-sensitive virtual Frisch-grid CZT detectors

被引：6

作者：

Kim, Younghak ^{[1
,2
]}

Lee, Wonho ^{[3
]}

机构：

[1] Korea Univ, Hlth Sci Res Ctr, Seoul 02841, South Korea

[2] Korea Atom Energy Res Inst, Environm Radioact Assessment Team, Daejeon 34057, South Korea

[3] Korea Univ, Sch Hlth & Environm Sci, Seoul 02841, South Korea

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | 2023年 / 1053卷

基金：

新加坡国家研究基金会;

关键词：

3D position sensing; Cadmium-zinc-telluride; Compton imaging; Signal correction; Spectroscopy; Virtual Frisch-grid method; CDZNTE; PERFORMANCE;

D O I：

10.1016/j.nima.2023.168390

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

In this study, a Compton camera was developed utilizing a 2 x 2 array of cadmium-zinc-telluride (CZT) detectors. The camera employs four CZTs, each measuring 6 mm x 6 mm x 19 mm. The virtual Frisch -grid method with a four-segment side pad was applied to ensure accurate 3D position sensing. In addition, rejection and correction methods were developed that leverage positional information to correct for non-uniform detector responses. Various isotopes were measured to evaluate the spectral performance. The energy resolutions were 3.11, 2.36, 2.00, 1.65, 1.31, and 1.50% at 356, 511, 662, 1275, and 1332 keV, respectively. In addition, to estimate depth, a comparison was made between the performance of cathode signal-based and side electrode-based methods, and their interchangeability was confirmed. Additionally, Compton imaging experiments were performed for single and multiple sources at various positions, and an iterative method was implemented for image reconstruction. Although the imaging performance varied depending on the gamma-ray direction, our system was able to accurately reconstruct the positions of single or multiple sources. The intrinsic efficiency, spatial resolution, and positional error were determined to be (1.43 & PLUSMN; 0.36) x 10-3, 16.42 degrees & PLUSMN; 7.02 degrees, and 3.43 degrees & PLUSMN; 1.62 degrees, respectively.

引用

页数：16

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