Development and preliminary results of a large-pixel two-layer LaBr<sub>3</sub> Compton camera prototype

Ming-Hao Dong; Zhi-Yang Yao; Yong-Shun Xiao

doi:10.1007/s41365-023-01273-5

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Development and preliminary results of a large-pixel two-layer LaBr₃ Compton camera prototype

NUCLEAR ELECTRONICS AND INSTRUMENTATION | Updated：2023-09-19

- Development and preliminary results of a large-pixel two-layer LaBr₃ Compton camera prototype
- Nuclear Science and Techniques Vol. 34, Issue 8, Article number: 121(2023)
- Affiliations：
  
  1.Department of Engineering Physics, Tsinghua University, Beijing 100084, China
  2.Key Laboratory of Particle & Radiation Imaging (Tsinghua University), Ministry of Education, Beijing 100084, China
- Author bio：
  
  * xiaoysh@mail.tsinghua.edu.cn
- Funds：
- DOI：10.1007/s41365-023-01273-5
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Ming-Hao Dong, Zhi-Yang Yao, Yong-Shun Xiao. Development and preliminary results of a large-pixel two-layer LaBr₃ Compton camera prototype. [J]. Nuclear Science and Techniques 34(8):121(2023)
DOI：

Ming-Hao Dong, Zhi-Yang Yao, Yong-Shun Xiao. Development and preliminary results of a large-pixel two-layer LaBr₃ Compton camera prototype. [J]. Nuclear Science and Techniques 34(8):121(2023) DOI： 10.1007/s41365-023-01273-5.

摘要

Abstract

Lanthanum bromide (LaBr,3,) crystal has a high energy resolution and time resolution and has been used in Compton cameras (CCs) over the past few decades. However, LaBr,3, crystal arrays are difficult to process because LaBr,3, is easy to crack and break; thus, few LaBr,3,-based CC prototypes have been built. In this study, we designed and fabricated a large-pixel LaBr,3, CC prototype and evaluated its performance with regard to position, energy, and angular resolution. We used two 10 × 10 LaBr,3, crystal arrays with a pixel size of 5 mm × 5 mm, silicon photomultipliers (SiPMs), and corresponding decoding circuits to construct our prototype. Additionally, a framework based on a Voronoi diagram and a lookup table was developed for list-mode projection data acquisition. Monte Carlo (MC) simulations based on Geant4 and experiments were conducted to evaluate the performance of our CC prototype. The lateral position resolution was 5 mm, and the maximum deviation in the depth direction was 2.5 and 5 mm for the scatterer and absorber, respectively. The corresponding measured energy resolutions were 7.65% and 8.44%, respectively, at 511 keV. The experimental results of ,137,Cs point-like sources were consistent with the MC simulation results with regard to the spatial positions and full widths at half maximum (FWHMs). The angular resolution of the fabricated prototype was approximately 6° when a point-like ,137,Cs source was centrally placed at a distance of 5 cm from the scatterer. We proposed and investigated a large-pixel LaBr,3, CC for the first time and verified its feasibility for use in accurate spatial positioning of radiative sources with a high angular resolution. The proposed CC can satisfy the requirements of radiative source imaging and positioning in the nuclear industry and medical applications.

关键词

Keywords

Compton cameraLarge pixelGamma cameraLaBr3 detectorPrototype evaluation

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Assistant Professor of Medical Physics, School of Medicine, Rafsanjan University of Medical Sciences

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Development and preliminary results of a large-pixel two-layer LaBr3 Compton camera prototype

DOI：10.1007/s41365-023-01273-5

摘要

Abstract

关键词

Keywords

references

Development and preliminary results of a large-pixel two-layer LaBr₃ Compton camera prototype