Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2018, Vol. 29 ›› Issue (10): 145 doi: 10.1007/s41365-018-0483-0


Preliminary results of a Compton camera based on a single 3D position sensitive CZT detector

Yi-Lin Liu1  • Jian-Qiang Fu 1 • Yu-Lan Li 1,2 • Yuan-Jing Li 1,2 • Xu-Ming Ma 2 • Lan Zhang 2   

  1. 1 Department of Engineering Physics, Tsinghua University, Beijing 100084, China
    2 Nuctech Co Ltd, Haidian District, Beijing 10084, China
  • Contact: Yi-Lin Liu
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Yi-Lin Liu, Jian-Qiang Fu, Yu-Lan Li, Yuan-Jing Li, Xu-Ming Ma, Lan Zhang. Preliminary results of a Compton camera based on a single 3D position sensitive CZT detector.Nuclear Science and Techniques, 2018, 29(10): 145     doi: 10.1007/s41365-018-0483-0


A Compton camera prototype has been developed using a pixelated CZT detector with 4-by-4 pixels. Signals of the detector are read out by a VASTAT ASIC that is controlled by a self-developed DAQ board. The DAQ software is developed using LabVIEW, and the offline Compton imaging codes are written in C??. The prototype has been successfully calibrated, and its capabilities for source detection, spectroscopy, and Compton imaging have been demonstrated using a Cs-137 source. The angular resolution of the 662 keV line is 36 FWHM for the simple back-projection method and 9.6 FWHM for the MLEM reconstruction method. The system is ready to be extended to 11-by-11 pixels in the future, and a better imaging quality can be expected due to the better relative position resolution.

Key words: Compton imaging, 3D position-sensitive technique, CZT detector