Compact hybrid gamma camera with a coded aperture for investigation of nuclear materials

Taewoong Lee, Wonho Lee

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


Mechanical collimation commonly uses the photoelectric effect to reconstruct radiation images. Electronic collimation (i.e. Compton camera) using Compton scattering has been developed to reconstruct radiation images without utilizing mechanical collimators. Generally, for radiation imaging, electronic and mechanical collimation methods are used individually. In order to increase the quality of imaging and the efficiency of radiation detection, we combined both collimation methods in a single system. Our compact hybrid gamma camera comprised a modified uniformly redundant array (MURA) and a Compton camera, and the information from each modality was obtained simultaneously. The entire system formed a radial shape with detector modules which comprising CsI(Na) scintillators coupled with position-sensitive photomultiplier tubes (PSPMTs) whose anodes were connected to custom-made circuits. For various energy sources, the reconstructed images produced using this hybrid method were obtained and compared with reconstructed images from the two aforementioned methods. The maximum likelihood expectation maximization (MLEM) algorithm was applied for the reconstruction method. Compared with individual imagers at intermediate energies, the hybrid imager showed equal or better performance.

Original languageEnglish
Pages (from-to)5-13
Number of pages9
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Publication statusPublished - 2014 Dec 11

Bibliographical note

Funding Information:
This work was supported by National Research Foundation of Korea (NRF) grants ( 2012-0006399 , 2012M2AA401092 ) and BK21 Plus ( 21A20132212094 ), funded by the Korean government .


  • Compton camera (electronic collimation)
  • Hybrid
  • MLEM
  • MURA (mechanical collimation)

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation


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