Nuclear Engineering and Technology

  • 제53권4호
  • /
  • Pages.1266-1276
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  • 2021
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  • 1738-5733(pISSN)
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  • 2234-358X(eISSN)
한국원자력학회 (Korean Nuclear Society)
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Impact of aperture-thickness on the real-time imaging characteristics of coded-aperture gamma cameras

  • Park, Seoryeong (Department of Nuclear and Energy Engineering, Jeju National University) ;
  • Boo, Jiwhan (Department of Nuclear and Energy Engineering, Jeju National University) ;
  • Hammig, Mark (Department of Nuclear Engineering & Rad. Sci., University of Michigan-Ann Arbor) ;
  • Jeong, Manhee (Department of Nuclear and Energy Engineering, Jeju National University)
  • 투고 : 2020.04.06
  • 심사 : 2020.09.14
  • 발행 : 2021.04.25
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초록

The mask parameters of a coded aperture are critical design features when optimizing the performance of a gamma-ray camera. In this paper, experiments and Monte Carlo simulations were performed to derive the minimum detectable activity (MDA) when one seeks a real-time imaging capability. First, the impact of the thickness of the modified uniformly redundant array (MURA) mask on the image quality is quantified, and the imaging of point, line, and surface radiation sources is demonstrated using both cross-correlation (CC) and maximum likelihood expectation maximization (MLEM) methods. Second, the minimum detectable activity is also derived for real-time imaging by altering the factors used in the image quality assessment, consisting of the peak-to-noise ratio (PSNR), the normalized mean square error (NMSE), the spatial resolution (full width at half maximum; FWHM), and the structural similarity (SSIM), all evaluated as a function of energy and mask thickness. Sufficiently sharp images were reconstructed when the mask thickness was approximately 2 cm for a source energy between 30 keV and 1.5 MeV and the minimum detectable activity for real-time imaging was 23.7 MBq at 1 m distance for a 1 s collection time.

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과제정보

This work was partly supported by Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government (MOTIE) (20181520302230) and by the Nuclear Safety Research Program through the Korea Foundation of Nuclear Safety (KoFONS) using the financial resource granted by the Nuclear Safety and Security Commission (NSSC) of the Republic of Korea (No. 1903011-0119-CG100). This work was supported by the U.S. Army of the Dept. of Defense (Contract #: W15QKN-12-C-0047).

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피인용 문헌

  1. Compact lightweight imager of both gamma rays and neutrons based on a pixelated stilbene scintillator coupled to a silicon photomultiplier array vol.11, pp.1, 2021, https://doi.org/10.1038/s41598-021-83530-4