Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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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)
  • Received : 2020.04.06
  • Accepted : 2020.09.14
  • Published : 2021.04.25
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Abstract

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.

Keywords

Acknowledgement

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).

References

  1. J. Ha, Y. Song, An Investigation of awareness on the fukushima nuclear accident and radioactive contamination, J. Radiat. Protect. Res. 41 (2016) 7-14, https://doi.org/10.14407/jrpr.2016.41.1.007.
  2. K. Weinfurther, J. Mattingly, E. Brubaker, J. Steele, Model-based design evaluation of a compact, high-efficiency neutron scatter camera, Nucl. Instrum. Methods Phys. Res. Sect. A Accel. Spectrom. Detect. Assoc. Equip. 883 (2018) 115-135, https://doi.org/10.1016/j.nima.2017.11.025.
  3. T.M. Cannon, E.E. Fenimore, Coded aperture imaging: many holes make light work, Opt. Eng. 19 (3) (1980) 283-289, https://doi.org/10.1117/12.7972511.
  4. M. Jeong, M.D. Hammig, Comparison of gamma ray localization using system matrixes obtained by either MCNP simulations or ray-driven calculations for a coded-aperture imaging system, Nucl. Instrum. Methods Phys. Res. Sect. A Accel. Spectrom. Detect. Assoc. Equip. 893 (2018), 161353, https://doi.org/10.1016/j.nima.2018.10.031.
  5. R. Accorsi, Design of a Near-Field Coded Aperture Cameras for High Resolution Medical and Industrial Gamma-Ray Imaging, Ph.D. thesis Massachusetts Institute of Technology. Dept. of Nuclear Engineering, 2001.
  6. Y.A. Syahbana, Herman, A.A. Rahman, K.A. Baker, in: Aligned-PSNR(APSNR) for Objective Video Quality Measurement (VQM) in Video Stream over Wireless and Mobile Network, World Congress on Information and Communication Technologies (WCIT), 2011, pp. 330-335, https://doi.org/10.1109/WICT.2011.6141267.
  7. E. Padovani, S.A. Pozzi, MCNP-PoliMi ver.1.0 User's Manual, CESNEF-021125, Library of Nuclear Engineering Department, Polytechnic di Milano, November 2002.
  8. M. Jeong, B. Van, B.T. Wells, L.J. D'Aries, M.D. Hammig, Scalable gamma-ray camera for wide-area search based on silicon photomultipliers array, Rev. Sci. Instrum. 89 (2018), 033106, https://doi.org/10.1063/1.5016563.
  9. Y. Yan, W. Cao, S. Li, Block-adaptive image watermarking scheme using just noticeable difference, IEEE Int. Workshop Imag. Syst. Techn. (2009) 377-380, https://doi.org/10.1109/WICT.2011.6141267.
  10. R. Chaves, J. Ramirez, J.M. Gorriz, M. L opez, D. Salas-Gonzalez, I. Alvarez, F. Segovia, SVM-based computer-aided diagnosis of the Alzheimer's disease using t-test NMSE feature selection with feature correlation weighting, Neurosci. Lett. 461 (2009) 293-297, https://doi.org/10.1016/j.neulet.2009.06.052.
  11. A. Hore, D. Ziou, Image quality metrics: PSNR vs. SSIM, Proc. ICPR 34 (2010) 2366-2367, https://doi.org/10.1109/ICPR.2010.579.
  12. Simon R. Cherry, James A. Sorenson, Michael E. Phelps, Physics in Nuclear Medicine, fourth ed., Elsevier Health Sciences, 2011.
  13. P. Ndajah, H. Kikuchi, M. Yukawa, H. Watanabe, S. Muramatsu, SSIM image quality metric for denoised images. Proceedings of the 3rd WSEAS International Conference on Visualization, Imaging and Simulation (VIS '10), World Scientific and Engineering Academy and Society (WSEAS), Stevens Point, Wisconsin, 2010, pp. 53-57.
  14. Z. Wang, A.C. Bovik, H.R. Sheikh, E.P. Simoncelli, Image quality assessment: from error measurement to structural similarity, IEEE Trans. Image Process. 13 (2004) 600-612. https://doi.org/10.1109/TIP.2003.819861
  15. G. Knoll, Radiation Detection and Measurement, third ed., John Wiley & Sons Inc., 2000.
  16. A. Khadjavi, Calculation of solid angle subtended by rectangular apertures, J. Opt. Soc. Am. 58 (10) (1968) 1417-1418, https://doi.org/10.1364/JOSA.58.001417.
  17. M. Jeong, M. Hammig, Development of hand-held coded-aperture gamma ray imaging system based on GAGG (Ce) scintillator coupled with SiPM array, Nucl. Eng. Technol. (2020), https://doi.org/10.1016/j.net.2020.04.009.

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