Development of a prototype scintillator-based portable γ-ray imager with coded aperture for intraoperative applications

Shimazoe, Kenji; Horiki, Kazunari; Takahashi, Hidehiro

doi:10.1016/j.nima.2015.01.077

Cited by 4 publications

(3 citation statements)

References 7 publications

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“…As a result of the efforts to develop coded-aperture gamma imaging techniques, many nuclear technology research institutions and universities have researched and developed plenty-schemes coded-aperture gamma imaging cameras [1][2][3][4][5][6][7][8][9][10]. Most of the coded-aperture masks in these cameras are made from W-Cu alloy or tungsten because of their high density, which provides sufficient stopping power to gamma rays, and for convenience in shape manufacturing [1][2][3][4][6][7][8][9][10]. These masks are mainly based on the modified uniformity redundant array (MURA) pattern because of its significant theoretical imaging performance with minor sidelobe noise [11,12].…”

Section: Introductionmentioning

confidence: 99%

“…These masks are mainly based on the modified uniformity redundant array (MURA) pattern because of its significant theoretical imaging performance with minor sidelobe noise [11,12]. However, the design of the mask thickness generally has not been considered comprehensively: the mask may be designed directly to have a conventional thickness in the range from 2 mm to 25.4 mm [1-4, 6-8, 10]; or may only be designed by considering the applicable mask thickness required to attain an acceptable stopping power for a specific gamma ray energy [9].…”

Section: Introductionmentioning

confidence: 99%

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Impact of mask thickness on the imaging performance of the coded-aperture gamma camera

et al. 2022

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Coded-aperture gamma imaging techniques have been applied widely in several radiation monitoring fields. However, in terms of the design of the coded-aperture mask, the category and rank of the mask are generally considered, but there is a lack of detailed research on selection of the appropriate mask thickness. Concretely, the imaging performance is affected by the mask thickness in terms of two factors: the full-field image quality of the overall field of view (FOV), which represents the background noise tolerance of the radioactive source; and the image brightness consistency, which represents consistency of the imaging efficiency. We have studied and analyzed these two imaging performance indexes in relation to the mask thickness based on the model of our custom-made gamma camera. Specifically, the full-field image quality initially improves and later deteriorates with the mask thickness increases from 0.1 mm to 30 mm because of the competition and the tradeoff between the transmission background and the oblique irradiation effect; the image brightness consistency initially descends, then improves, and finally decreases again under the same conditions as a result of the tradeoff between the improvement of the transmission background ratio and deterioration of the oblique irradiation coefficient ratio. Furthermore, these two indexes change trends are both related to gamma-ray energy. Finally, based on a comprehensive analysis of the imaging performance, the optimal thicknesses for the customized W-Cu alloy modified uniformly redundant array masks for 59.5 keV, 662 keV, 1250 keV gamma-ray imaging are 0.5 mm, 10 mm, and 16 mm, respectively.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Impact of mask thickness on the imaging performance of the coded-aperture gamma camera

et al. 2022

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“…Nuclear medicine imaging with a gamma camera and a coded aperture mask was reported long ago [23][24][25][26][27][28][29][30][31], but this configuration has not yet been adopted in the clinical routine, even after four decades from initial developments [32]. CA masks have been first suggested for SLN scintigraphy in Ref.…”

Section: Introductionmentioning

confidence: 99%