Development of a panorama coded-aperture gamma camera for radiation detection

Sun, Shaobo; Zhang, Zhiming; Shuai, Lei; Li, Daowu; Wang, Yingjie; Liu, Yantao; Huang, Xianchao; Tang, Haina; Li, Ting; Chai, Peiqi; Jiang, Xiang Ping; Ma, Bo; Zhu, Ming‐Jun; Wang, Xiaoming; Zhang, Yiwen; Zhou, Wei; Zeng, Fanjian; Guo, Jing; Sun, Liling; Yang, Mingjie; Zhang, Yubao; Wei, Cunfeng; Ma, Chao; Wei, Long

doi:10.1016/j.radmeas.2015.04.014

Cited by 32 publications

(12 citation statements)

References 17 publications

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“…CINTILLATOR based radiation detectors have been successfully employed in application fields, such as nuclear medicine [1], [2], homeland security [3] and nuclear decommissioning [4], [5]. In each case, accurate localisation of the radioisotopes is of vital importance, since failing to do so would pose a threat to human lives.…”

Section: Introductionmentioning

confidence: 99%

Design and development of a real-time readout electronics system to retrieve data from a square multi-anode photomultiplier tube for neutron gamma pulse shape discrimination

Cieślak

Gamage

2016

2016 IEEE-NPSS Real Time Conference (RT)

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Abstract-Pulse Shape Discrimination (PSD) algorithms can reliably separate neutrons and gamma-ray photons interacting in a scintillation detector. When implemented in the digital domain, the PSD algorithms allow real-time discrimination between neutron and gamma sources. This paper presents a design of a readout electronics system to retrieve data from a multi-anode photomultiplier tube (MAPMT) for a scintillator based codedaperture neutron imager. The scintillator is to be coupled with Hamamatsu H9500, a square MAPMT, where each anode of the MAPMT is linked to a resistor network to infer the position of incidence of radiation within the scintillant. Additionally, the resistor network output signals are to be filtered through a novel noise reduction circuit to preserve the data corresponding to each pulse. Localised pulses are digitised using high sampling rate Analogue to Digital Converter (ADC). Sampled signals are temporarily stored in a local ping-pong buffer, before being processed on a field programmable gate array (FPGA). Initial results suggest that 150 MSPS rate provides sufficient information for neutron gamma source discrimination using PSD. Parallel real-time signal processing, implemented on the FPGA, enables multi-channel functioning to generate an array of interactions within the scintillator in terms of gamma rays and neutrons.

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Section: Introductionmentioning

confidence: 99%

Design and development of a real-time readout electronics system to retrieve data from a square multi-anode photomultiplier tube for neutron gamma pulse shape discrimination

Cieślak

Gamage

2016

2016 IEEE-NPSS Real Time Conference (RT)

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“…The current experimental research on the imaging performance of coded-aperture gamma-ray camera focuses mainly on point source imaging, but there is barely any in-depth experimental research on plane source imaging performance with only primary study on simulation or trial imaging of nuclear radiation scenarios. For example, the Institute of High Energy Physics, Chinese Academy of Sciences, has supported studies on the imaging performance of a 68 Ge point source using a coded-aperture gamma-ray camera; researchers from North China Electric Power University have simulated the imaging performance of the camera for complex plane sources; the CANBERRA trial validated the imaging performance of the camera for a pipeline plane source in nuclear power plants [2,11,12]. Apparently, the scant experimental research on imaging quality of plane sources in laboratories is attributed to the difficulty in obtaining complex plane sources with specific activity distributions.…”

Section: Introductionmentioning

confidence: 99%

A novel method for assessing imaging quality of coded-aperture gamma-ray camera to radioactive plane source

et al. 2023

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With the wide application of the coded-aperture gamma-ray camera in the field of nuclear radiation monitoring, research on its imaging performance of radioactive point sources has increasingly matured. However, because of the difficulty in obtaining complex radioactive plane sources with specific activity distributions, there is a lack of experimental research on imaging performance of such sources currently, the main focus being on simulation research and on-site imaging trials. In addressing the issue, we proposed a method to assess image quality of coded-aperture gamma-ray camera to such sources, and performed imaging experiments with a custom-made gamma-ray camera. Driven by a two-axis computer-numerical control (CNC) motion platform, a point source was moved through prescribed paths at a given velocity, from which a custom activity distribution plane source for coded-aperture imaging was constructed. Peak signal-to-noise ratio and structural index similarity were the two indicators used to evaluate the imaging quality of the plane source for seven distinct shapes. The results indicate that the imaging quality of the plane source imaged by our custom-made camera and constructed using our method is excellent with these two indicators being better than 17 dB and 0.996, respectively. Our method provides good reliability and practicality, and offers an alternative approach for assessing imaging quality of coded-aperture gamma-ray camera for complex radioactive plane sources.

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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%

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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Development of a panorama coded-aperture gamma camera for radiation detection

Cited by 32 publications

References 17 publications

Design and development of a real-time readout electronics system to retrieve data from a square multi-anode photomultiplier tube for neutron gamma pulse shape discrimination

Design and development of a real-time readout electronics system to retrieve data from a square multi-anode photomultiplier tube for neutron gamma pulse shape discrimination

A novel method for assessing imaging quality of coded-aperture gamma-ray camera to radioactive plane source

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

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