Event classification in 3D position sensitive pixelated CdZnTe detectors

Kaye, Willy; Zhang, Feng; Boucher, Yvan A.; Wang, Weiyi; Kim, Jae Cheon; Zhu, Yuefeng; He, Zhong

doi:10.1109/nssmic.2011.6154709

Cited by 4 publications

(1 citation statement)

References 5 publications

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“…The depth of interaction is estimated via the cathode-to-anode ratio for single pixel events [14]. It has consistently shown a depth resolution better than 1 mm FWHM at 662 keV [15]. The OrionUM system is also capable of subpixel localisation of the gamma-ray interaction [16].…”

Section: Jinst 16 P03013mentioning

confidence: 99%

Time encoded imaging of extended gamma-ray sources in 3D using the OrionUM pixelated CdZnTe with subpixel estimation and depth of interaction corrections

Shy¹,

Petryk²,

Chen³

et al. 2021

J. Inst.

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Nuclear holdup, or the accumulation of material in processing equipment, is important to localize, identify, and quantify for economic reasons and criticality safety. As a part of the quantification process is to estimate the geometric distribution of the material, high-resolution 3D images are desired. To image gamma-ray material in 3D, we propose a time-encoded imaging technique that uses a mobile coded aperture to modulate the gamma-ray signal spatially and temporally. In the process, we investigate means to improve upon the image resolution. Naturally, the quality of the reconstructed image is dependent on the size of the aperture and the fidelity of the recorded projection, among other factors. The major degradation in the recorded projection originates from the poor position reconstruction of the gamma-ray interaction location within the detector. By utilizing the subpixel capabilities of the OrionUM pixelated CdZnTe system, the position of each gamma interaction can be estimated with a resolution of 500 μm full-width-at-half-maximum (FWHM) for a 120 keV gamma ray. With subpixel estimation, the average FWHM of a double-Gaussian fit improves by almost 10% when imaging two 57Co sources placed 1 cm apart. Next, by applying a collimator verified depth of interaction correction scheme, the image resolution improves by 7.5% and 12.3% for the FWHM and the full-width-at-tenth-maximum respectively for the studied source configuration. Finally, the estimation of the 3D distribution of a gamma-ray source is demonstrated via a depth refocusing technique. This technique is shown on spatially extended special nuclear material measured at Idaho National Laboratory and estimates the material's out of plane angle to within 20% of the true angle.

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Section: Jinst 16 P03013mentioning

confidence: 99%

Time encoded imaging of extended gamma-ray sources in 3D using the OrionUM pixelated CdZnTe with subpixel estimation and depth of interaction corrections

Shy¹,

Petryk²,

Chen³

et al. 2021

J. Inst.

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Solid State Radiation Detectors

Squillante

Christian

Entine³

2016

Wiley Encyclopedia of Electrical and Electronics Engineering

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For many applications including medical imaging, homeland security, nondestructive testing and scientific research, solid‐state radiation detectors provide the best combination of sensitivity per unit volume, flexibility in packaging, cost, and efficient conversion of ionizing radiation into electrical signals suitable for measurement with modern instrumentation. Solid‐state detectors are used for sensing all of the main forms of ionizing radiation including X‐rays, gamma rays, charged particles, and neutrons. Charged particles include electrons, beta particles, positrons, protons, alpha particles, fission fragments, and other ions. Solid‐state detectors include semiconductors, such as silicon and cadmium telluride, and scintillators coupled to solid state photodetectors such as NaI(Tl) coupled to silicon photodiodes. After more than 50 years of development, this remains an exciting area of research with regular reports of significant advances. The factors which make this such a thriving and growing area in radiation detection technology are the inherent advantages in size, weight, power, the need for high resolution digital imaging, low cost, as well as the availability of high performance computers capable of handling large amounts of data generated by large number of solid‐state detector elements. This article reviews the primary mechanisms by which ionizing radiation interacts with matter, how these interactions create electronic signals within the various types of solid‐state sensors, the properties of many of the more common solid‐state nuclear detectors, and a comparison of their properties as they relate to choosing among them for a particular application.

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Sub-pixel Sensing for Pixelated CdZnTe Detectors

Zhu

2023

X-Ray Photon Processing Detectors

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Event classification in 3D position sensitive pixelated CdZnTe detectors

Cited by 4 publications

References 5 publications

Time encoded imaging of extended gamma-ray sources in 3D using the OrionUM pixelated CdZnTe with subpixel estimation and depth of interaction corrections

Time encoded imaging of extended gamma-ray sources in 3D using the OrionUM pixelated CdZnTe with subpixel estimation and depth of interaction corrections

Solid State Radiation Detectors

Sub-pixel Sensing for Pixelated CdZnTe Detectors

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