Preliminary evaluation of a novel energy-resolved photon-counting gamma ray detector

Meng, Ling Jian; Tan, Jiawei; Spartiotis, Konstantinos; Schulman, T.

doi:10.1016/j.nima.2009.02.043

Cited by 60 publications

(23 citation statements)

References 19 publications

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“…There are around 0.2% of pixels on the current detector that exhibited very low gain and therefore marked as the dead pixels. The uniformity of this detector is much improved over that of the first prototype reported in [2]. Fig.…”

Section: Experimental Studiesmentioning

confidence: 84%

“…All the wire-bonding pads, including the control signals, power feeds, and output signals, are located on one side of the ASIC (as shown in Fig. 3.b in [2]). In order to compensate for the pixel-to-pixel variations in the channel offset and gain, each channel is also equipped with two 8-bit digital-to-analog converters (DACs).…”

Section: The Erpc-asic-based Readout System For Anode Pixelsmentioning

confidence: 99%

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Development of a novel energy-resolved photon-counting detector for gamma ray imaging applications

et al. 2009

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In this paper, we present the design and preliminary performance evaluation of a novel energy-resolved photon-counting (ERPC) detector for gamma ray imaging applications. The prototype ERPC detector has an active area of 4.4 cm u 4.4 cm, which is pixelated into 128 u 128 square pixels with a pitch size of 350 Pm u 350 Pm. The current detector consists of multiple detector hybrids, each with a CdTe crystal of 1.1 cm u 2.2 cm u 1 mm, bump-bonded onto a customdesigned application-specific integrated circuit (ASIC). The ERPC ASIC has 2048 readout channels arranged in a 32u64 array. Each channel is equipped with pre-and shaping-amplifiers, a discriminator, peak/hold circuitry, and an analog-todigital converter (ADC) for digitizing the signal amplitude. In order to compensate for the pixel-to-pixel variation, two 8-bit DACs are implemented into each channel for tuning the gain and offset. The ERPC detector is designed to offer a high spatial resolution, a wide dynamic range of 12-200 keV and a good energy resolution of 3-4 keV. The hybrid detector configuration provides a flexible detection area that can be easily tailored for different imaging applications. The intrinsic performance of a prototype ERPC detector was evaluated with various gamma ray sources, and the results are presented.

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Section: Experimental Studiesmentioning

confidence: 84%

Section: The Erpc-asic-based Readout System For Anode Pixelsmentioning

confidence: 99%

Development of a novel energy-resolved photon-counting detector for gamma ray imaging applications

et al. 2009

Self Cite

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show abstract

“…All the wirebonding pads, including the control signals, power feeds, and output signals, are located on one side of the ASIC (as shown in Fig. 3.b in [7]). In order to compensate for the pixel-topixel variations in the channel offset and gain, each channel is also equipped with two 8-bit digital-to-analog converters (DACs).…”

Section: A the Energy-resolved Photon-counting Cdte Detectormentioning

confidence: 99%

A very-high resolution SPECT system based on the energy-resolved photon counting CdTe detectors

Cai

Tan

et al. 2010

IEEE Nuclear Science Symposuim &Amp; Medical Imaging Conference

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This paper presents preliminary experimental results obtained with a prototype SPECT system for small animal studies. This system is based on novel energy-resolved photon counting (ERPC) detectors we have recently developed for gamma ray imaging applications. The ERPC detector has basic modular configuration that offers an overall detection area of 4.5 cm × 4.5 cm, comprising of eight CdTe/CMOS detector hybrids. Each hybrid has a CdTe detector of 11 mm × 22 mm bump-bonded onto a dedicated readout ASIC that has 32 × 64 readout pixels with 350 μm pitch size. The 1mm and 2mm thickness CdTe detector have both been developed. This configuration offers a very-high spatial resolution of around 350 μm and an excellent energy resolution of around 3~4 keV at 140 keV. The prototype SPECT system that consists of two or four ERPC detectors is mounted on a system gantry rotating around a horizontal axis. The detectors are coupled to apertures with differently sized pinholes. In order to utilize the imaging information provided by the ERPC detector, we have developed a comprehensive system modelling and calibration method that accounts for the irregular shapes and physical details in the collimation apertures. Detailed system design and experimental procedures will be described in this paper.Index Terms -Energy-resolved photon counting detector, SPECT.

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“…Most SPECT systems are manufactured using NaI(Tl) technology even though a higher spatial resolution is necessary to achieve high anatomic detail. Thus, many researchers have proposed the use of pixelated semiconductor detectors such as cadmium telluride (CdTe) or cadmium zinc telluride (CZT) as a strategy to improve the spatial resolution of SPECT [4][5][6][7]. Recently, the demand for pixelated semiconductor detectors in the field * E-mail: hjk1@yonsei.ac.kr; Fax: +82-33-760-2562 of nuclear medicine imaging has been increasing.…”

Section: Introductionmentioning

confidence: 99%

Monte carlo simulation study of a novel parallel-hole collimator with a CdTe pixelated semiconductor SPECT system

Lee

Kim

Rhee

et al. 2014

Journal of the Korean Physical Society

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Recently, many studies have investigated the use of a pixelated semiconductor detector to improve spatial resolution. The purpose of this study was to evaluate novel parallel-hole collimator geometric designs with a CdTe pixelated semiconductor single-photon-emission computed tomography (SPECT) system. The pixelated semiconductor detector was modeled as a PID 350 detector (Ajat Oy Ltd., Finland) with small pixels (0.35 × 0.35 mm 2 ) by using Geant4 Application for Tomographic Emission (GATE) software. We designed a novel parallel-hole collimator consisting of two overlapping parallel-hole collimators. Each hole size was four times that of the pixelated parallel-hole collimator. The overlap ratios of these collimators were 1:1, 1:2, 2:1, 1:3, 3:1, 1:4, and 4:1. To evaluate the performance of this system, we evaluated the sensitivity and the spatial resolution. The results for our new parallel-hole collimator indicated that the evaluated sensitivity averages using overlap ratios of 1:1, 1:2, 2:1, 1:3, 3:1, 1:4, and 4:1 were 4. 45, 7.56, 7.51, 12.76, 12.65, 20.01, and 19.90 times higher, respectively, than those of the pixelated parallel-hole collimator. The evaluated averages of the spatial resolution varied depending on the source-to-collimator distances.In conclusion, we successfully designed a novel parallel-hole collimator with various overlap ratios of the collimator septal heights with a CdTe pixelated semiconductor SPECT system. Based on our results, we recommend using this collimator with a CdTe pixelated semiconductor SPECT system.

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Preliminary evaluation of a novel energy-resolved photon-counting gamma ray detector

Cited by 60 publications

References 19 publications

Development of a novel energy-resolved photon-counting detector for gamma ray imaging applications

Development of a novel energy-resolved photon-counting detector for gamma ray imaging applications

A very-high resolution SPECT system based on the energy-resolved photon counting CdTe detectors

Monte carlo simulation study of a novel parallel-hole collimator with a CdTe pixelated semiconductor SPECT system

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