Preliminary evaluation of a novel energy-resolved photon-counting gamma ray detector.
Preliminary evaluation of a novel energy-resolved photon-counting gamma ray detector.
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DOI：
10.1016/j.nima.2009.02.043
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发表时间：
2009-06-11
期刊：
影响因子：
--
通讯作者：
Schulman T
中科院分区：
文献类型：
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作者：
Meng LJ;Tan JW;Spartiotis K;Schulman T
在本文中，我们介绍了一种用于伽马射线成像应用的新型能量分辨光子计数（ERPC）探测器的设计和初步性能评估。原型ERPC探测器的有效区域为4.4 cm × 4.4 cm，像素化为128 × 128方形像素，节距尺寸为350 µm × 350 µm。电流探测器由多个探测器混合体组成，每个探测器都有一个 1.1 cm × 2.2 cm × 1 mm 的 CdTe 晶体，凸点键合到定制设计的专用集成电路 (ASIC) 上。 ERPC ASIC 有 2048 个读出通道，排列成 32 × 64 阵列。每个通道都配备了前置放大器和整形放大器、鉴频器、峰值/保持电路以及用于数字化信号幅度的模数转换器 (ADC)。为了补偿像素到像素的变化，每个通道中都实现了两个 8 位数模转换器 (DAC)，用于调整增益和偏移。 ERPC 探测器旨在提供高空间分辨率、12-200 keV 的宽动态范围和 3-4 keV 的良好能量分辨率。混合探测器配置提供了灵活的探测区域，可以轻松地针对不同的成像应用进行定制。使用各种伽马射线源评估了原型 ERPC 探测器的内在性能，并给出了结果。
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 × 4.4 cm, which is pixelated into 128 × 128 square pixels with a pitch size of 350 µm × 350µm. The current detector consists of multiple detector hybrids, each with a CdTe crystal of 1.1 cm × 2.2 cm × 1 mm, bump-bonded onto a custom-designed application-specific integrated circuit (ASIC). The ERPC ASIC has 2048 readout channels arranged in a 32 × 64 array. Each channel is equipped with pre- and shaping-amplifiers, a discriminator, peak/hold circuitry and an analog-to-digital converter (ADC) for digitizing the signal amplitude. In order to compensate for the pixel-to-pixel variation, two 8-bit digital-to-analog converters (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.