Hybrid Pixel-Waveform (HPWF) Enabled CdTe Detectors for Small Animal Gamma-Ray Imaging Applications.
Hybrid Pixel-Waveform (HPWF) Enabled CdTe Detectors for Small Animal Gamma-Ray Imaging Applications.
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DOI：
10.1109/tns.2016.2623807
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发表时间：
2017-01
影响因子：
4.4
通讯作者：
Meng LJ
中科院分区：
文献类型：
--
作者：
Groll A;Kim K;Bhatia H;Zhang JC;Wang JH;Shen ZM;Cai L;Dutta J;Li Q;Meng LJ
本文介绍了用于伽马射线成像的配备混合像素-波形(HPWF)读出系统的小像素CdTe伽马射线探测器的设计和初步评估，并由于CZT的相似性而对其进行了额外的讨论。HPWF读出系统使用像素化阳极读出电路，该电路被设计为仅提供像素地址。该读出电路与高速数字转换器配合工作，以采样提供能量、时序和相互作用深度(DOI)信息的阴极波形。这项工作的重点是开发和实验评估的原型HPWF-CdTe探测器具有定制的CMOS像素专用集成电路读出尺寸为350μm的小阳极像素，以及离散波形采样电路来数字化在大阴极上感应的信号波形。结合相互作用深度(DOI)划分方法，对本征时间、能量和空间分辨率进行了实验评估。虽然本文讨论的实验研究主要是为了评估HPWF探测器在小动物PET成像中的应用，但这些探测器也可以应用于超高分辨率SPECT和其他成像方式。
This paper presents the design and preliminary evaluation of small-pixel CdTe gamma ray detectors equipped with a hybrid pixel-waveform (HPWF) readout system for gamma ray imaging applications with additional discussion on CZT due to its similarity. The HPWF readout system utilizes a pixelated anode readout circuitry which is designed to only provide the pixel address. This readout circuitry works in coincidence with a high-speed digitizer to sample the cathode waveform which provides the energy, timing, and depth-of-interaction (DOI) information. This work focuses on the developed and experimentally evaluated prototype HPWF-CdTe detectors with a custom CMOS pixel-ASIC to readout small anode pixels of 350 μm in size, and a discrete waveform sampling circuitry to digitize the signal waveform induced on the large cathode. The intrinsic timing, energy, and spatial resolution were experimentally evaluated in this paper in conjunction with methods for depth of interaction (DOI) partitioning of the CdTe crystal. While the experimental studies discussed in this paper are primarily for evaluating HPWF detectors for small animal PET imaging, these detectors could find their applications for ultrahigh-resolution SPECT and other imaging modalities.