Development and Characterization of Modular Readout Design for Two-Panel Head-and-Neck Dedicated PET System Based on CZT Detectors.
Development and Characterization of Modular Readout Design for Two-Panel Head-and-Neck Dedicated PET System Based on CZT Detectors.
复制标题
基于 CZT 探测器的两面板头颈专用 PET 系统模块化读出设计的开发和表征。
DOI：
10.1109/trpms.2021.3111547
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发表时间：
2022
影响因子：
4.4
通讯作者：
Abbaszadeh,Shiva
中科院分区：
文献类型：
--
作者：
Wang,Yuli;Herbst,Ryan;Abbaszadeh,Shiva
碲锌镉（CZT）探测器由于具有良好的能量分辨率和简单的像素化以实现高空间分辨率而适用于各种应用。本课题组正在研制一种基于CZT探测器的双面板头颈部专用正电子发射断层扫描系统。每个面板将由150个CZT晶体（440.5立方厘米）组成，覆盖面积为2015平方厘米，采用边缘配置，以实现511 keV的高探测器效率。在这项工作中，我们提出了一个完整的数据采集（DAQ）链，使每个面板的低噪声和紧凑的读出的设计和开发。使用1 kHz方波测试脉冲对读出电路的初始结果进行量化。选择脉冲幅度以产生与511 keV光子在CZT中提供的电荷量大致相同的电荷量。在511 keV下，最佳情况下的半高全宽（FWHM）电子噪声测量为0.69% ± 0.16%（转换后为3.52 ± 0.81 keV单位）。完整DAQ链在511 keV下的FWHM电子噪声为4.33% ± 0.30%（22.13 ± 1.53 keV单位）。
Cadmium zinc telluride (CZT) detectors are suitable for various applications due to the good energy resolution and the simple pixilation to achieve high spatial resolution. Our group is developing a two-panel head-and-neck dedicated positron emission tomography system based on CZT detectors. Each panel will consist of 150 CZT crystals (440.5 cm3) covering an area of 2015 cm2in an edge-on configuration to achieve high detector efficiency at 511 keV. In this work, we present the design and development of a full data acquisition (DAQ) chain that enables a low noise and compact readout for each panel. The initial results of the readout circuit were quantified using a 1-kHz square wave test pulse. The pulse amplitude was chosen to generate approximately the same amount of charges as a 511-keV photon would provide in CZT. The best-case full width at half maximum (FWHM) electronic noise at 511 keV was measured to be 0.69% ± 0.16% (3.52 ± 0.81 in keV units after conversion). The FWHM electronic noise at 511 keV for a complete DAQ chain was 4.33% ± 0.30% (22.13 ± 1.53 in keV units).