Development of a CdZnTe-based small field-of-view gamma camera
Development of a CdZnTe-based small field-of-view gamma camera
复制标题
基于CdZnTe的小视场伽马相机的研制
DOI：
10.1117/12.450791
复制
发表时间：
2001
影响因子：
1.4
通讯作者：
C. A. Cupec
中科院分区：
文献类型：
--
作者：
K. Parnham;J. Grosholz;R. Davis;S. Vydrin;C. A. Cupec
在核医学应用中使用CdZnTe室温固态探测器的兴趣持续增长。几家公司和研究所正在努力开发CdZnTe探测器系统，以与现有的基于闪烁器的大视场（LFOV）伽马相机竞争。eV PRODUCTS专注于小视场（SFOV）伽马相机的开发，该相机使用单片CdZnTe探测器阵列，并与定制设计的低噪声模拟读出电子器件相耦合。ASIC中的电子噪声已被最小化，通常小于100 e- rms（0 pF）。探测器读出系统具有执行自动能量校准、增益设置和消能器电平设置的能力，沿着综合自诊断例程。完整的集成单元包括偏置电压发生器、计数器和通信控制。第一个原型256通道的设备已经开发和构造，像素尺寸为1.8 × 1.8 mm 2，34 × 34 × 5 mm 3单片CdZnTe探测器。从该系统获得的结果将被呈现，同时显示几个阵列的能量分辨率和均匀性数据。能量分辨率为3- 5%FWHM 140 keV，峰值效率为70- 80%。
The interest in the use of CdZnTe room-temperature, solid-state detectors for Nuclear Medicine applications continues to grow. Efforts are underway at several companies and institutes to develop CdZnTe detector systems to compete with existing scintillator-based Large Field of View (LFOV) gamma cameras. eV PRODUCTS is focusing on the development of Small Field of View (SFOV) gamma cameras using monolithic CdZnTe detector arrays coupled to custom designed, low noise analog read-out electronics. Electronic noise in the ASIC's has been minimized, and is typically less than 100 e- rms (0pF). The detector readout system has the capability to perform automatic energy calibration, gain setting and discrimator level setting, along with a comprehensive self-diagnostic routine. The complete integrated unit includes a bias voltage generator, counters and communication control. A first prototype 256-channel device has been developed and constructed, with pixel dimensions of 1.8 x 1.8 mm2, on a 34 x 34 x 5mm3 monolithic CdZnTe detector. Results obtained from this system will be presented, showing both the energy resolution and uniformity data for several arrays. The energy resolution has been demonstrated to be 3-5% FWHM 140 keV, with photopeak efficiencies of 70-80%.