Cai Liang, Meng Ling-Jian
Department of Nuclear, Plasma, and Radiological Engineering, University of Illinois at Urbana Champaign, 216 Talbot Laboratory, 104 S Wrig, Urbana, Urbana, Illinois 61801, USA.
Nucl Instrum Methods Phys Res A. 2013 Feb 1;702. doi: 10.1016/j.nima.2012.08.069.
In this paper, we will present a new small pixel CdTe/CZT detector for sub-500 μm resolution SPECT imaging application inside MR scanner based on a recently developed hybrid pixel-waveform (HPWF) readout circuitry. The HPWF readout system consists of a 2-D multi-pixel circuitry attached to the anode pixels to provide the X-Y positions of interactions, and a high-speed digitizer to read out the pulse-waveform induced on the cathode. The digitized cathode waveform could provide energy deposition information, precise timing and depth-of-interaction information for gamma ray interactions. Several attractive features with this HPWF detector system will be discussed in this paper. To demonstrate the performance, we constructed several prototype HPWF detectors with pixelated CZT and CdTe detectors of 2-5 mm thicknesses, connected to a prototype readout system consisting of energy-resolved photon-counting ASIC for readout anode pixels and an Agilent high-speed digitizer for digitizing the cathode signals. The performances of these detectors based on HPWF are discussed in this paper.
在本文中，我们将展示一种新型小像素碲化镉（CdTe）/碲锌镉（CZT）探测器，用于基于最近开发的混合像素波形（HPWF）读出电路的磁共振成像（MR）扫描仪内分辨率低于500微米的单光子发射计算机断层扫描（SPECT）成像应用。HPWF读出系统由连接到阳极像素的二维多像素电路组成，用于提供相互作用的X-Y位置，以及一个高速数字化仪，用于读出在阴极上感应的脉冲波形。数字化的阴极波形可以为伽马射线相互作用提供能量沉积信息、精确的定时和相互作用深度信息。本文将讨论这种HPWF探测器系统的几个吸引人的特性。为了演示其性能，我们构建了几个HPWF探测器原型，这些探测器采用了厚度为2-5毫米的像素化CZT和CdTe探测器，并连接到一个原型读出系统，该系统由用于读出阳极像素的能量分辨光子计数专用集成电路（ASIC）和用于数字化阴极信号的安捷伦高速数字化仪组成。本文将讨论这些基于HPWF的探测器的性能。
