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首页> 外文期刊>Nuclear Instruments & Methods in Physics Research >Solid-state photon-counting hybrid detector array for high-resolution multi-energy X-ray imaging
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Solid-state photon-counting hybrid detector array for high-resolution multi-energy X-ray imaging

机译：用于高分辨率多能量X射线成像的固态光子计数混合探测器阵列

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摘要

We present in this article the development of a photon-counting, energy-discriminating modular detector based on a pixelated CdZnTe sensor coupled pixel-by-pixel to a novel Digital Pixel Sensor (DPS) readout. The detector is designed for munitions inspection, breast X-ray CT and SPECT/MRI. The current DPS design can also be used to read out other solid-state sensors. The prototype detector is 5.5 mm x 5.5 mm in size, and consists of 19 x 19 pixels on a 250 urn pitch. The DPS is designed in a 0.35 p process, and every pixel includes a preamplifier, a leakage-current subtraction circuit, an auto-zeroed programmable-gain stage, five comparators, a variable-delay reset circuit and five 16 bit counters. The module is expected to operate at high X-ray fluence exceeding 80 MHz/mm~2, and to improve resolution and contrast in images, while significantly enhancing their signal-to-noise ratio, and assist in identifying material composition via dual-energy imaging. The detector design, fabrication and anticipated performance are discussed.
机译：我们在本文中介绍了一种基于像素化CdZnTe传感器的像素计数CdZnTe传感器与新型数字像素传感器（DPS）读数耦合的光子计数，能量区分模块探测器的开发。该探测器设计用于弹药检查，乳房X射线CT和SPECT / MRI。当前的DPS设计还可用于读取其他固态传感器。原型探测器的尺寸为5.5毫米x 5.5毫米，由19 x 19像素组成，间距为250 n。 DPS采用0.35 p的工艺设计，每个像素包括一个前置放大器，一个漏电流减法电路，一个自动调零的可编程增益级，五个比较器，一个可变延迟复位电路和五个16位计数器。该模块有望在超过80 MHz / mm〜2的高X射线通量下运行，并改善图像的分辨率和对比度，同时显着提高其信噪比，并通过双能帮助识别材料成分成像。讨论了探测器的设计，制造和预期性能。

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