High Resolution Digital Imaging X-ray Detectors

描述（由申请人提供）： 其目的是开发一种高分辨率，高对比度的数字X射线成像系统的探测器。目标探测器将具有远大于80%的探测量子效率、至少10 lp/mm的极限分辨率、超低噪声、线性响应和大于14位的动态范围。该提案是通过使用CdZnTe晶体来构建这样的探测器。探测器晶体与读出集成电路器件杂交，该读出集成电路器件允许信号被有效地收集、数字化并作为图像矩阵存储在计算机中。设计用于狭缝扫描系统的所设计的单个检测器单元在扫描方向上具有192个级，在非扫描方向上具有384个列。计划将探测器安装在交错阵列中，在非扫描方向上，末端重叠至整个乳房X射线图像宽度（约25 cm）。探测器像素间距为50微米，填充系数为100%。与目前的胶片系统相比，可以在不损失图像质量的情况下将患者剂量减少六倍。为了实现这些目标，在本提案中，我们计划开发和演示：高质量和高空间分辨率的凸点键合技术; CZT晶体的优化读出IC;以及可靠、低成本、高吞吐量的技术来测试和选择高质量、高均匀性的CZT晶体。

DESCRIPTION (provided by applicant): The aim is to develop a high resolution, high contrast detector for digital x-ray imaging systems. The target detector would have a Detective Quantum Efficiency much greater than 80%, a limiting resolution of at least 10 lp/mm, ultra-low noise, linear response and a dynamic range of more than 14 bits. The proposal is to build such a detector by using CdZnTe crystals. The detector crystal is hybridized to a readout integrated circuit device that allows the signal to be collected efficiently, digitized and stored in a computer as an image matrix. The planned individual detector unit, designed for use in a slot scan system, has 192 stages in the scan direction and 384 columns in the non-scan direction. The detectors are planned to be mounted in a staggered array with overlap at the ends up to the full breast x-ray image width (approximately 25 cm) in the non-scan direction. The detector pixel pitch will be 50 microns with 100% fill factor. Compared to the present film systems, a reduction of patient dose by a factor of six can be achieved without loss of image quality. To achieve these objectives, in this proposal we plan to develop and demonstrate: a high quality and high spatial resolution bump bonding technique; an optimized readout IC for the CZT crystals; and a reliable, low-cost, high throughput technique to test and select high quality, high uniformity CZT crystals.