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首页> 外文期刊>Optik: Zeitschrift fur Licht- und Elektronenoptik: = Journal for Light-and Electronoptic >Evaluation of gold K-edge imaging using spectral computed tomography with a photon-counting detector: A Monte Carlo simulation study
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Evaluation of gold K-edge imaging using spectral computed tomography with a photon-counting detector: A Monte Carlo simulation study

机译：用光子计数检测器使用光谱计算断层扫描的金k边缘成像评估：蒙特卡罗模拟研究

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摘要

Energy-integrating detectors (EIDs) are hard to reflect information of multi-energy X-rays due to its detection mechanism. On the other hand, photon-counting detectors (PCDs) are able to selectively acquire spectral information using energy thresholds. This characteristic of the PCDs allows the K-edge imaging technique, which is able to increase the contrast of high atomic number materials, such as iodine, gadolinium, and gold. Especially, the characteristics of gold can provide benefits for clinical applications because gold has minimal toxicity and a high K-edge absorption energy of 80.7 keV. In this study, a spectral CT system using a cadmium zinc telluride (CZT)-based PCD was designed by a Monte Carlo simulation tool. Phantoms were simulated to obtain gold K-edge and conventional CT images, and different reconstruction filters were used for investigating the noise property. The obtained images were evaluated by measuring contrast-to-noise ratios (CNRs). The results of this study showed that the CNRs of gold K-edge CT images were higher than those of conventional CT images, and a noise suppression filter improved the CNRs of gold K-edge CT images. It was concluded that gold has a high performance as a contrast agent, and the gold K-edge CT imaging enable the excellent material decomposition. (C) 2017 Elsevier GmbH. All rights reserved.
机译：能量积分探测器（EID）由于其检测机制而难以反映多能量X射线的信息。另一方面，光子计数检测器（PCD）能够选择性地使用能量阈值获取光谱信息。 PCD的这种特性允许K-Edge成像技术，其能够增加高原子数材料的对比，例如碘，钆和金。特别是，黄金的特性可以为临床应用提供益处，因为黄金具有最小的毒性和80.7keV的高k亮吸收能量。在该研究中，通过蒙特卡罗模拟工具设计了使用碲化镉锌（CZT）的PCD的光谱CT系统。模拟幽灵以获得金k边缘和常规CT图像，并且使用不同的重建过滤器来研究噪声性能。通过测量对比度噪声比（CNR）来评估所获得的图像。该研究的结果表明，金k边缘CT图像的CNRs高于传统CT图像的CNR，噪声抑制滤波器改善了金k边缘CT图像的CNR。得出结论，黄金具有高性能作为造影剂，金k边缘CT成像使得优异的材料分解能够。 （c）2017年Elsevier GmbH。版权所有。

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