| 一种锥束CT动态Bowtie的蒙特卡罗模拟研究 |
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| 引用本文： | 冯绪杨,伍伟文,朱慧杰,余海军,刘丰林.一种锥束CT动态Bowtie的蒙特卡罗模拟研究[J].CT理论与应用研究,2018,27(3):315-327. |
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| 作者姓名： | 冯绪杨 伍伟文 朱慧杰 余海军 刘丰林 |
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| 作者单位： | 1. 重庆大学机械工程学院, 重庆 400044; |
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| 基金项目： | The National Instrumentation Program of China (2013YQ030629).The National Natural Science Foundation of China (61471070) |
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| 摘 要： | 在CT中，前置于患者的衰减器（"Bowtie滤波器"或"Bowtie"）被用来减少患者所受的辐射剂量和帮助满足探测器的动态范围，同时Bowtie也能提高CT图像质量。传统的静态滤波器对调制X射线能力有限，我们之前提出了一种能够有效调制X射线的动态Bowtie滤波器。本文使用蒙特卡罗模拟方法设计和研究提议动态Bowtie滤波器。首先，建立了一个仿真框架，包括一个目标试样和一个由反射靶生成的多能谱射线源。接着，一个设计试样被用来辅助设计针对于目标试样的动态Bowtie滤波器。最后，我们分别从没有Bowtie滤波器和带有动态Bowtie滤波器两种模式中，模拟获得两个试样的投影数据并进行分析研究。结果显示，在设计的动态Bowtie作用下，到达探测器的X射线动态范围明显减小、X射线光子通量一致性很好，并且动态Bowtie可以减小辐射剂量和提高CT图像质量。
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| 关 键 词： | 计算层析成像 锥束 动态Bowtie 蒙特卡罗仿真 |
| 收稿时间： | 2018-03-22 |
Monte Carlo Simulation for a Dynamic Bowtie Filter with Cone-beam CT |
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| FENG Xu-yang,WU Wei-wen,ZHU Hui-jie,YU Hai-jun,LIU Feng-lin.Monte Carlo Simulation for a Dynamic Bowtie Filter with Cone-beam CT[J].Computerized Tomography Theory and Applications,2018,27(3):315-327. |
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| Authors: | FENG Xu-yang WU Wei-wen ZHU Hui-jie YU Hai-jun LIU Feng-lin |
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| Affiliation: | 1. College of Mechanical Engineering, Chongqing University, Chongqing 400044, China;2. ICT Research Center, Chongqing University, Chongqing 400044, China |
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| Abstract: | A pre-patient attenuator ("Bowtie filter" or "Bowtie") in X-ray computed tomography (CT) is used for reducing the radiation dose to patients and helping meet the detector dynamic range, and it also affects the CT image quality. Because a traditional static Bowtie filter is not optimal for modulating X-ray, we recently proposed a dynamic Bowtie filter for cone-beam CT, which could modulate X-ray more effectively. In this paper, we design and study the dynamic Bowtie using Monte Carlo simulation. First, we establish a simulation frame, which contains a target phantom and a polychromatic source generated by a reflection target. Next, a design phantom is employed to help design the dynamic Bowtie for the target phantom. Finally, we obtain two phantom projections from two modes of filter: no Bowtie and the dynamic Bowtie. The results demonstrate that, under the action of the designed dynamic Bowtie, the X-ray dynamic range on detectors is highly compressed for the design phantom and the target phantom, which means that our methodology facilitate to uniform the photon flux. Moreover, with the uniformed photon flux, the radiation exposure suffered by tested objects reduces and the reconstructed image quality is improved. |
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