锥形束CT 中简单动态滤波策略的数值验证
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R814.4

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国家自然科学基金项目(12305349, 12235006, 12027812);深圳市科技计划项目(JSGGKQTD20210831174329010);广东省基础与应用基础研究基金项目((2021TQ06Y108)


Numerical Validation of A Simple Dynamic Beam Filtration Strategy in Cone Beam CT
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National Natural Science Foundation of China (12305349,12235006, 12027812), Shenzhen Science and Technology Program (JSGGKQTD20210831174329010), Guangdong Basic and Applied Basic Research Foundation (2021TQ06Y108)

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    摘要:

    对于锥束计算机断层扫描(cone beam computed tomography,CBCT),人们一直希望能够在扫描过程中动态地调节X射线的强度和分布,以适应患者内部的解剖结构。这样就可以达到减少图像伪影和降低辐射剂量的目的。然而,目前的动态滤波装置,如动态 Bowtie 滤波器,其结构较为复杂难以真正应用到临床,因此,本研究旨在设计一种结构简单的动态滤波策略,以减少 CBCT 成像中的图像伪影同时降低辐射剂量。本研究所设计的动态滤波策略随着 CBCT 的旋转而动态变化,具体而言,该动态滤波策略是将两个不同部分集成在一起:滤片部分和 Bowtie 部分。该动态滤波策略设置有两种工作模式,一种是动态滤片与动态Bowtie的组合,称为动态滤片-动态Bowtie (Dynamic filter-Dynamic bowtie,DFDB);另一种是动态滤片与静态Bowtie的组合,称为动态滤片-静态Bowtie (Dynamic filter- Static bowtie,DFSB)。本研究分别针对 3 个人体部位(肩部、胸部和膝部)进行了数值仿真模拟,且使用蒙特卡罗模拟平台 MC-GPU 生成每个体模对应的剂量分布图。结果表明,使用所提出的 DFDB 和 DFSB 动态滤波方案可以显著减少图像伪影,从而改善 CBCT 图像质量。根据扫描部位的不同,辐射剂量的降低幅度达到约 30%。因此,本研究所提出的简单动态滤波策略 DFDB 和 DFSB,可以有效提升图像质量同时降低辐射剂量,且拥有足够简单的结构(尤其是 DFSB),在一定程度上推进了动态滤波策略的临床应用。

    Abstract:

    For cone beam computed tomography (CBCT), there has long been a desire to modulate the intensity and distribution of the X-rays to accommodate the patient’s anatomy as the gantry rotates from one projection to another. This would reduce both image artifacts and radiation dose. However, the current beam modulation setups, such as dynamic bowtie filters, may be too complex for practical use in clinical applications. This study aimed to investigate a simplified dynamic beam filtration strategy for CBCT imaging to reduce image artifacts and radiation dose. In this study, the beam filtration was designed to vary dynamically as the CBCT gantry rotates around the object. Specifically, two distinct components were integrated: the sheet filter part and the bowtie filter part. The dynamic beam filtration setup has two working schemes, one is a combination of dynamic sheet filter and dynamic bowtie filter, denoted as dynamic filter-dynamic bowtie (DFDB); the other is a combination of dynamic sheet filter and static bowtie filter, denoted as dynamic filter-static bowtie (DFSB). Numerical imaging experiments were performed for three human body parts: the shoulder, chest, and knee. In addition, the Monte Carlo simulation platform MC-GPU was used to generate the dose distribution maps. Results showed that the proposed DFDB and DFSB beam filtration schemes can significantly reduce the image artifacts and thus improve the CBCT image quality. Depending on the scanned object, the total radiation dose could be reduced by 30%. The proposed simple dynamic beam filtration strategy, especially the DFSB approach, could be beneficial in the future to improve the CBCT image quality with reduced image artifacts and radiation dose.

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引文格式
王鹤然,谢吉雄,朱炯滔,等.锥形束CT 中简单动态滤波策略的数值验证 [J].集成技术,2025,14(2):71-85

Citing format
WANG Heran, XU Jiaxin, LIN Mingxiang, et al. Numerical Validation of A Simple Dynamic Beam Filtration Strategy in Cone Beam CT[J]. Journal of Integration Technology,2025,14(2):71-85

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  • 收稿日期:2024-10-21
  • 最后修改日期:2024-10-29
  • 录用日期:2024-10-31
  • 在线发布日期: 2024-12-24
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