锥形束CT中简单动态滤波策略的数值验证
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深圳先进技术研究院

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R814.4

基金项目:

国家自然科学基金项目(面上项目,重点项目,重大项目)


Numerical validation of a simple dynamic beam filtration strategy in cone beam CT
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Shenzhen Institute of Advanced Technology

Fund Project:

The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)

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    摘要:

    背景:对于锥束计算机断层扫描(CBCT),长期以来人们希望能够调节X射线的强度和分布,以适应患者的解剖结构,尤其是在旋转扫描时。在此过程中,可以减少图像伪影和辐射剂量。然而,目前的滤波装置,如动态bowtie滤波器,可能在临床应用中过于复杂。 目标:旨在探讨一种简化的动态滤波策略,以减少CBCT成像中的图像伪影和辐射剂量。 方法:所设计的动态滤波策略随着CBCT的旋转过程中动态变化,具体而言,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)。针对三个人体部位(肩部、胸部和膝部)进行了数值仿真模拟。此外,使用蒙特卡洛模拟平台MC-GPU生成剂量分布图。 结果: 结果显示,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。根据扫描对象的不同,总辐射剂量可能减少30%。 结论: 所提出的简单动态滤波策略,尤其是DFSB方法,可能在未来帮助提高CBCT图像质量,同时减少图像伪影和辐射剂量,期望能够推进动态滤波策略的临床应用。

    Abstract:

    BACKGROUND:For cone beam computed tomography (CBCT), there has long been a wish 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. By doing so, both image artifacts and radiation dose would be reduced. However, the current beam modulation setups, such as dynamic bowtie filters, may be too complex for practical use in clinical applications. OBJECTIVE: This study aimed to investigate a simplified dynamic beam filtration strategy for CBCT imaging to reduce image artifacts and radiation dose. METHODS: In this study, the beam filtration was designed to vary dynamically as the gantry of the CBCT rotates around the object. Specifically, two distinct parts were integrated together: 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 with respect to three human body parts: shoulder, chest, and knee. In addition, the Monte Carlo simulation platform MC-GPU was used to generate the dose distribution maps. RESULTS: Results showed that the use of 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 may be reduced by 30%. CONCLUSIONS: The proposed simple dynamic beam filtration strategy, especially the DFSB approach, might be helpful in the future to improve the CBCT image quality with reduced image artifacts and radiation dose.

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引用本文

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,

Citing format
WANG HERAN, XIE JIXIONG, ZHU JIONGTAO, et al. Numerical validation of a simple dynamic beam filtration strategy in cone beam CT[J]. Journal of Integration Technology.

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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: 2024-10-31
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