[Quantitative Analysis of the Impact of Various iCBCTs on the Image Quality of Lung Adaptive Radiotherapy].

Q4 Medicine

中国医疗器械杂志 Pub Date : 2025-07-30 DOI:10.12455/j.issn.1671-7104.250014

Ruifeng Zhao, Bin Su, Xiaofei Jiang

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引用次数: 0

Abstract

Objective: To investigate the impact of different iterative cone beam CT (iCBCT) scanning beam currents from a ring-mounted linac on synthetic CT image quality for lung adaptive radiotherapy under lung scanning protocol.

Methods: The CIRS lung motion phantom was configured to simulate conventional respiratory motion pattern, followed by 4D-CT simulation. After transferring the radiotherapy plan to the ring-mounted Halcyon 3.0 linac, three groups of typical iCBCT scans with different beam currents [ I _low (160 mA), I _middle (282 mA), and I _high (491 mA)] were performed and corresponding image reconstructions were completed. Synthetic CT (sCT) images were subsequently obtained based on the deformable registration algorithm.

Results: Compared to the corresponding CBCT images, the sCT images exhibited a significant reduction in artifacts. The fine structure of the planning CT (pCT) image was preserved for sCT images corresponding to different scanning beam currents, with Dice similarity coefficients exceeding 0.90 for all cases.

Conclusion: The image quality of sCT corresponding to different iCBCTs is comparable to that of pCT, and changes in iCBCT beam parameters have a negligible impact on sCT image quality. Taking into account both image quality and imaging dose factors associated with the beam currents, iCBCT with a lower beam current on the ring-mounted Halcyon linac offers greater clinical value in lung adaptive radiotherapy.

查看原文本刊更多论文

[各种icbct对肺部适应性放疗图像质量影响的定量分析]。

目的：研究环形直线加速器不同迭代锥束CT （iCBCT）扫描光束电流对肺部扫描方案下肺适应性放疗合成CT图像质量的影响。方法：配置CIRS肺运动模体模拟常规呼吸运动模式，然后进行4D-CT模拟。将放疗计划转移到环形安装的Halcyon 3.0直线加速器后，进行3组不同束流（1低（160 mA）、1中（282 mA）、1高（491 mA））的典型iCBCT扫描，并完成相应的图像重建。基于可变形配准算法获得合成CT （sCT）图像。结果：与相应的CBCT图像相比，sCT图像显示出明显的伪影减少。对于不同扫描波束电流对应的sCT图像，保留了规划CT （pCT）图像的精细结构，Dice相似系数均大于0.90。结论：不同iCBCT对应的sCT图像质量与pCT相当，iCBCT光束参数的变化对sCT图像质量的影响可以忽略不计。考虑到与光束电流相关的图像质量和成像剂量因素，在环形安装的Halcyon直线加速器上具有较低光束电流的iCBCT在肺部适应性放疗中具有更大的临床价值。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

中国医疗器械杂志 Medicine-Medicine (all)

CiteScore

0.40

自引率

0.00%

发文量

8086

期刊介绍： Chinese Journal of Medical Instrumentation mainly reports on the development, progress, research and development, production, clinical application, management, and maintenance of medical devices and biomedical engineering. Its aim is to promote the exchange of information on medical devices and biomedical engineering in China and turn the journal into a high-quality academic journal that leads academic directions and advocates academic debates.