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首页> 外文期刊>IEEE Transactions on Medical Imaging >Online Combination of EPID & Cherenkov Imaging for 3-D Dosimetry in a Liquid Phantom
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Online Combination of EPID & Cherenkov Imaging for 3-D Dosimetry in a Liquid Phantom

机译:EPID和Cherenkov成像的在线组合,用于在液体幻影中进行3-D剂量测定

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摘要

Online acquisition of Cherenkov and portal imaging data was combined with a reconstruction scheme called EC3-D, providing a full 3-D dosimetry of megavoltage X-ray beams in a water tank. The methodology was demonstrated and quantified in a single static beam. Furthermore, the dynamics and visualization of the 3-D dose reconstruction were demonstrated with a volumetric modulated arc therapy plan for TG-119 C-Shape geometry. The developed algorithm combines depth dose information, provided by Cherenkov images, with the lateral dose distribution, provided by the electronic portal imaging device. The strength of our approach lies in the acquisition of both imaging data streams with sub-millimeter theoretical resolution at 5-Hz frame-rate, which can be concurrently processed by the fast Fourier transform-based analysis, thus providing means for an efficient real-time 3-D dosimetry.
机译:在线获取Cherenkov和门户影像数据与称为EC3-D的重建方案相结合,可提供水箱中兆伏X射线束的完整3-D剂量。该方法论在单个静态光束中得到了证明和量化。此外,针对TG-119 C形几何图形的容积调制电弧治疗计划展示了3-D剂量重建的动力学和可视化。所开发的算法将Cherenkov图像提供的深度剂量信息与电子门禁成像设备提供的横向剂量分布结合在一起。我们方法的优势在于可以以5 Hz的帧速率获取亚毫米级理论分辨率的两个成像数据流,这些数据流可以通过基于快速傅立叶变换的分析同时进行处理,从而提供了一种有效的实时图像处理方法。时间3-D剂量法。

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