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首页> 外文期刊>Medical image analysis >Brachytherapy seed reconstruction with joint-encoded C-arm single-axis rotation and motion compensation.
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Brachytherapy seed reconstruction with joint-encoded C-arm single-axis rotation and motion compensation.

机译：关节编码C臂单轴旋转和运动补偿的近距离放射疗法种子重建。

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摘要

C-arm fluoroscopy images are frequently used for qualitative assessment of prostate brachytherapy. Three-dimensional seed reconstruction from C-arm images is necessary for intraoperative dosimetry and quantitative assessment. Seed reconstruction requires accurately known C-arm poses. We propose to measure the C-arm rotation angles and computationally compensate for inevitable C-arm motion to compute the pose. We compensate the translational motions of a C-arm, such as oscillation, sagging and wheel motion using a three-level optimization algorithm and obviate the need for full pose tracking using external trackers or fiducials. We validated our approach on simulated and 100 clinical data sets from 10 patients and gained on average, a seed matching rate of 98.5%, projection error of 0.33 mm (STD=0.21 mm) and computation time of 19.8s per patient, which must be considered as clinically excellent results. We also show that without motion compensation the reconstruction is likely to fail.
机译：C型臂透视图像经常用于前列腺近距离放射治疗的定性评估。从C型臂图像重建三维种子对于术中剂量测定和定量评估是必要的。种子重建需要准确知道的C型臂姿势。我们建议测量C臂旋转角度并通过计算补偿不可避免的C臂运动以计算姿势。我们使用三级优化算法来补偿C臂的平移运动，例如振荡，下垂和车轮运动，并且无需使用外部跟踪器或基准进行全姿势跟踪。我们从10位患者的模拟和100个临床数据集上验证了我们的方法，平均获得了98.5％的种子匹配率，0.33 mm的投影误差（STD = 0.21 mm）和每位患者19.8s的计算时间，必须被认为是临床上优异的结果。我们还表明，如果没有运动补偿，则重建很可能会失败。

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