Comparison of the Motion Accuracy of a Six Degrees of Freedom Radiotherapy Couch with and without Weights
Comparison of the Motion Accuracy of a Six Degrees of Freedom Radiotherapy Couch with and without Weights作者机构：Department of Radiology Kanazawa University Hospital Kanazawa Japan Faculty of Health Sciences Institute of Medical Pharmaceutical and Health Sciences Kanazawa University Kanazawa Japan
出 版 物：《International Journal of Medical Physics, Clinical Engineering and Radiation Oncology》 (医学物理学、临床工程、放射肿瘤学（英文）)
年 卷 期：2013年第2卷第3期
页 面：69-75页
学科分类：1002[医学-临床医学] 100214[医学-肿瘤学] 10[医学]
主 题：6D Couch IGRT Accuracy Assessment
摘 要：In this study, we compared the motion accuracy of six degrees of freedom (6D) couch for precision radiotherapy with or without weights attached to the couch. Two digital cameras were focused on the iso-center of a linear accelerator. Images of a needle which had been fixed to the 6D couch were obtained using the cameras when the couch moved in translation and rotation around each axis. The three-dimensional (3D) coordinates of the needle were calculated from coordinate values in the images. A coordinate error of the needle position relative to the theoretical position was calculated. The errors were obtained with or without a 60 kg weight attached to the 6D couch, and these errors were compared with each other. The mean distance of the 3D error vectors for the weighted test was 0.21 ± 0.11 mm, and 0.16 ± 0.09 mm for the non-weighted test (p
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