In radiotherapy treatments utilizing accelerator gantry rotation, gantry-mounted kilovoltage (kV) imaging systems have become integral to treatment verification. The accuracy of such verification depends on the stability of the imaging components during gantry rotation. In this study, a simple measurement method and accurate algorithm are introduced for investigation of the kV panel and source movement during gantry rotation. The method is based on images of a ball-bearing phantom combined with a Winston-Lutz phantom, and determines the movements of all the mechanical parameters of the kV imaging system relative to the reference at zero gantry angle. Analysis was performed on different linear accelerators and both gantry rotation directions. The precision of the method was tested and was less than 0.04 mm. This method is suitable to be included in the quality assurance testing of linacs to monitor the kV imaging system performance and provides additional mechanical information t...

中文翻译：

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对 Varian 和 Elekta kV 成像系统在电弧输送过程中的稳定性进行全面调查

在利用加速器机架旋转的放射治疗中，机架安装千伏 (kV) 成像系统已成为治疗验证不可或缺的一部分。这种验证的准确性取决于机架旋转期间成像组件的稳定性。在这项研究中，介绍了一种简单的测量方法和精确的算法，用于研究机架旋转过程中 kV 面板和源的移动。该方法基于滚珠体模结合 Winston-Lutz 体模的图像，并确定 kV 成像系统的所有机械参数相对于参考在零龙门角度的运动。对不同的直线加速器和两个龙门旋转方向进行了分析。该方法的精密度经过测试，小于0.04 mm。