Kijewski P K, Chin L M, Bjärngard B E
Med Phys. 1978 Sep-Oct;5(5):426-9. doi: 10.1118/1.594440.
We have recently installed a linear accelerator, modified to allow computer control of several machine parameters during irradiation of the patient. As an initial feasibility study of computer-controlled radiation therapy, its application to produce wedge-shaped dose distributions by moving the collimator jaws has been evaluated. The required collimator motions have been calculated with an iterative technique. When these routines were used during irradiations of phantoms containing radiographic film, a good correspondence between calculated and measured dose distributions was observed. It is concluded that computer-controlled motion of the collimator jaws to shape the dose distribution is technically feasible. Additionally, this technique has the advantage that the wedge angle can be continuously adjusted and the isodose curves optimized for a particular depth and field size.
我们最近安装了一台直线加速器，经过改装后可以在对患者进行照射期间通过计算机控制多个机器参数。作为计算机控制放射治疗的初步可行性研究，已经评估了通过移动准直器钳口来产生楔形剂量分布的应用。所需的准直器运动已通过迭代技术进行计算。当在含有射线照相胶片的模体照射期间使用这些程序时，观察到计算剂量分布与测量剂量分布之间具有良好的一致性。得出的结论是，通过计算机控制准直器钳口来塑造剂量分布在技术上是可行的。此外，该技术的优点是楔形角度可以连续调整，并且等剂量曲线可以针对特定深度和射野大小进行优化。
