Scheer A C, Ledley R S
Department of Radiation Oncology, Georgetown University Hospital, Washington, D.C. 20007.
Comput Tomogr. 1977;1(4):275-82. doi: 10.1016/0363-8235(77)90012-6.
Computerized tomography is useful in radiotherapy treatment planning in the following ways: (1) Its image provides the most accurate possible contour of the patient and demonstrates the internal structures in their proper relation to each other. (2) The tumor and its extension are accurately demonstrated. (3) Corrections for tissue heterogeneities can be accomplished in one of two ways, either by arbitrary assignment of densities to tissues or by direct scanning with a therapy source. This latter procedure is under investigation. (4) The computer can be programmed to demonstrate summations of dose delivered from multiple fields.
（1）其图像能提供最精确的患者轮廓，并显示内部结构及其相互之间的正确关系。（2）能准确显示肿瘤及其范围。（3）可通过以下两种方式之一对组织不均匀性进行校正，要么对组织任意指定密度，要么用治疗源直接扫描。后一种方法正在研究中。（4）可对计算机进行编程，以显示多个射野所给予剂量的总和。
