Goitein M, Abrams M, Rowell D, Pollari H, Wiles J
Int J Radiat Oncol Biol Phys. 1983 Jun;9(6):789-97. doi: 10.1016/0360-3016(83)90003-2.
Three features of a fully three-dimensional treatment planning program are presented: (1) The beam's-eye-view provides the user with an accurate reproduction of anatomic features from the viewpoint of a treatment source. The source can be moved to any feasible position relative to the patient, permitting a choice which allows sensitive organs to be excluded from the beam. In this view a field defining aperture can readily be designed. (2) Back-projection of such an aperture shows the parts of the original transverse CT sections, or reconstructed sagittal or coronal sections, which may be covered by the selected beam. (3) Projection through the CT data from any desired origin provides an alignment film simulation which can be used to confirm accuracy of treatment, as well as help establish anatomic relationships relative to the margins of a treatment field.
（1）射野视角能从治疗源的角度为用户提供解剖特征的精确再现。治疗源可相对于患者移动到任何可行位置，从而能选择将敏感器官排除在射野之外。在此视角下，可轻松设计射野限定孔径。（2）这种孔径的反投影显示了原始横向CT断层或重建矢状面或冠状面断层中可能被所选射野覆盖的部分。（3）从任何所需原点穿过CT数据进行投影可提供模拟定位片，用于确认治疗的准确性，并有助于确定相对于治疗野边界的解剖关系。
