McShan D L, Fraass B A, Lichter A S
Department of Radiation Oncology, University of Michigan Medical Center, Ann Arbor 48109.
Int J Radiat Oncol Biol Phys. 1990 Jun;18(6):1485-94. doi: 10.1016/0360-3016(90)90325-e.
A complete set of beam's eye view (BEV) and beam portal design features have been integrated into a computerized 3-dimensional radiotherapy treatment planning system. Among the features implemented is the ability to mix BEV graphics with gray-scale images such as simulator and verification radiographs, and digital reconstructed radiographs. Image processing techniques have been developed to both enhance verification images and to detect radiation field boundaries. These portal simulation and presentation techniques are being used clinically to design and verify radiation fields with manual or automatically-designed field shaping blocks. The ability to perform computer dose calculations for planes which are parallel or perpendicular to a specified beam's central axis is available and this feature has also proven useful for treatment plan evaluation and optimization. Finally, direct comparison of computer-generated portal images with actual simulation and verification radiographs is also possible. These techniques allow the direct integration of "CT-directed treatment planning" with block design, simulator films and port films, and other Beam's Eye View-type displays.
一套完整的射野视角（BEV）和射野设计特征已被整合到一个计算机化的三维放射治疗治疗计划系统中。所实现的特征包括将BEV图形与灰度图像（如模拟定位机和验证X光片以及数字重建X光片）混合的能力。已经开发了图像处理技术来增强验证图像并检测辐射野边界。这些射野模拟和呈现技术正在临床上用于通过手动或自动设计的射野成形挡块来设计和验证辐射野。对于与指定射束中心轴平行或垂直的平面进行计算机剂量计算的功能是可用的，并且该特征也已证明对治疗计划评估和优化很有用。最后，还可以将计算机生成的射野图像与实际模拟和验证X光片进行直接比较。这些技术允许将“CT引导的治疗计划”与挡块设计、模拟定位机胶片和射野胶片以及其他射野视角类型的显示进行直接整合。
