Leavitt D D, Martin M, Moeller J H, Lee W L
University of Utah Medical Center, Salt Lake City 84132.
Med Phys. 1990 Jan-Feb;17(1):87-91. doi: 10.1118/1.596533.
Clinical treatment planning situations arise which require different wedge angles within segments of a single therapeutic x-ray field. Idealized wedge-shaped dose distributions, including combination of several wedge segments of different angle within a single field, are generated and delivered through computer control of asymmetric collimator motion and dose per field segment. A dual-pass technique is introduced to provide improved adherence to the prescribed isodose distribution. Dynamic wedge distributions are verified by film densitometry and ionization chamber measurement. These results suggest the potential importance of this technique as an added clinical radiotherapy tool.
临床治疗计划中会出现这样的情况，即在单个治疗性X射线野的各部分需要不同的楔形角。通过计算机控制不对称准直器运动和每个野段的剂量，生成并传递理想的楔形剂量分布，包括单个野内不同角度的多个楔形段的组合。引入了双程技术以更好地符合规定的等剂量分布。通过胶片密度测定法和电离室测量来验证动态楔形分布。这些结果表明该技术作为一种额外的临床放射治疗工具具有潜在的重要性。
