A method of large irregular field compensation

作者：Philip M. K. Leung, Jake Van Dyk, Jean Robins · 发表于：British Journal of Radiology · 年份：1974 · DOI：10.1259/0007-1285-47-563-805 · 被引用次数：33 · 研究领域：Advanced Radiotherapy Techniques、Radiation Effects and Dosimetry、Radiation Therapy and Dosimetry

For large irregular field radiation treatments, the dose distribution is affected by (a) the surface contour, (b) the change in SSD at points away from the central ray of the beam, and (c) the change in scatter conditions due to the irregular shape of the field. These combined effects could produce a dose variation within the irradiated volume up to 30 per cent. In this report a method of compensating for all these effects is described with special consideration being given to a simple method of producing a missing tissue compensator. This method incorporates a simple mechanical device for marking out thin lead sheets to show lines of equal air gap distance.