QA OF TREATMENT DELIVERY BY MEANS OF OVERLAID DIGITIZED SIMULATOR PORT FILMS

放射治疗一致性的质量保证 与处方一起送货是一个持续不断的问题，无论是在当地还是在 全国范围内。Rob使用经纬网，投影对齐和大小 计划治疗的两个模拟器胶片上的直接信息 字段和所有相应的门户图像。该项目将覆盖 来自数字化模拟器和端口胶片的图像、电子门户图像 并从CT数据数字化重建节段图像，以便 确定辐射场对准的准确性和重复性 尊重目标和关键的解剖结构。 目前，已经获得了一台扫描激光密度计。这允许 美国将模拟器和端口电影数字化，以便进行比较。软件用于 数字化仪还允许我们读写特殊格式的文件 我们的门户成像单元所需的格式，以便图像可以 从这种模式中使用。此外，我们还开发了软件来 从任何成像模式获取图像胶片图像，并旋转和 对它们进行扩展，以便可以立即进行比较。 正在开发其他软件，以将CT和MRI图像数据结合在一起 任何给定的患者都可以准确地确定目标体积。

The quality assurance (QA) of the consistency of radiation treatment delivery with the prescription is a continual concern, locally as well as nationally. The ROB employs graticules, projecting alignment and size information directly on both simulator films of the intended treatment fields and all corresponding portal images. This project is to overlay images from digitized simulator and port films, electronic portal images and digitally reconstructed segmental images from CT data in order to determine the accuracy and repeatability of radiation field alignment with respect to the target and critical anatomical structures. Currently a scanning laser densitometer has been acquired. This permits us to digitize both simulator and port films for comparison. Software for the digitizer also allows us to read and write files in the special formats necessary for our portal imaging unit, so that images can be utilized from this modality. Additionally we have developed software to acquire images film images from any imaging modality and to rotate and scale them so that they can be available for immediate comparison. Additional software is being developed to combine CT and MRI image data of any given patient to accurately determine target volumes.