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

放射治疗一致性的质量保证（QA） 在当地， 全国范围内。 ROB采用网格、投影对齐和尺寸 预期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。 这个项目是为了覆盖 来自数字化模拟器和端口片的图像，电子射野图像 以及从CT数据数字重建的节段图像， 确定辐射场对准的准确性和可重复性， 相对于目标和关键解剖结构。 目前已经购置了一台扫描激光密度计。 这允许 我们将模拟器和端口胶片进行对比。 软件 数字化仪还允许我们在特殊的 我们的门户成像单元所需的格式，以便图像可以 利用这种方式。 此外，我们还开发了软件， 从任何成像模态获取图像胶片图像，并旋转， 缩放它们，以便可以立即进行比较。 正在开发额外的软件，以结合联合收割机的CT和MRI图像数据， 任何给定的患者，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.