QA of Treatment Delivery by means of Overlaid Digitized Simulator Port Films

无论是在地方还是在全国，放射治疗与处方一致性的质量保证（QA）都是一个持续关注的问题。ROB采用光栅，将对准和尺寸信息直接投射到预期治疗场的模拟器胶片和所有相应的门户图像上。本项目将覆盖来自数字化模拟器和端口胶片的图像、电子门户图像和来自CT数据的数字重建分段图像，以确定辐射场对准目标和关键解剖结构的准确性和可重复性。现在每个病人的病历中都包含了数字化影像。这一功能正在被整合到新的记录和验证系统中。此外，我们还开发了软件，可以从任何成像方式获取胶片图像，并旋转和缩放它们，以便可以立即进行比较。另外的软件已经开发出交互式融合CT和MRI图像数据的任何给定的病人，以准确地确定目标体积。目前的研究涉及开发一种多模态植入式基准系统，以提高患者的定位精度，从而提高图像配准精度。正在进行研究，以确定目前在放射科使用的商业数字成像荧光粉板作为湿膜乳剂替代品的可行性。

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. Digitized films are now included as part of every patient's chart. This feature is being integrated into the new Record-and Verify system. Additionally, we have developed software to acquire film images from any imaging modality and to rotate and scale them so that they can be available for immediate comparison. Additional software has been developed to interactively fuse CT and MRI image data of any given patient to accurately determine target volumes. Current research involves the development of a multimodality implantable fiducial system for improving patient positioning accuracy, which will result in improved image registration accuracy. Research is being conducted to determine the feasibility of the commercial digital imaging phosphor plates currently used in the Radiology Department as a substitute for wet film emulsions.