CLINICAL RADIATION PHYSICS SERVICE

该科继续提供专家物质和技术支助 用于放射治疗，包括常规校准、质量 所有产生辐射的设备的保证和一线维护， 辅助设备 它包括特殊剂量测定研究、计算机- 辅助治疗计划以及设计和开发特殊的 为满足临床发展需要而量身定制的设备。 目前的研究已经指向精确测量剂量 分发给接受TBI进行骨髓移植的患者， 改善剂量均匀性。 剂量现在计算的基础上点二极管 使用新开发的算法进行测量。 剂量均匀度为 通过在头部和颈部使用缺失的组织补偿器来最大化 地区 根据库检查新的患者轮廓曲线， 现有的补偿器进行精确匹配。 因此，新的补偿器 仅在必要时制造，并添加到现有库中。 下一步将进行研究，以提高患者的准确性 将手臂抬高并支撑在一个支架上， 将剂量调节至预期值。 这种支持将暴露 这样就可以使用合适的屏蔽块。 与海军研究所合作的一个项目也正在启动 评价半导体掺杂Vycor临床效用的实验室 玻璃作为氟化锂（LiF）的替代品，用于热释光 光子和电子束的剂量测定。 该项目将扩大到 开发一种多纤维剂量计读数器，使用Vycor玻璃剂量计， 到光纤。 该系统的优点是提供 间歇剂量和剂量率读数，并应在 临床、辐射防护和环境远程剂量测定。

The section continues to provide expert physical and technological support for radiation treatment, consisting of routine calibration, quality assurance and first-line maintenance of all radiation producing and ancillary equipment. It includes special dosimetry studies, computer- assisted treatment planning and the design and development of special equipment tailored to developing clinical needs. Current research has been directed towards accurately measuring the dose distribution to patients receiving TBI for bone marrow transplant and to improving dose uniformity. Doses are now calculated based on point diode measurements using a newly developed algorithm. Dose uniformity is maximized by employing missing tissue compensators in the head and neck region. New patient contour profiles are checked against a library of existing compensators for an accurate match. New compensators are thus only manufactured when necessary and are added to the existing library. Research will next be conducted to improve the accuracy of patient positioning with the arms elevated and supported on a rest designed to modulate the dose to the expected value. This support will then expose the lungs so that appropriate shielding blocks can be used. A project is also starting in collaboration with the Naval Research Laboratory to evaluate the clinical utility of semiconductor doped Vycor glass as a substitute for Lithium Fluoride (LiF) in thermoluminescence dosimetry of photon and electron beams. This project will then expand to develop a multi-fiber dosimeter reader using Vycor glass dosimeters bonded to optical fibers. This system has the advantage of providing intermittent dose and dose-rate readings and should have applications in clinical, radiation protection and environmental remote dosimetry.