PLASTIC SCINTILLATOR AS A DOSIMETER IN RADIOTHERAPY

作为剂量计算，高能治疗机， 放射疗法中的治疗技术变得更加复杂， 目前需要开发一种实用的区域剂量计 具有足够的精度和分辨率，可快速采集 剂量测定数据。 胶片剂量测定是不够的，因为它的穷人 精确度，而电离剂量测定是耗时的。 一种新型 提出了一种用塑料闪烁体进行面剂量测量的方法 这里. 塑料闪烁体作为剂量计具有吸引人的品质 因为它的水状属性。 高辐射强度 在放射治疗中可用，使得有可能获得剂量测定 使用摄像机从塑料闪烁体片获得数据， 查看闪烁灯。 我们的长期目标是开发一种实用的剂量计 系统能够进行精确的面积测量，根据一个 通过摄像机观察塑料闪烁体片，摄像机的输出 通过计算机进行采集和分析。 A原型数据 采集系统已组装的初步研究， 外光子和电子剂量学。 这些最近 结果令人鼓舞，并证明了 approach. 作为该系统开发的下一步，我们 建议（1）设计和建造水箱剂量测量系统 基于用于外部光子的塑料闪烁体片， 电子束剂量学研究;（2）开发仪器作为 通过研究仪器伪影的定量剂量测定系统 和基本物理;（3）表征的性质， 剂量测定系统在剂量测量精度方面， 决议等;（4）使用该系统进行可行性研究， 近距离放射治疗剂量测定应用。

As dose calculations, high energy treatment machines, and treatment techniques in radiotherapy become more sophisticated, there is a need at present to develop a practical areal dosimeter of sufficient accuracy and resolution for rapid acquistion of dosimetric data. Film dosimetry is inadequate because of its poor precision while ionization dosimetry is timeconsuming. A novel approach to areal dosimetry using plastic scintillator is proposed here. Plastic scintillator has appealing qualities as a dosimeter because of its waterlike properties. The high radiation intensity available in radiotherapy makes it possible to obtain dosimetric data from a sheet of plastic scintillator using a video camera to view the scintillation light. Our long term objective is to develop a practical dosimeter system capable of making precise areal measurements, based on a plastic scintillator sheet viewed by a video camera whose output is acquired and analyzed by computer. A prototype data acquisition system has been assembled for preliminary studies of external photon and electron been dosimetry. These recent results are encouraging, and demonstrate the feasibility of the approach. As the next step in the development of this system, we propose to (1) design and build a water tank dosimetry system based on a plastic scintillator sheet for external photon and electron beam dosimetric studies; (2) develop the instrument as a quantitative dosimetry system by studying instrument artifacts and the underlying physics; (3) characterize the properties of the dosimetry system in terms of precision of dose measurement, resolution, etc; and (4) use the system for feasibility studies in brachytherapy dosimetery applications.