REAL TIME CAMERA FOR DOSE AND DENSITY SPATIAL PROFILES

一种新型的X射线照相机已经开发出来，它具有潜在的 能够同时测量真实的剂量和密度 在接受放射治疗的患者中被照射的身体元素的空间分布 放射治疗 摄像机位于非侵入性位置 并检测从患者散射的光子 身体 摄像系统由一个带槽的紧凑型腔室组成 在相机入口平面的光圈，和100 X射线阵列 摄像机图像平面上的探测器。 每一个探测器测量的X射线 从相应的体积元素发射的信号， 病人的身体。 因此，由100个测量器测量的信号 检测器可以提供关于光的空间分布的信息， 患者身体的受照射体积元素中的剂量和密度。 本提案的目的是证明，通过适当的校准， 的检测器阵列，相机系统可以作为一个在线的，非 有创剂量和密度分布实时测量系统 在受辐射的身体元素中。 校准将使用 不同尺寸的水模型和选择的X射线，伽马射线， 高能电子或高能质子治疗束。

A new type of X-ray camera has been developed which has the potential capability of simultaneously measuring in real time the dose and density spatial profiles of irradiated body elements in a patient undergoing radiation therapy. The camera is positioned in a non-invasive position on the patients side and detects photons scattered from the patients body. The camera system consists of a compact chamber with a slot aperture at the camera entrance plane, and an array of 100 X-ray detectors at the camera image plane. Each detector measures the X-ray signal emitted from a corresponding volume element that is irradiated in the patients body. Accordingly, the signals measured by the 100 detectors can provide information about the spatial distribution of the dose and density in the irradiated volume elements of the patients body. The goal of this proposal is to demonstrate that with proper calibration of the detector array, the camera system can function as an on-line, non- invasive, real-time measuring system of the dose and density distribution in irradiated body elements. The calibration would be carried out with different sizes of water phantoms and with selected X-ray, gamma-ray, high energy electron, or high-energy proton therapy beams.