Gated Optical DetectorsDose Guided Radiotherapy

一种新的具有4个检测通道和所有信号处理的自选通系统已经交付使用，并达到了技术指标，消除了校准稳定性的问题。校准稳定性现在为+/-1%。NRL正在开发新的光纤，这种光纤的剂量响应将更加均匀，并将基于100微米的光纤，而不是目前的400微米模型。由此产生的系统将作为辐射剂量计进行验证，并将用于非常规临床和研究测量，涉及兆伏和千伏X射线和电子束的小场和微场剂量测量。此外，对软件的修改将允许该设备在连续采集和脉冲模式下运行。这将允许使用能量较低的X射线能量(正电压X射线和大多数近距离治疗源)进行剂量测定。这对于测量与新获得的小动物成像辐照器相关的非常小的场大小、剂量分布和输出因子是重要的。该项目暂停，等待安装新的直线加速器。

A new self-gated system with 4 detection channels and all signal processing has been delivered and performs to specifications, eliminating the problem of calibration stability. Calibration stability is now +/-1%. New fibers are being developed by NRL that will be more uniform in dose response and will be based on a 100 micron optical fiber rather than the current 400 micron model. The resulting system will undergo validation as a radiation dosimeter and will be employed for non-routine clinical and research measurements involving small field and micro-field dosimetry for both megavoltage and kilovoltage x-ray and electron beams Additionally, modification to the software will permit operation of the device in continuous acquisition as well as pulsed mode. This will permit use of the device for dosimetry with lower energy x-ray energies (orthovoltage x-rays and most brachytherapy sources). This is important for the measurement of very small field size dose distributions and output factors associated with the newly acquired small animal imaging irradiator. This project is suspended pending installation of the new linear accelerator.