Incorporating system latency associated with real-time target tracking radiotherapy in the dose prediction step.
Incorporating system latency associated with real-time target tracking radiotherapy in the dose prediction step.
复制标题
在剂量预测步骤中纳入与实时目标跟踪放射治疗相关的系统延迟。
DOI：
10.1088/0031-9155/55/9/015
复制
发表时间：
2010
影响因子：
3.5
通讯作者：
Papanikolaou,Nikos
中科院分区：
文献类型：
--
作者：
Roland,Teboh;Mavroidis,Panayiotis;Shi,Chengyu;Papanikolaou,Nikos
System latency introduces geometric errors in the course of real-time target tracking radiotherapy. This effect can be minimized, for example by the use of predictive filters, but cannot be completely avoided. In this work, we present a convolution technique that can incorporate the effect as part of the treatment planning process. The method can be applied independently or in conjunction with the predictive filters to compensate for residual latency effects. The implementation was performed on TrackBeam (Initia Ltd, Israel), a prototype real-time target tracking system assembled and evaluated at our Cancer Institute. For the experimental system settings examined, a Gaussian distribution attributable to the TrackBeam latency was derived with σ= 3.7 mm. The TrackBeam latency, expressed as an average response time, was deduced to be 172 ms. Phantom investigations were further performed to verify the convolution technique. In addition, patient studies involving 4DCT volumes of previously treated lung cancer patients were performed to incorporate the latency effect in the dose prediction step. This also enabled us to effectively quantify the dosimetric and radiobiological impact of the TrackBeam and other higher latency effects on the clinical outcome of a real-time target tracking delivery.
