4D cone beam CT phase sorting using high frequency optical surface measurement during image guided radiotherapy
4D cone beam CT phase sorting using high frequency optical surface measurement during image guided radiotherapy
复制标题
在图像引导放射治疗期间使用高频光学表面测量进行 4D 锥形束 CT 相位排序
DOI：
10.1117/12.877637
复制
发表时间：
2011
期刊：
影响因子：
3.8
通讯作者：
Cj Moore
中科院分区：
文献类型：
--
作者：
GJ Price;T. Marchant;JM Parkhurst;PJ Sharrock;GA Whitfield;Cj Moore
在图像引导放射治疗（IGRT）中，两个最有前途的最新发展是四维锥形束CT（4D CBCT）和患者表面的动态光学计量。4D CBCT现在已经商业化，并可用于治疗计划和验证，虽然光学监测是一项年轻的技术，但其在治疗过程中进行测量而不产生剂量后果的能力已被许多研究所采用。在本文中，我们演示了使用动态的患者表面，同时捕获CBCT采集过程中使用的光学传感器，相位排序投影图像的4D CBCT体积重建。我们描述的双模态方法意味着除了4D体积数据之外，该系统还提供了具有高空间和时间分辨率的患者皮肤表面的相关宽场测量。除了在验证和运动分析研究中这种补充数据的价值外，它还为相位分选所需的信号采集带来了灵活性。所使用的具体技术可以根据个体患者情况和成像目标而变化。我们详细介绍了三种不同的方法，从光学表面获得合适的信号：简单地遵循三角测量点的运动，用于校准表面的绝对高度;监测表面高度在一个单一的，任意选择的，相机像素;和跟踪，在三维空间中，运动的表面特征。除了描述的系统和方法，我们目前的初步结果，从一个案例研究食管癌患者。
In image guided radiotherapy (IGRT) two of the most promising recent developments are four dimensional cone beam CT (4D CBCT) and dynamic optical metrology of patient surfaces. 4D CBCT is now becoming commercially available and finds use in treatment planning and verification, and whilst optical monitoring is a young technology, its ability to measure during treatment delivery without dose consequences has led to its uptake in many institutes. In this paper, we demonstrate the use of dynamic patient surfaces, simultaneously captured during CBCT acquisition using an optical sensor, to phase sort projection images for 4D CBCT volume reconstruction. The dual modality approach we describe means that in addition to 4D volumetric data, the system provides correlated wide field measurements of the patient's skin surface with high spatial and temporal resolution. As well as the value of such complementary data in verification and motion analysis studies, it introduces flexibility into the acquisition of the signal required for phase sorting. The specific technique used may be varied according to individual patient circumstances and the imaging target. We give details of three different methods of obtaining a suitable signal from the optical surfaces: simply following the motion of triangulation spots used to calibrate the surfaces' absolute height; monitoring the surface height in a single, arbitrarily selected, camera pixel; and tracking, in three dimensions, the movement of a surface feature. In addition to describing the system and methodology, we present initial results from a case study oesophageal cancer patient.
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DOI：
10.1007/978-1-4939-7647-8_1
发表时间：
2018
期刊：
Neuromethods
影响因子：
--
作者：
Joshi,AnandA
通讯作者：
Joshi,AnandA