Quality assurance of onboard megavoltage computed tomography imaging and target localization systems for on- and off-line image-guided radiotherapy
Quality assurance of onboard megavoltage computed tomography imaging and target localization systems for on- and off-line image-guided radiotherapy
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DOI：
10.1016/j.ijrobp.2007.04.094
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发表时间：
2008-01-01
影响因子：
7
通讯作者：
Pouliot, Jean
中科院分区：
文献类型：
--
作者：
Langen, Katja M.;Meeks, Sanford L.;Pouliot, Jean
我们回顾了质量保证程序，已被用来测试风扇和锥束兆伏为基础的室内成像系统。已使用基于陀螺仪的测试来确定基于兆伏的系统的几何精度和精确度。然而，任何系统的临床实施都伴随着挑战，这些挑战最好在临床环境中使用临床图像进行测试。为了客观地判断和监测图像质量，可以使用一组标准测试和幻象。图像噪声和空间和对比度分辨率已使用标准的计算机断层扫描体模进行了评估。可以使用计算或测量来确定由成像过程导致的对患者的剂量。离线使用患者图像是感兴趣的剂量变化的评价在整个治疗过程中。基于兆伏图像的剂量计算的准确性已被测试的风扇和锥形束系统。所描述的测试中的一些通常在成像系统的临床实施之前执行;其他测试适合于监测系统的性能。(C)2008年爱思唯尔公司
We reviewed the quality assurance procedures that have been used to test fan- and cone-beam megavoltage-based in-room imaging systems. Phantom-based tests have been used to establish the geometric accuracy and precision of megavoltage-based systems. However, the clinical implementation of any system is accompanied by challenges that are best tested in a clinical setting using clinical images. To objectively judge and monitor image quality, a set of standard tests and phantoms can be used. The image noise and spatial and contrast resolution have been assessed using standard computed tomography phantoms. The dose to the patient resulting from the imaging procedure can be determined using calculations or measurements. The off-line use of patient images is of interest for the evaluation of dosimetric changes throughout the treatment course. The accuracy of the dosimetric calculations based on the megavoltage images has been tested for the fan- and cone-beam systems. Some of the described tests are typically performed before the clinical implementation of the imaging system; others are suited to monitor the system's performances. (C) 2008 Elsevier Inc.