Korol Renee M, Surry Kathleen, Davidson Melanie T M, Yartsev Slav, Rodrigues George, D'Souza David P
Department of Medical Physics, Odette Cancer Centre, Toronto, Ontario, Canada.
Brachytherapy. 2010 Jul-Sep;9(3):278-81. doi: 10.1016/j.brachy.2009.07.008. Epub 2010 Mar 1.
We present a method of three-dimensional image-based planning for cervix high-dose-rate (HDR) brachytherapy for patients with bilateral metal hip prostheses using megavoltage computed tomography (MVCT) imaging.
Two patients with bilateral metal hip prostheses were treated with our standard HDR brachytherapy fractionation and critical structure tolerance limits for cervical cancer. MVCT imaging was used for treatment planning because of artifacts present in kilovoltage computed tomography (kVCT), which did not allow visualization of the organs of interest.
The MVCT images provided adequate contrast to allow the contouring of organs at risk and the digitization of HDR applicators. HDR brachytherapy treatment planning was successfully accomplished based on MVCT images for 2 patients with bilateral metal hip prostheses.
Using MVCT imaging eliminated streak artifacts, which improved the image quality for treatment planning. MVCT offers an option for three-dimensional planning for cervix brachytherapy in patients with bilateral hip prostheses.
我们提出一种基于三维图像的计划方法，用于使用兆伏级计算机断层扫描（MVCT）成像对双侧金属髋关节假体患者进行子宫颈高剂量率（HDR）近距离放射治疗。
两名双侧金属髋关节假体患者接受了我们针对宫颈癌的标准HDR近距离放射治疗分次方案和关键结构耐受限度。由于千伏级计算机断层扫描（kVCT）中存在伪影，无法清晰显示感兴趣的器官，因此使用MVCT成像进行治疗计划。
MVCT图像提供了足够的对比度，以便能够勾勒出危及器官的轮廓并对HDR施源器进行数字化处理。基于MVCT图像，成功完成了两名双侧金属髋关节假体患者的HDR近距离放射治疗计划。
使用MVCT成像消除了条纹伪影，提高了治疗计划的图像质量。MVCT为双侧髋关节假体患者的子宫颈近距离放射治疗提供了三维计划的选择。
