Gunnlaugsson Adalsteinn, Persson Emilia, Gustafsson Christian, Kjellén Elisabeth, Ambolt Petra, Engelholm Silke, Nilsson Per, Olsson Lars E
Department of Hematology, Oncology and Radiation Physics, Skåne University Hospital, Lund, Sweden.
Department of Translational Sciences, Medical Radiation Physics, Lund University, Malmö, Sweden.
Phys Imaging Radiat Oncol. 2019 Mar 20;9:89-91. doi: 10.1016/j.phro.2019.03.004. eCollection 2019 Jan.
In magnetic resonance (MR) only radiotherapy, the target delineation needs to be performed without computed tomography (CT). We investigated in thirteen patients with prostate cancer, how the clinical target volume (CTV) was affected, when the target delineation procedure was changed from using both CT and MR images to using MR images only. The mean volume of the CTV was 61.0 cm as compared to 49.9 cm from MR-only based target delineation, corresponding to an average decrease of 18%. Our results show that CTV was consistently smaller than CTV, which has to be taken into consideration before clinical commissioning of MR-only radiotherapy.
在仅使用磁共振（MR）的放射治疗中，靶区勾画需要在不使用计算机断层扫描（CT）的情况下进行。我们对13例前列腺癌患者进行了研究，当靶区勾画程序从同时使用CT和MR图像改为仅使用MR图像时，临床靶区体积（CTV）受到了怎样的影响。CTV的平均体积为61.0立方厘米，而仅基于MR的靶区勾画得出的体积为49.9立方厘米，平均减少了18%。我们的结果表明，CTV始终小于[此处原文可能有误，推测应为之前的CTV]，这在仅使用MR的放射治疗临床应用前必须予以考虑。
