Coffey Ashley, Renucci Lisa, Hunzeker Ashley, Lenards Nishele
Medical Dosimetry Program at University of Wisconsin, La Crosse, WI.
Medical Dosimetry Program at University of Wisconsin, La Crosse, WI.
Med Dosim. 2017;42(3):185-189. doi: 10.1016/j.meddos.2017.02.007. Epub 2017 May 31.
The purpose of this study was to compare the variations in doses to the ipsilateral lung and heart between the supine whole breast and nodal volumetric-modulated arc therapy (VMAT) technique and the prone 3-dimensional conformal radiation therapy (3DCRT) technique. In this study, 3 patients who were simulated in the prone and supine positions were planned using supine VMAT and prone 3DCRT techniques to compare planning target volume (PTV) coverage as well as dose to organs at risk (ORs), including the heart and ipsilateral lung. Although all constraints were met, the ideal treatment technique depended on the patient's anatomy and lumpectomy location. Supine VMAT provided excellent coverage to the target structures but encountered difficulty in limiting dose to the ipsilateral lung and heart. When compared with the supine VMAT technique, the prone 3DCRT limited dose to the ipsilateral lung and heart but provided less dose coverage to the target volumes.
本研究的目的是比较仰卧位全乳及淋巴结容积调强弧形放疗（VMAT）技术与俯卧位三维适形放疗（3DCRT）技术对同侧肺和心脏的剂量差异。在本研究中，对3例在俯卧位和仰卧位进行模拟的患者，分别采用仰卧位VMAT技术和俯卧位3DCRT技术进行计划，以比较计划靶区（PTV）的覆盖情况以及对包括心脏和同侧肺在内的危及器官（OR）的剂量。尽管所有限制条件均得到满足，但理想的治疗技术取决于患者的解剖结构和保乳手术位置。仰卧位VMAT对靶结构的覆盖良好，但在限制对同侧肺和心脏的剂量方面存在困难。与仰卧位VMAT技术相比，俯卧位3DCRT对同侧肺和心脏的剂量限制较好，但对靶区的剂量覆盖较少。
