A dosimetric comparison between volumetric-modulated arc therapy and dynamic conformal arc therapy in SBRT

被引:8
作者
Stathakis, Sotirios [1 ]
Narayanasamy, Ganesh [1 ,2 ]
Licon, Anna Laura [1 ]
Myers, Pamela [3 ]
Li, Ying [1 ]
Crownover, Richard [1 ]
Papanikolaou, Niko [1 ]
机构
[1] Univ Texas Hlth San Antonio, Dept Radiat Oncol, Mays Canc Ctr, San Antonio, TX 78229 USA
[2] Univ Arkansas Med Sci, Dept Radiat Oncol, Little Rock, AR 72205 USA
[3] Baylor Coll Med, Houston, TX 77030 USA
来源
JOURNAL OF BUON | 2019年 / 24卷 / 02期
关键词
DCAT; Lower MUs; OAR sparing; SBRT; VMAT; RADIOTHERAPY;
D O I
暂无
中图分类号
R73 [肿瘤学];
学科分类号
100214 ;
摘要
Purpose: The purpose of this study was to investigate the dosimetric equivalency of dynamic conformal arc therapy (DCAT) against volumetric modulated arc therapy (VMAT) plans in stereotactic body radiation therapy (SBRT) of lung and liver lesions and to examine if efficiency can be increased. Methods: Nineteen patients previously treated for lung and liver cancer lesions with SBRT were included. Organs at risk (OAR) and targets were contoured by a single radiation oncologist. All plans were optimized by the same dosimetrist using ELEKTA Monaco treatment planning system version 5.0 for 6MV flattening filter free (FFF) photon beam in a VersaHD (ELEKTA, Crawley, UK). A VMAT and DCAT plan was optimized using the same objectives using coplanar arcs of 225 degrees arc span. Results: All plans have achieved the target and OAR planning objectives. The target dose conformity was comparable (mean VMAT PTVr=1.3 and DCAT PTVr=1.4), and the low dose spillage were similar (mean VMAT R50=4.5 and DCAT R50=4.6). However, monitor units (MU) for DCAT plans were lower by 2.5 times on average than VMAT plans. It was observed that in 75% of cases where OARs overlapped with the PTV, maximum doses to OAR were higher in VMAT than DCAT plans, but the difference was not significant. Patient specific quality assurance (QA) plans were measured using the Scandidos Delta4 phantom and gamma analysis performed using 2mm distance to agreement (DTA) and 2% dose difference yielded more than 95% passing rates on both VMAT and DCAT plans. Conclusions: DCAT delivery for lung and liver SBRT is a dosimetrically equivalent and an efficient alternative to VMAT plans.
引用
收藏
页码:838 / 843
页数:6
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