<abstract xmlns="http://www.w3.org/1999/xhtml"><sec id="j_raon-2017-0005_s_001_w2aab3b8c23b1b7b1aab1c16b1Aa"><h3>Background</h3><p>The aim of this study was to determine the optimal strategy among various arc arrangements in prostate plans of stereotactic body radiotherapy with volumetric modulated arc therapy (SBRT-VMAT).</p></sec><sec id="j_raon-2017-0005_s_002_w2aab3b8c23b1b7b1aab1c16b2Aa"><h3>Patients and methods</h3><p>To investigate how arc arrangements affect dosimetric and biological metrics, SBRT-VMAT plans for eighteen patients were generated with arrangements of single-full arc (1FA), single-partial arc (1PA), double-full arc (2FA), and double-partial arc (2PA). All plans were calculated by the Acuros XB calculation algorithm. Dosimetric and radiobiological metrics for target volumes and organs at risk (OARs) were evaluated from dosevolume histograms.</p></sec><sec id="j_raon-2017-0005_s_003_w2aab3b8c23b1b7b1aab1c16b3Aa"><h3>Results</h3><p>All plans were highly conformal (CI&lt;1.05, CN=0.91) and homogeneous (HI=0.09-0.12) for target volumes. For OARs, there was no difference in the bladder dose, while there was a significant difference in the rectum and both femoral head doses. Plans using 1PA and 2PA showed a strong reduction to the mean rectum dose compared to plans using 1FA and 2FA. Contrastively, the D<sub>2%</sub> and mean dose in both femoral heads were always lower in plans using 1FA and 2FA. The average tumor control probability and normal tissue complication probability were comparable in plans using all arc arrangements.</p></sec><sec id="j_raon-2017-0005_s_004_w2aab3b8c23b1b7b1aab1c16b4Aa"><h3>Conclusions</h3><p>The use of 1PA had a more effective delivery time and produced equivalent target coverage with better rectal sparing, although all plans using four arc arrangements showed generally similar for dosimetric and biological metrics. However, the D<sub>2%</sub> and mean dose in femoral heads increased slightly and remained within the tolerance. Therefore, this study suggests that the use of 1PA is an attractive choice for delivering prostate SBRT-VMAT.</p></sec></abstract>

BackgroundThe aim of this study was to determine the optimal strategy among various arc arrangements in prostate plans of stereotactic body radiotherapy with volumetric modulated arc therapy (SBRT-VMAT).Patients and methodsTo investigate how arc arrangements affect dosimetric and biological metrics, SBRT-VMAT plans for eighteen patients were generated with arrangements of single-full arc (1FA), single-partial arc (1PA), double-full arc (2FA), and double-partial arc (2PA). All plans were calculated by the Acuros XB calculation algorithm. Dosimetric and radiobiological metrics for target volumes and organs at risk (OARs) were evaluated from dosevolume histograms.ResultsAll plans were highly conformal (CI<1.05, CN=0.91) and homogeneous (HI=0.09-0.12) for target volumes. For OARs, there was no difference in the bladder dose, while there was a significant difference in the rectum and both femoral head doses. Plans using 1PA and 2PA showed a strong reduction to the mean rectum dose compared to plans using 1FA and 2FA. Contrastively, the D2% and mean dose in both femoral heads were always lower in plans using 1FA and 2FA. The average tumor control probability and normal tissue complication probability were comparable in plans using all arc arrangements.ConclusionsThe use of 1PA had a more effective delivery time and produced equivalent target coverage with better rectal sparing, although all plans using four arc arrangements showed generally similar for dosimetric and biological metrics. However, the D2% and mean dose in femoral heads increased slightly and remained within the tolerance. Therefore, this study suggests that the use of 1PA is an attractive choice for delivering prostate SBRT-VMAT.

Optimal planning strategy among various arc arrangements for prostate stereotactic body radiotherapy with volumetric modulated arc therapy technique

Research Institute of Biomedical Engineering

Department of Biomedical Engineering, College of Medicine

Department of Radiation Oncology, Haeundae Paik Hospital

Radiology and Oncology

This article is distributed under the terms of the Creative Commons Attribution Non-Commercial License, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

BackgroundThe aim of this study was to determine the optimal strategy among various arc arrangements in prostate plans of stereotactic body radiotherapy with...

Optimal planning strategy among various arc arrangements for prostate stereotactic body radiotherapy with volumetric modulated arc therapy technique

Article Category: Research Article

Publié en ligne: 15 janv. 2017

Pages: 112 - 120

Reçu: 19 juil. 2016

Accepté: 25 oct. 2016

DOI: https://doi.org/10.1515/raon-2017-0005

© 2017 Sang Won Kang, Jin Beom Chung, Jae Sung Kim, In Ah Kim, Keun Yong Eom, Changhoon Song, Jeong Woo Lee, Jin Young Kim, Tae Suk Suh

This article is distributed under the terms of the Creative Commons Attribution Non-Commercial License, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.