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

  • Sang-Won Kang The Catholic University of Korea
  • Jin-Beom Chung Seoul National University Bundang Hospital
  • Jae-Sung Kim Seoul National University Bundang Hospital
  • In-Ah Kim Seoul National University Bundang Hospital
  • Keun-Yong Eom Seoul National University Bundang Hospital
  • Changhoon Song Seoul National University Bundang Hospital
  • Jeong-Woo Lee Konkuk University Medical center
  • Jin-Young Kim Haeundae Paik Hospital
  • Tae Suk Suh The Catholic University of Korea

Abstract

Backgorund. 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).

Materials and Methods. 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 radiobiogical metrics for target volumes and organs at risk (OARs) were evaluated from dose-volume histograms.

Results. All 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.

Conclusions. 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 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.

Key words: stereotactic body radiotherapy; volumetric modulated arc therapy; prostate cancer; arc arrangement; dosimetric and biological metrics

Author Biographies

Sang-Won Kang, The Catholic University of Korea
Department of Biomedical Engineering
Jin-Beom Chung, Seoul National University Bundang Hospital
Deparment of Radiation Oncology
Jae-Sung Kim, Seoul National University Bundang Hospital
Deparment of Radiation Oncology
In-Ah Kim, Seoul National University Bundang Hospital
Deparment of Radiation Oncology
Keun-Yong Eom, Seoul National University Bundang Hospital
Deparment of Radiation Oncology
Changhoon Song, Seoul National University Bundang Hospital
Deparment of Radiation Oncology
Jeong-Woo Lee, Konkuk University Medical center
Deparment of Radiation Oncology
Jin-Young Kim, Haeundae Paik Hospital

Deparment of Radiation Oncology

Tae Suk Suh, The Catholic University of Korea
Department of Biomedical Engineering
Published
2017-02-28
How to Cite
Kang, S.-W., Chung, J.-B., Kim, J.-S., Kim, I.-A., Eom, K.-Y., Song, C., Lee, J.-W., Kim, J.-Y., & Suh, T. S. (2017). Optimal planning strategy among various arc arrangements for prostate stereotactic body radiotherapy with volumetric modulated arc therapy technique. Radiology and Oncology, 51(1). Retrieved from https://radioloncol.com/index.php/ro/article/view/2662
Section
Medical Physics