Quality assurance of volumetric modulated arc therapy using Elekta Synergy

Authors

  • Akihiro Haga Department of Radiology, University of Tokyo Hospital, 7-3-1 Hongo, Bunkyo-ku, Tokyo113-8655, Japan
  • Keiichi Nakagawa Department of Radiology, University of Tokyo Hospital, 7-3-1 Hongo, Bunkyo-ku, Tokyo113-8655, Japan
  • Kenshiro Shiraishi Department of Radiology, University of Tokyo Hospital, 7-3-1 Hongo, Bunkyo-ku, Tokyo113-8655, Japan
  • Saori Itoh Department of Radiology, University of Tokyo Hospital, 7-3-1 Hongo, Bunkyo-ku, Tokyo113-8655, Japan
  • Atsuro Terahara Department of Radiology, University of Tokyo Hospital, 7-3-1 Hongo, Bunkyo-ku, Tokyo113-8655, Japan
  • Hideomi Yamashita Department of Radiology, University of Tokyo Hospital, 7-3-1 Hongo, Bunkyo-ku, Tokyo113-8655, Japan
  • Kuni Ohtomo Department of Radiology, University of Tokyo Hospital, 7-3-1 Hongo, Bunkyo-ku, Tokyo113-8655, Japan
  • Shigeki Saegusa Department of Radiology, University of Tokyo Hospital, 7-3-1 Hongo, Bunkyo-ku, Tokyo113-8655, Japan
  • Toshikazu Imae Department of Radiology, University of Tokyo Hospital, 7-3-1 Hongo, Bunkyo-ku, Tokyo113-8655, Japan
  • Kiyoshi Yoda Elekta KK, Kobe, Japan
  • Roberto Pellegrini Elekta, 30 Line, Milano, Italy

DOI:

https://doi.org/10.3109/02841860903081905

Abstract

Purpose. Recently, Elekta has supplied volumetric modulated arc therapy (VMAT) in which multi-leaf collimator (MLC) shape, jaw position, collimator angle, and gantry speed vary continuously during gantry rotation. A quality assurance procedure for VMAT delivery is described. Methods and materials. A single-arc VMAT plan with 73 control points (CPs) and 5-degree gantry angle spacing for a prostate cancer patient has been created by ERGO + + treatment planning system (TPS), where MLC shapes are given by anatomic relationship between a target and organs at risk and the monitor unit for each CP is optimized based on given dose prescriptions. Actual leaf and jaw positions, gantry angles and dose rates during prostate VMAT delivery were recorded in every 0.25 seconds, and the errors between planned and actual values were evaluated. The dose re-calculation using these recorded data has been performed and compared with the original TPS plan using the gamma index. Results. Typical peak errors of gantry angles, leaf positions, and jaw positions were 3 degrees, 0.6 mm, and 1 mm, respectively. The dose distribution obtained by the TPS plan and the recalculated one agreed well under 2%-2 mm gamma index criteria. Conclusions. Quality assurance for prostate VMAT delivery has been performed with a satisfied result.

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Published

2009-01-01

How to Cite

Haga, A., Nakagawa, K., Shiraishi, K., Itoh, S., Terahara, A., Yamashita, H., … Pellegrini, R. (2009). Quality assurance of volumetric modulated arc therapy using Elekta Synergy. Acta Oncologica, 48(8), 1193–1197. https://doi.org/10.3109/02841860903081905

Issue

Vol. 48 No. 8 (2009): Acta Oncologica

Section

Articles