テラハラ　アツロウ   Terahara Atsuro   寺原　敦朗    所属   東邦大学  医学部 医学科（大森病院）    職種   教授
論文種別	原著
言語種別	英語
査読の有無	査読あり
表題	Quality assurance of volumetric modulated arc therapy using Elekta Synergy.
掲載誌名	正式名：Acta oncologica (Stockholm, Sweden) 略　 称：Acta Oncol ISSNコード：0284186X/1651226X
巻・号・頁	48,pp.1193-1197
著者・共著者	Haga A, Nakagawa K, Shiraishi K, Itoh S, Terahara A†, Yamashita H, Ohtomo K, Saegusa S, Imae T, Yoda K, Pellegrini R
発行年月	2009/10
概要	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.
DOI	10.3109/02841860903081905