Surface doses of flattening filter free beams with volumetric modulated arc therapy dose delivery for breast cancer  Jan Seppälä, Aleksi Voutilainen, Janne Heikkilä, Marko Vauhkonen  Physics and Imaging in Radiation Oncology  Volume 2, Pages 17-22 (March 2017) DOI: 10.1016/j.phro.2017.04.001 Copyright © 2017 The Authors Terms and Conditions

Fig. 1 Axial slice (A) and 3D-image (B) of the cylindrical phantom employed in the study. PTV (red) and critical organ (blue) were contoured on the axial slices of the CT images. The dosimetry film is shown in yellow. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.) Physics and Imaging in Radiation Oncology 2017 2, 17-22DOI: (10.1016/j.phro.2017.04.001) Copyright © 2017 The Authors Terms and Conditions

Fig. 2 The field arrangements studied were: (A) open tangential, (B) tangential IMRT, (C) tangential VMAT and (D) continuous VMAT. Physics and Imaging in Radiation Oncology 2017 2, 17-22DOI: (10.1016/j.phro.2017.04.001) Copyright © 2017 The Authors Terms and Conditions

Fig. 3 Measured dose distributions (averaged measurements) of the techniques of (A) open field, (B) IMRT, (C) tVMAT and (D) cVMAT projected onto the corresponding CT slice. As an example are the doses from the 6MV FFF energy with a dose range of 1.5–2.2Gy. Physics and Imaging in Radiation Oncology 2017 2, 17-22DOI: (10.1016/j.phro.2017.04.001) Copyright © 2017 The Authors Terms and Conditions