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. 2013 Nov 25;60(4):145–155. doi: 10.1002/jmrs.28

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© 2013 The Authors. Journal of Medical Radiation Sciences published by Wiley Publishing Asia Pty Ltd on behalf of Australian Institute of Radiography and New Zealand Institute of Medical Radiation Technology

This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.

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(a) Transverse view of the unique shape of the planning target volume (PTV) surrounding the critical structures. The PTV45 is represented by the orange region and the PTV54 by the red. (b) The seven-field conformal beam arrangement (Phase 1). The beams for the conformal technique are 30°, 90°, 155°, 180°, 210°, 270° and 335°. Those angles marked with an asterisk (*) have been customized for each patient to follow the medial edge of the PTV45 (illustrated in orange). (c) The three-field conformal beam arrangement (Phase 2). The field angles comprised of a posterior field with 6 MV and two lateral fields with 18 MV. (d) The Andrew Love Cancer Centre IMRT beam arrangement. The beams for the conformal technique are 30°, 65°, 85°, 180°, 275°, 300° and 335°. Those angles marked with an asterisk (*) have been customized for each patient to follow the medial edge of the PTV45 (illustrated in orange).