Degree Name

Master of Philosophy


School of Physics


Volumetric Modulated Arc Therapy (VMAT) is a new type of Intensity Modulated Radiation Therapy (IMRT) technique as it can deliver a more accurate shape of sculpted 3D dose distribution to the targeted tumour volume in a single 360 degree gantry rotation or multiple sub-arcs. This improvement, however, has not mitigated the problem of doses to normal tissues outside the treated volume. The out-of-field dose associated risks remains high clinical and scientific interests for investigations. A re-evaluation of the eye lens radio-sensitivity by the ICRP 2011 has resulted in a significant reduction of the threshold for lens opacities from 8 Gy to 0.5 Gy. The objective of this thesis study is to investigate the out-of-field doses to critical structures such as eye lens and CIEDs (cardiac implantable electronic devices) such as pacemakers and ICDs during 6 MV VMAT treatment of the prostate.



Unless otherwise indicated, the views expressed in this thesis are those of the author and do not necessarily represent the views of the University of Wollongong.