Abstract
Conclusions: VMAT SBRT for lung presents particular challenges for accurate dosimetry as it involves very small fields rapidly changing in shape within tissue where there are large density inhomogeneities. There are many factors that influence the accuracy of the dose measured compared to calculated, including MLC leaf calibration, accuracy of chamber positioning, and phantom constituents. The results presented here indicate that when simple, small phantoms are used then the dosimetric results obtained are within tolerance but as the measurements are moved to larger more complex phantoms the results move beyond acceptable limits. The semiflex chamber gave very similar results to the much smaller A16 chamber. Further work is required to understand and resolve the remaining uncertainties before this technique is used clinically.
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