Has anyone tried using 2 180 degrees arcs vs one full arc for lung VMAT SBRT? Can anyone see any advantage? I have heard in some discussions that it might confer some benefits but I am trying to wrap my head around it and cant see it immediately.
With lung VMAT SBRT there is little advantage in using a 360 degree arc as you will be unnecessarily irradiating the contralateral lung. A half arc should suffice.
I am agree with your answer, with my small experience in this technique i now that is better two semi arc inclusive for the dose distribution with different speed of the linac for delivery the dose and with two semi-arc reduce the dose in the contralateral lung.
As above.
We use 2 partial ipsilateral arcs, for a total of about 200 degrees, as a starting point...
Many thanks for all your responses. Can anyone point to a study on this?
Hi Shahin
I have just published an article on full arc, vs parital vs non-coplanar arc for lung SBRT VMAT. http://onlinelibrary.wiley.com/doi/10.1002/jmrs.156/abstract
Thanks Rhys
hi read this article i think will be useful for you
http://iopscience.iop.org/article/10.1088/0031-9155/58/4/749/pdf
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