%0 Journal Article
%T TrueBeam Low Dose Rate Investigation for Pulsed Reduced Dose Rate IMRT
%A Mark Geurts
%J International Journal of Medical Physics,Clinical Engineering and Radiation Oncology
%P 139-149
%@ 2168-5444
%D 2017
%I Scientific Research Publishing
%R 10.4236/ijmpcero.2017.62013
%X The
capability of the TrueBeam treatment system to deliver step and shoot IMRT
plans at low dose rates was evaluated. Beam characteristics during low dose
rates (5 to 100 MU/min) were evaluated for consistency using a planar ion
chamber array. MU constancy, linearity, and beam profile symmetry were all
found to be equivalent within 0.5%. The response of the Scandi Dos Delta 4
system was also evaluated at low dose rates of using static open beams compared
to ion chamber measurements, and step and shoot IMRT plans comparing 5 - 20
MU/min and 100 MU/min dose rates, with a maximum observed absolute dose
difference of 0.8% and equivalence margin of 0.2%. The Gamma Index and
measurement reproducibility were also found to be equivalent.
%K PRDR
%K Low Dose Rate
%K Delta 4
%K TrueBeam
%U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=76293