Abstract
In three inhomogeneous mediums, the performance of different algorithms for Flattening Filter Free (FFF) photon beams and Flattening Filter (FF) photon beams was evaluated. The three CT image sets of the CIRS phantom, each including an ionization chamber in the lung, bone, and tissue locations, were collected using the SAD configuration. For flattened and non-flattened photon beams, the corresponding Treatment Planning System (TPS) calculated and ionization chamber measured doses in the centre of chamber (in the three mediums) were compared. In lung structure, higher deviation was recorded in 10X10 cm2 field by all the three algorithms. These deviations are larger in magnitude, both FF and FFF, compared to water and bone mediums. Thus, both FF and FFF beams performed differently in lung, water, and bone mediums. Algorithms contribute to one of the potential sources of radiation delivery uncertainty.
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