Dosimetric Evaluation of a Computed Tomography Treatment System

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Abstract
Pixel-by-pixel correction for tissue inhomogeneities was performed with a CT[computed tomography]-interfaced treatment [human] planning system. The CT number for each pixel was converted to a physical density. Comparison of the resulting data with dose measurements in a RANDO phantom shows that pixel calculation overestimates dose by 5-7% at locations adjoining the lung, where loss of scatter is not taken into account by the algorithm. The new system does have some advantages over conventional treatment planning systems.