Dosimetric Errors of TPS Calculations without Correction for Heterogeneity -A Study Using CIRS Thorax Phantom

摘要

The magnitude of the error in dose calculation using a commercial treatment planning system (TPS) without correction for tissue heterogeneity was assessed. A CIRS Thorax anthropomorphic phantom was used for the study. The phantom was CT scanned, treatment planned and treated with 10 M V photon beams. Dose at points of interested in the phantom was measured and compared with TPS calculation. Significant discrepancies of up to 8% between calculated and measured doses were observed. The results of our experiment indicate that treatment planning with TPS without correction for tissue heterogeneity should be avoided.