Abstract
For lung robotic radiosurgery, the Monte Carlo (MC) dose calculation is desired due to its advantage in accounting for the heterogeneous effect. It has been reported that MC calculations are sensitive to the mass density change. For example, the coverage of a plan optimized for lung density of 0.2 g/cc may drop more than 20% if the lung density is changed to 0.1 g/cc. Since the MC algorithm uses a CT curve that extrapolates data not directly measured for the low density range (e.g. 0∼ 0.2g/cc), and the corresponding electron density is always set to zero, the discrepancy may affect the accuracy of the MC dose calculation.
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