Superficial dose distribution in breast for tangential radiation treatment, Monte Carlo evaluation of Eclipse algorithms in case of phantom and patient geometries

The accuracy of AAA in the case of the solid water phantom is comparable with that of the Monte Carlo method. The AAA-Monte Carlo differences in the patient cases considered are within 3%, 4 mm tolerance. The PBC algorithm does not give equivalent results. In the phantom case, PBC underestimates the lateral dose by more than 5% up to 8 mm depth. The PBC-Monte Carlo differences in the patient cases are outside the tolerance at the breast apex. The dimension of region varies with the breast shape being typically 8-10 mm long and 6-8 mm deep.