. Three analyses were performed: 1) mean volume receiving doses>95% and>105%; according to the percentage of prescribed dose to cover at least 95% of the planning target volume, the treatment plan was defined as optimal dose>95%, acceptable dose between 95% and 90%, inferior dose<90%; 2) comparison of the percentage of volume covered by the dose for 2- vs 3-dimensional; 3) determination of the doses at which the lack of volume coverage started to decrease significantly.