THE COUPLING OF ANISOTROPY AND RADIAL DOSE FUNCTIONS FOR PD-103 AND I-125 FOR USE WITH A COMMERCIAL TREATMENT PLANNING SYSTEM

Many commercial treatment planning systems available today employ trad itional dose calculation formulae in their interstitial brachytherapy source calculation algorithms. The 1995 AAPM report on interstitial br achytherapy source dosimetry recommended a new dose calculational form alism and presented a technique for adopting it on systems which embod y traditional formalism. In order to comply with these recommendations on our system, the transformations for implementing a one dimensional isotropic point source model were modified by coupling the published anisotropy and radial dose corrections and fitting them to a fifth ord er polynomial. Using this approach, a more accurate dose calculation i s obtained.