✍ Scribed by J.R. Cunningham; P.N. Shrivastava; J.M. Wilkinson
No coin nor oath required. For personal study only.
Program IRREG is used to calculate dose rate and percentage depth doses at any number of selected points in a a patient irradiated by a single irregularly shaped beam. The primary and scatter components of the dose are computed separately and then added. Both are computed by a sector integration method; the scatter calculation uses scatterair ratios; the primary calculation uses zero-area tissue-air ratios and an extended source model. A correction is made for surface curvature, but not for tissue heterogeneity. The program is designed to run on a commercial timesharing system.
** Strictly speaking, this definition of the reference dose, and this definition of tissue-air ratio become more and more difficult to apply literally as the radiation energy is increased. The formalism however may be retained even if a different reference dose is used. The denominator in eq. ( ) serves only as a scaling factor.
📜 SIMILAR VOLUMES