'Paris' technique implant dosimetry tables for 0.3 and 0.6 mm diameter 192Ir wire.

Abstract

Dosage and treatment volume parameters for 192Ir wire brachytherapy implants using the Paris technique (Pierquin & Dutreix, 1967; Pierquin et al, 1978) may be estimated using the “cross-line” data of Hall et al (1966) or the “escargot” curves of Schlienger et al (1970). An alternative approach using standard tables has been described for single plane and double plane (square array) implants in which absorption and scatter within the tissue and oblique absorption within the radioactive sources have been ignored (Casebow, 1984). The tables presented are therefore for general applications and are not specific to any particular source diameter, or indeed any radionuclide. This note describes a modification of the method to include oblique absorption and is therefore compartible with the “cross-line” data. Tables are given for the 0.3 mm and 0.6 mm diameter 192Ir wires currently available. In addition, two-plane triangular arrays of sources are considered and compared with square arrays. The Paris technique in...