Does the Choice of Isotope, Co60 or Ir192, Affect Treatment Planning Techniques and Outcomes for High Dose Rate (HDR) Brachytherapy?

Abstract

reduced no. Co-60 dwells in ring 1.3 -1.1 -4.5 0.0 -5.2 4.3 -3.8 4.1 0.0 reduced no. Co-60 dwells in ring & IUT 5.3 -9.7 0.0 3.2 0.0 4.3 -3.8 -12.2 1.5 Table 1. Percentage difference in GEC-ESTRO and ICRU dose reporting indices between treatment plans created with Co-60 and Ir-192 sources. Mean and standard deviation results are presented for a consecutive series of 8 clinical treatment plans prescribed to ICRU Point A and then to HR-CTV. Results of modified loading for Co-60, to reduce rectal dose, compared to conventional loading with Ir-192, prescribed to Point A, are also presented. Fig 2. Percentage difference in dose distribution between nonstandard dwell position loading for Co-60, to minimise rectal dose, compared to conventional loading for Ir-192, both prescribed to ICRU Point A