Dosimetric influence of seed spacers and end-weld thickness for permanent prostate brachytherapy

Dosimetric perturbations of single-seed dose distributions by brachytherapy spacers exceeded 10% along the source long axes adjacent to the spacers. However, no dosimetric impact on volumetric parameters was noted for brachytherapy spacers adjacent to 103Pd, 125I, or 131Cs sources in the context of permanent prostate brachytherapy implants.