The primary reason why more men are choosing brachytherapy is convenience. Brachytherapy usually involves a single visit to the physician for implantation of the radioactive implants into the prostate, and then a few follow-up visits to ensure that no complications have arisen.
Alternatively, with EBRT, men must go to a radiation treatment center every day for a number of weeks (usually around seven weeks) in order to receive the appropriate dose of radiation.
Zelefsky MJ; Moughan J; Owen J; et al. Changing trends in national practice for external beam radiotherapy for clinically localized prostate cancer: 1999 Patterns of Care survey for prostate cancer. Int J Radiat Oncol Biol Phys 2004 Jul 15;59(4):1053-61.