Purpose The purpose of this study was to simulate treatment planning source positioning
errors in transrectal ultrasound–based real-time high-dose-rate prostate brachytherapy
treatments and determine appropriate in vivo source tracking error thresholds. Methods and
Materials Treatment planning source positioning errors were simulated for 20 patient plans
in the brachytherapy treatment planning system by manually adjusting the dwell position
coordinates within selected catheters without plan reoptimization. The change in dose …