['To evaluate the lung and pelvic seed migration and intraprostatic dose variability for prostate seed implant (PSI) using bio-absorbable polymer "coated" seeds for intraoperative planning.', 'A total of 100 PSI patients were initially implanted with uncoated I-125 (STM 1251 or I125-SL, N\xa0=\xa085) or Pd-103 (mod 200, N\xa0=\xa015) seeds, and 105\xa0PSI patients were implanted subsequently with coated seeds using inverse optimization with real-time planning. Implant technique, average number of needles, and dose objectives remained identical among the cohorts.', 'Day 30 postimplant comparison of seed migration demonstrated a significant reduction in overall lung and pelvic seed migration from 25% (uncoated) to 4% (coated) (p\xa0<\xa00.0001). A measurable reduction in intraprostatic dose variability was observed in patients with the coated seeds when comparing 30 days dosimetry results for V100, V150, and D90 for prostate, and V110 for the rectum. A statistically significant reduction in the standard deviation from Day 0 to Day 30 for the above parameters for the prostate as well as for V110 of rectum was also observed. A significant improvement in implant quality at Day 30 was demonstrated using Radiation Therapy Oncology Group (RTOG) evaluation criteria range with the coated seeds cohort.'] Do prostate implant dosimetric outcomes and migration patterns between bio-absorbable coated and uncoated brachytherapy seeds?