Comparison of multiparametric MRI-based and transrectal ultrasound-based preplans with intraoperative ultrasound-based planning for low dose rate interstitial prostate seed implantation.

While prostate volume obtained with pTRUS consistently correlated with real‐time intraoperative prostate volume measurements, as well as with those on postoperative CT ( P = 0.19; correlation coefficient r = 0.98; Figure 4 ), there was a significant difference between intraoperative and postoperative‐based calculations of prostate V 100 ( P < 0.001), V 150 (approaching significance, P = 0.08) V 200 ( P = 0.03), and rectal D 1 cc ( P < 0.01), with postoperative dosimetric values higher than intraoperative measurements.

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