Extracapsular radiation dose distribution after permanent prostate brachytherapy.
The physical extent of the radiation therapy dose delivered to the periprostatic region was evaluated in 26 consecutive patients with low-risk prostate cancer (prostate-specific antigen or=5.0 mm for all slices evaluated. The utilization of preplanning periprostatic margins is strongly correlated with the administration of prescription radiation doses to the periprostatic region. The extent of the postimplant periprostatic margin (6.5 +/- 1.8 mm) satisfies the preplanning margin criterion of >5 mm.
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