Abstract
We treated 65 patients, from October 2003 to October 2004, with I-125 prostate brachytherapy who had prostate confined adenocarcinoma. Thirty-one patients had pre-implant CT on the day before prostate implantation. We compared pre-implant prostate volume by TRUS and CT. Eighteen patients had hormonal therapy at least 3 months before the volume study by TRUS. Average prostate volume by TRUS and CT were 23.74 (9.0-39.63) cm3, and 24.23 (9.36-41.38) cm3. The average differences of prostate volume by the two modalities in each patient were 1.26 (0.05-3.49) cm3, and the median differences were 0.99 cm3. There was no definite difference between the two modalities. The median number of seeds that were planned by TRUS volume study and CT volume study were 64 (range 46-85), and 65 (range 45-86) respectively. The average differences of the number of seeds by the two modalities in each patient was 0.6 (range 0-4). We believe the volume study by CT can be used as substitute for an ordinary volume study by TRUS.
