Table 1.
Dosimetric parameters of 125I seed implantation using the "Ten‐step method” at 1 month and calculated BED in 137 cases
| Number of seed LDR monotherapy | n = 137 | |
|---|---|---|
| Variables | Mean (range) at seed implantation | Mean (range) at one month after seed implanation |
| Prostate D90 (Gy) | 196.2 (173–207.5) | 194.1 (156.9–223.8) |
| BED (Gy) | 209.7 (183.5–222.6) | 207.3 (165.5–241.4) |
| V100 (%) | 99.8 (98.1–100) | 99.0 (94.1–100) |
| UD30 (Gy) | 201.3 (175.1–224.2) | 211.7 (155.7–263.2) |
| R100 (cc) | 0.23 (0–1.07) | 0.47 (0–2.03) |
Average prostate volume (range) of 137 cases is 32.9 (15‐77.0) cm3. D90: minimal dose (Gy) received by 90% of the prostate. BED: biologically effective dose. V100: The percentage prostate volume receiving 100% of the prescribed minimal peripheral dose; UD30: Minimal dose (Gy) received by 30% of the urethra; R100: Rectal volume (cm3 ) receiving 100% of the prescribed dose. Average (range) of air‐kerma strength of the implanted seeds is 0.390 (U): range 0.361–0.501 (U). Average number (range) of implanted seeds is 102 (75–144).