Table 2.
Interstitial brachytherapy application characteristics of 69 fractions
| Variable | ||
|---|---|---|
| Imaging modality during brachytherapy, n (%) | ||
| MRI | 11 (15.9) | |
| CT | 58 (84.1) | |
| Total No. of needles | 320 | |
| No. of needles per fraction, median (range) | 5 (2.0-8.0) | |
| Depth of needles (cm), median (range) | 3 (1.5-4.0) | |
| Midazolam dose (mg), mean (range) | 2.9 (0.5-5.0) | |
| Fentanyl dose (mcg), mean (range) | 59.3 (10.0-140.0) | |
| Insertion time, min., median (range) | 28.5 (9.0-85.0) | |
| Applicator type, n (%) | ||
| Interstitial ring | 10 (14.5) | |
| Utrecht | 32 (46.4) | |
| Venezia | 27 (39.1) | |
| HR-CTV at the time of first brachytherapy (cc), median (range) | 34.5 (17.8-74.7) | |
| Fractional HR-CTV D90 (Gy), median (range) | 7.8 (3.6-9.9) | |
| Fractional IR-CTV D90 (Gy), median (range) | 5.1 (2.9-7.3) | |
| Fractional rectum D2cc (Gy), median (range) | 4.4 (1.3-6.3) | |
| Fractional bladder D2cc (Gy), median (range) | 5.3 (3.3-7.1) | |
| Fractional sigmoid D2cc (Gy), median (range) | 4.1 (2.3-5.8) | |
| Fractional small intestine D2cc (Gy), median (range) | 3.4 (1.3-6.2) | |
| Total EQD2 HR-CTV D90 (Gy), median (range) | 86.1 (76.3-93.1) | |
| Total EQD2 IR-CTV D90 (Gy), median (range) | 68.3 (62.2-76.5) | |
| Total EQD2 rectum D2cc (Gy), median (range) | 71.8 (63.0-76.0) | |
| Total EQD2 bladder D2cc (Gy), median (range) | 81.5 (54.8-88.4) | |
| Total EQD2 sigmoid D2cc (Gy), median (range) | 69.0 (48.4-75.0) | |
| Total EQD2 small intestine D2cc (Gy), median (range) | 58.3 (48.4-73.1) | |
HR-CTV – high-risk clinical target volume, IR-CTV – intermediate-risk clinical target volume