Table 2.
Characteristics of radiotherapy
| Characteristic | HDR-BT (n = 36) | EBRT (n = 100) |
|---|---|---|
| Whole breast irradiation [Gy] | ||
| Median dose | 50.4 | 50.4 |
| Range* | 50-50.4 | 50.4-50.4 |
| Boost [Gy] | ||
| Median dose | 10 | 10 |
| Range | 8-10 | 10-10 |
| Target volume [cc] | ||
| Median | 103.61 | 131.75 |
| Range | 65.54-121.66 | 95-178.18 |
| DNR | ||
| Median | 0.3 | |
| Range | 0.23-0.35 | |
| Number of fractions (boost) | ||
| Median | 1 | 5 |
| Range | 1-1.5 | 5-5 |
| Number of needles (HDR-BT) | ||
| Median | 15 | |
| Range | 12-18 | |
| Number of planes (HDR-BT) | ||
| Median | 3 | |
| Range | 3-4 | |
| Number of fields (EBRT) | ||
| Median | 3 | |
| Range | 3-3 | |
HDR-BT – high-dose-rate interstitial brachytherapy, EBRT – external beam radiotherapy, Gy – Gray, cc – cubic centimeter, DNR – dose non-uniformity ratio
*
Range: 25th quartile – 75th quartile