Table 1.
Patient characteristics
| Factors | ||
|---|---|---|
| Sex | Male | 18 |
| Female | 2 | |
| Age (years) | Median (range) | 62 (46–71) |
| Location (lobe) | Right upper | 10 |
| Right middle | 1 | |
| Right lower | 5 | |
| Left upper | 3 | |
| Left lower | 1 | |
| Clinical stage | IIIA | 8 |
| IIIB | 12 | |
| Radiotherapy sequence | CFRT before SBRT boost | 3 |
| CFRT after SBRT boost | 17 | |
| PTVPT volume (cc) | Median (range) | 30.7 (10.9–100.1) |
| PTVLN volume (cc) | Median (range) | 199.5 (24.8–452.3) |
| Min distance(PT to LN) (cm) | Median (range) | 4.0 (1.2–7.1) |
| Overlapping slices thickness(PT and LN) (cm) | Median (range) | 1.9 (-4.5–6.1) |
| Volume ratio(LN to total lung) | Median (range) | 0.07 (0.01–0.14) |
| Volume ratio(LN to ipsilateral lung) | Median (range) | 0.12 (0.02–0.30) |
| Min distance(PT to ESO) (cm) | Median (range) | 5.83 (0.89–10.47) |
| Volume ratio of overlapping structure(ESO and LN) to ESO | Median (range) | 0.32 (0.00–0.87) |
| Min distance(PT to heart) (cm) | Median (range) | 4.27 (1.11–7.58) |
| Volume ratio of overlapping structure(heart and LN) to heart | Median (range) | 0.02 (0.00–0.05) |
| Volume ratio of overlapping structure(heart and LN) to PTVLN | Median (range) | 0.07 (0.01–0.24) |
To make the presentation more concise, PT represented PTVPT, LN represented PTVLN, ESO represented esophagus, CFRT represented conventional fraction radiotherapy, and SBRT represented stereotactic body radiotherapy. The explanation of each anatomical geometric parameter could be referred to Fig. 1