Table 2.
Median (min-max) values for DVH metrics evaluated for all regions of interest (ROI). For CTVs, the values not meeting the clinical goal are highlighted in red.
| ROI | DVH Metric | Clin. Goal | Base Plan (BP) | OA with CBCT (No Offset) | OA with CT-on-Rails | ||
|---|---|---|---|---|---|---|---|
| σ 1 | σ 2 | σ 3 | |||||
| High-risk CTV |
D98 (%) D2 (%) |
≥95 ≤107 |
94.5 (90.7–99.1) 103.2 (102.3–106.8) |
98.1 (96.7–99.6) 102.4 (102.0–103.2) |
97.8 (95.9–99.5) 102.2 (101.6–103.1) |
97.1 (95.2–98.9) 102.1 (101.4–102.9) |
95.5 (92.4–97.8) 101.8 (100.8–102.8) |
| Low-risk CTV | D98 (%) | ≥95 | 95.2 (91.3–97.1) | 98.2 (96.7–99.6) | 97.6 (95.9–99.4) | 97.2 (95.7–98.7) | 95.2 (92.3–97.2) |
| Larynx | Dmean (Gy) | <40 | 23.6 (5.9–36.1) | 23.1 (6.4–35.0) | 23.5 (6.5–35.1) | 22.6 (6.4–35.2) | 22.7 (7.3–33.4) |
| Right parotid |
Dmean (Gy) | <26 * | 18.7 (12.5–56.0) | 18.7 (13.1–55.2) | 18.4 (13.2–55.1) | 18.7 (13.3–55.0) | 18.8 (13.6–55.6) |
| Left parotid |
Dmean (Gy) | <26 * | 18.4 (10.6–52.0) | 18.6 (10.4–52.1) | 18.6 (10.7–52.1) | 19.3 (10.3–52.0) | 19.2 (11.6–52.6) |
| Constrictors | Dmean (Gy) | <42 ** | 29.7 (8.9–59.5) | 29.7 (8.6–59.6) | 29.9 (8.6–59.6) | 29.9 (8.7–59.5) | 29.8 (9.4–58.9) |
| Spinal cord | D1cc (Gy) | <45 | 12.2 (6.8–24.6) | 12.4 (7.3–24.0) | 12.5 (7.3–24.2) | 12.9 (7.4–24.5) | 13.1 (8.2–24.7) |
| Healthy tissue | D V (Gy L) | - | 48.7 (40.7–84.1) | 49.8 (41.4–84.9) | 49.7 (41.4–84.9) | 49.7 (41.4–84.8) | 49.6 (41.5–85.1) |
* No constraint applied for 2 patients due to the proximity to CTVs; ** No constraint applied for 1 patient due to the proximity to CTVs.