Table 1 Means ± standard deviations per patient of shifts in direction of 3 axes on standard breastboard vs crawl couch (comparative group) (in mm).
From: Crawl positioning improves set-up precision and patient comfort in prone whole breast irradiation
Patient | AP | LL | CC | |||
|---|---|---|---|---|---|---|
Standard | Crawl | Standard | Crawl | Standard | Crawl | |
1 | − 3.8 ± 3.8 | − 1.3 ± 0.8 | − 2.3 ± 5.4 | − 2.6 ± 2.3 | − 0.7 ± 2.2 | − 1.4 ± 2.8 |
2 | 5.1 ± 2.3 | − 6.7 ± 2.7 | − 1.7 ± 5.5 | 4.2 ± 3.5 | 2.4 ± 3.6 | − 0.3 ± 3.1 |
3 | − 1.7 ± 3.7 | 0 ± 3.2 | 0 ± 9.8 | 0.1 ± 1.7 | 0.7 ± 6.2 | − 0.7 ± 2.8 |
4 | 1.2 ± 2.0 | − 2.6 ± 2.5 | 21.5 ± 3.3 | 0.6 ± 3.9 | 0.7 ± 2.1 | − 3 ± 2.8 |
5 | − 2.9 ± 3.2 | − 1.7 ± 2.7 | − 3.7 ± 8.9 | − 2.5 ± 2 | 5.1 ± 2.3 | − 0.5 ± 2.4 |
6 | 0.7 ± 1.3 | 4.5 ± 2.3 | 0.3 ± 3.1 | 1.2 ± 2.9 | − 3.7 ± 1.3 | 5.2 ± 1.3 |
7 | − 0.7 ± 2.5 | − 0.3 ± 1.7 | 7.7 ± 4.1 | − 4.4 ± 2.1 | 0.3 ± 2.3 | 2.1 ± 4.9 |
8 | − 2.3 ± 4.2 | − 0.5 ± 5.8 | 8 ± 3.1 | − 2.2 ± 2.3 | − 2.1 ± 3.6 | − 5.3 ± 3.2 |
9 | − 0.1 ± 2.9 | 1.7 ± 2.9 | − 2.6 ± 12.5 | 0.3 ± 1.4 | − 10.9 ± 3.1 | − 15.8 ± 1.8 |
10 | − 4.0 ± 4.0 | 4.7 ± 4 | − 24.8 ± 13.2 | − 2.4 ± 4 | 2.2 ± 4.8 | 1.3 ± 4.4 |
Group systematic error (M) | − 0.8 | − 0.2 | 0.2 | − 0.8 | − 0.6 | − 1.9 |
Group systematic error SD (Σ) | 2.8 | 3.3 | 11.7* | 2.5* | 4.4 | 5.7 |
Root mean square of SD’s (σ) | 3.1 | 3.1 | 7.8* | 2.8* | 3.4 | 3.1 |
Required margins (mm) | 9 | 10 | 35 | 8 | 13 | 16 |
