Table 2.
Group mean (M), systematic error (Σ), random error (σ) and % with an absolute mean distance ≥ 4.0 mm (17 patients, 71 fractions). The last 3 columns concern breast volumes (Vbreast) <800 cc (n = 8, 31 fractions) and > 800 cc (n = 9, 40 fractions) and the corresponding p value.
| ROI | M(mm) | Σ (mm) | σ (mm) | ROI |mean distance| ≥4.0 mm |
p |
||
|---|---|---|---|---|---|---|---|
| All fractions | Vbreast <800 cc | Vbreast >800 cc | |||||
| UL | 0.8 | 1.6 | 1.6 | 8/71 (11%) | 4/31 (13%) | 4/40 (10%) | NS |
| UM | 0.2 | 2.0 | 1.3 | 7/71 (10%) | 0/31 (0%) | 7/40 (18%) | 0.016 |
| LM | −1.4 | 2.1 | 1.1 | 9/71 (13%) | 1/31 (3%) | 8/40 (20%) | 0.07 |
| LL | −0.8 | 1.9 | 1.4 | 7/71 (10%) | 0/31 (0%) | 7/40 (18%) | 0.016 |
| WB | −0.3 | 1.5 | 1.0 | 2/71 (3%) | 0/31 (0%) | 2/40 (5%) | NS |
| Axilla | 0.6 | 3.0 | 2.9 | 17/71 (24%) | 5/31 (16%) | 12/40 (30%) | NS |
Abbreviations: ROI = region of interest, UL = upper lateral, UM = upper medial, LM = lower medial, LL = lower lateral, WB = whole breast, V = volume. NS = not significant (i.e., p value > 0.1).