Table 4 The median \(\delta _{V}\) values are listed in % for each volunteer and slice position using no correction, the normalization factor and the large ROIs 6 (best) and 4 (worst) for the ROI-based normalization
From: Ventilation and perfusion MRI at a 0.35 T MR-Linac: feasibility and reproducibility study
| Â | Median \(\varvec{\delta }_{V}\) over scans in % | |||||||
|---|---|---|---|---|---|---|---|---|
Volunteers | Uncorrected | Normalization factor | Best large ROI | Worst large ROI | ||||
Aorta | Lung | Aorta | Lung | Aorta | Lung | Aorta | Lung | |
Vol 1 | 12.8 | 34.9 | 16.5 | 21.7 | 9.3 | 16.4 | 16.1 | 34.0 |
Vol 2 | 16.8 | 23.1 | 11.6 | 3.7 | 10.3 | 9.3 | 29.6 | 11.7 |
Vol 3 | 45.5 | 37.8 | 16.7 | 7.4 | 5.7 | 4.4 | 7.5 | 3.4 |
Vol 4 | 17.0 | 6.2 | 3.2 | 14.1 | 13.2 | 3.9 | 12.9 | 7.9 |
Vol 5 | 23.6 | 44.2 | 9.7 | 4.6 | 5.0 | 4.4 | 5.1 | 12.2 |
Vol 6 | 36.5 | 52.7 | 13.3 | 11.4 | 3.3 | 2.8 | 6.7 | 8.6 |
Vol 7 | 26.9 | 17.9 | 1.5 | 4.0 | 1.8 | 3.7 | 22.0 | 12.4 |
Vol 8 | 38.2 | 50.0 | 8.1 | 7.1 | 6.0 | 13.4 | 2.8 | 5.6 |
Vol 9 | 22.7 | 18.1 | 12.0 | 11.5 | 2.3 | 22.0 | 10.6 | 11.6 |
Vol 10 | 25.7 | 29.5 | 7.6 | 13.6 | 6.5 | 8.4 | 5.0 | 13.6 |
Median | 24.9 | 35.6 | 9.1 | 9.5 | 5.7 | 6.8 | 7.5 | 9.8 |
All Scans Median | 29.5 | 9.1 | 5.7 | 8.6 | ||||