Table 1.
Flow Results for Thresholding Methods
| Artery | Local threshold (20%) | Global threshold (10%) | 2D PCMRI | |||||
|---|---|---|---|---|---|---|---|---|
| Flow diff ± SD | P | ICC | Flow diff ± SD | P | ICC | N | Flow ± SD | |
| ICAR | 5.3 ± 22.5 | 0.17 | 0.88 | –11.4 ± 23.6 | 0.007 | 0.86 | 35 | 212.5 ± 43.9 |
| ICAL | 0.2 ± 19.4 | 0.96 | 0.90 | –15.3 ± 22.0 | <0.001 | 0.84 | 35 | 198.2 ± 39.9 |
| BA | 3.0 ± 11.0 | 0.12 | 0.93 | 6.6 ± 13.3 | 0.006 | 0.90 | 34 | 108.7 ± 30.4 |
| MCAR | –1.3 ± 13.0 | 0.54 | 0.88 | –2.1 ± 14.0 | 0.39 | 0.87 | 35 | 126.6 ± 25.8 |
| MCAL | 7.0 ± 14.1 | 0.006 | 0.84 | 6.3 ± 14.6 | 0.016 | 0.85 | 35 | 127.3 ± 29.6 |
| ACAR | 0.0 ± 10.3 | 0.99 | 0.91 | 2.7 ± 9.5 | 0.10 | 0.93 | 34 | 78.3 ± 24.3 |
| ACAL | –5.3 ± 13.8 | 0.03 | 0.76 | –1.5 ± 15.0 | 0.57 | 0.76 | 33 | 72.4 ± 18.1 |
| PCAR | –7.3 ± 9.1 | <0.001 | 0.41 | 6.7 ± 9.1 | <0.001 | 0.52 | 35 | 46.3 ± 8.9 |
| PCAL | –1.7 ± 11.9 | 0.41 | 0.58 | 9.1 ± 10.2 | <0.001 | 0.47 | 34 | 49.7 ± 9.8 |
Flow rate difference (Flow diff) [ml/min], standard deviation (SD) [ml/min] and ICC between 2D PCMRI and 4D flow MRI for each artery presented separately for two methods; local thresholding (20%) and global thresholding (10%). Mean flow for each artery is presented as 2D PCMRI flow [ml/min].
ICA, internal carotid artery; BA, basilar artery; MCA, middle cerebral artery; ACA, anterior cerebral artery; PCA, posterior cerebral artery; R, right; L, left.