Table 4 Comparison of typical dissection signs detected by MRA and HRMR-VWI
The typical sign detection of artery dissection | MRA | HRMR-VWI | Χ2 value | p value |
|---|---|---|---|---|
Early stage(acute and subacute stage) | ||||
 Tapered stenosis or occlusion or IMH | 9(56.3) | 12(75.0) | 1.247 | 0.264 |
 Intimal flap or double lumen | 3(18.8) | 10(62.5) | 6.348 | 0.012 |
 Aneurysmal dilatation or protrusion | 7(43.8) | 8(50.0) | 0.125 | 0.723 |
Chronic stage | ||||
 Tapered stenosis or occlusion or IMH | 2(9.1) | 2(9.1) | / | 1.000 |
 Intimal flap or double lumen | 10(45.5) | 11(50.0) | 0.000 | 1.000 |
 Aneurysmal dilatation or protrusion | 12(54.5) | 13(59.1) | 0.093 | 0.761 |
At all stages | ||||
 Tapered stenosis or occlusion or IMH | 10(26.3) | 13(34.2) | 0.561 | 0.454 |
 Intimal flap or double lumen | 12(31.6) | 21(55.3) | 4.338 | 0.037 |
 Aneurysmal dilatation or protrusion | 19(50.0) | 21(55.3) | 0.211 | 0.646 |