A new imaging method for assessment of aortic dissection using four-dimensional phase contrast magnetic resonance imaging

摘要: Introduction Medical management of type B aortic dissection can result in progressive dilation the false lumen and poor long-term outcome. Recent studies using models have suggested flow characteristics, such as stroke volume, velocity, helicity, are related to expansion. The aim this study was assess whether four-dimensional phase-contrast magnetic resonance imaging (4D PC-MRI) accurately visualize quantify characteristics patients with these features rate Methods Twelve consecutive medically treated thoracic underwent a three-dimensional (3D) MRI anatomy scan blood pool contrast agent. Two-dimensional phase data (2D were acquired ascending descending aorta 4D PC-MRI entire aorta. 2D measurements used quality velocity data. Stroke direction calculated expansion measured on contrast-enhanced computed tomography. Results Comparison showed good correlation (Pearson R 2 = 0.98; 95% confidence interval [CI], 0.9818-0.9953; P ρ 0.62; CI, 0.06-0.89; .0347). False thrombosis (FLT) seen 7 12 not associated reduced (FLT present: 11.4 mm/y; IQR, 3.6-21.4) vs FLT absent: 9.9 3.4-24.2; Mann-Whitney .8763). volume more rapid ( 0.80 [95% 0.39-0.94; .0029] 0.59 0.09-0.87; .0480] respectively). position dominant entry tear expansion, which tended be higher distal proximal tears (distal, 21.4 mm/y [IQR, 11.4-48.9] proximal, 5.5 3.4-16.6]; .096). Helical 8 0.83, .0154). Conclusions applied dissection. tears, helical This demonstrates potential new method. A larger prospective is now required measure determine their predictive value for risk stratification