Signal characteristic alterations of carotid artery dissection on high resolution magnetic resonance imaging: a follow-up study
چکیده
Methods Five patients (4 male, age range 33-55 years) with proven spontaneous CAD were scanned at baseline (within 2 weeks of symptom initiation) and at follow-up using high resolution MRI. Axial two dimensional ECG gated double inversion recovery T1 weighted (T1W) turbo spin echo images were acquired before and after administration of 0.1 mmol/kg gadolinium (acquired resolution: 0.35x0.35x2mm). Degree of stenosis, presence intraluminal thrombosis, intramural hematoma (IMH) and perivascular enhancement (PVE) were evaluated on both scans. On matched images, regions of interest (ROI) were selected for each of the above mentioned components if present. Contrast enhancement of each component was calculated as percent difference of signal to noise ratios (i.e. signal intensity of the selected ROI divided by standard deviation of noise) on pre and post contrast T1W images.