Abstract
To assess the image quality of contrast-enhanced magnetic resonance angiography (CE-MRA) of the carotid artery with open 0.35-T magnetic resonance imaging (MRI), compared to a 1.5-T high-field system. 100 patients were retrospectively evaluated with CE-MRA for suspected carotid or vertebral artery disease. 50 patients were investigated using an open-design 0.35-T MRI system, 50 were examined on a 1.5-T closed-bore magnet system. Maximum intensity (MIP) and volume-rendering technique (VRT) reconstructions were performed. Image quality was assessed using a four-point ranking score (1 = excellent, 4 = not evaluable). Signal-to-noise (S/N) ratio was measured. The data were analyzed using Wilcoxon's test (score data) and Student's t-test (S/N ratio). Significance levels were set at p 0.05). The 1.5-T system showed significantly or highly significantly better image quality scores, compared to the 0.35-T system. Nevertheless, image quality was rated satisfactory also using 0.35 T field strength.
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