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MR Angiography Index (MRAI) Calculator
MR Angiography Index (MRAI): Explanation and Clinical Context MR Angiography Index (MRAI) is a semi-quantitative scoring system used to assess the severity and burden of arterial stenosis based on magnetic resonance angiography (MRA). Each arterial segment is scored from 0 (no stenosis) to 4 (total occlusion), and the total MRAI reflects the overall extent of vascular disease. Higher MRAI values indicate more extensi