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Figure 2 Depiction of the magnetic resonance imaging (MRI) catheter with imaging areas superimposed on a cross section of a human coronary artery (left). Interrogation of the arterial wall is in four quadrants, each comprising a field of view. A single field of view is denoted by the white arrowhead. The MRI diagram (right) displays the lipid fraction in each quadrant assessed by the catheter. In this particular illustration, an increased lipid concentration is noted only in quadrant 3, as it displays yellow. Quadrants 1, 2, and 4 are shown in blue, indicating a low lipid content or increased fibrous content.