Fig. 6.

Manual and automated classification of lipid and calcification using multicontrast MR images obtained in repeated scans. Manual contours overlaid on the T1w image (a, h). Lipid = yellow, calcification = orange, lumen = red, outer wall = green. Using SCM muscle as reference, lipid (yellow arrow) appears hyperintense on T1w and PDw images. As can be seen, the classifier consistently identifies lipid (yellow region) in two scanning sessions (g, n), while the observer does not (f, m). Both segmentation methods could identify calcification (orange region) in the first scan (f, g), but no calcification was found at the same location in the second scan (m, n) because the observer annotated the region of juxta-luminal calcification (orange arrow) as lumen