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Fig. 2 —Figure shows regions of interest (ROIs) drawn and image histogram
for a healthy 55-year-old man from low-risk group. Normal blood pool (BP) ROI
and histogram are shown in blue; ROI and histogram for left main (LM) artery
are shown in green. Fitted gaussian curve is shown in black. LM artery
histogram does not intersect fitted gaussian curve; therefore, no lipid
threshold or lipid-rich lesions are found.
