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Fig. 5 —Case example 2: 60-year-old man with atypical chest pain underwent electron beam tomography (EBT) coronary calcium scanning and exercise myocardial perfusion SPECT. Coronary calcium score was 20 in left circumflex and right coronary arteries. No calcifications could be seen in left anterior descending (LAD) artery. Exercise myocardial perfusion SPECT showed large reversible defect indicating presence of hemodynamically significant LAD lesion. In image a (CT original), arrow shows hypodense area in LAD artery proximal to second diagonal branch, which may be lipid-rich plaque. In image b, Plaquant identified lipid-rich lesions (red) at this location. Lipid threshold for this scan was -5 H. Coronary angiography (ANGIO) (image c) performed within 1 month of images a and b revealed 80% stenosis of LAD artery (arrow) proximal to second diagonal branch. This patient underwent stenting. QUANT = Plaquant.