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Fig. 1B —58-year-old man who presented to emergency department with acute chest pain. Righted-sided pulmonary arterial circulation (A) and left-sided pulmonary arterial circulation (B) coronary CT scans show mean contrast enhancement (HU) of pulmonary arterial segments. Mean vessel opacification decreases in craniocaudal direction as contrast agent passes from pulmonary to systemic circulation during dedicated cardiac MDCT acquisition. apic = apical; seg = segment; ant = anterior; post = posterior; rul = right upper lobe; rpa = right pulmonary artery; rll = right lower lobe; rml = right middle lobe; sup = superior; med = medial; lat = lateral; lul = left upper lobe; lpa = left pulmonary artery; lll = left lower lobe; ling = lingula; inf = inferior.