What are the CT and MRI imaging features of some common coronary arterial pathologies?
Coronary CT is the reference standard for evaluation of coronary calcification in vivo. Coronary calcification is defined by a lesion with attenuation greater than 130 Hounsfield units. The calcium score can be obtained either by conventional Agatston score or a volumetric score, with the Agatston being the most common methodology. The score is obtained by multiplying a factor related to the peak Hounsfield unit value in the plaque by the area of the plaque and summing the calcification score from all of the plaques in each of the vessels—namely left main artery, LAD artery, circumflex artery, and RCA.
A coronary arteriovenous fistula (AVF) is visualized as an abnormal communication between the coronary artery and coronary venous system, typically showing dilation of tortuous vessels with drainage most commonly to the coronary sinus. This can be identified either by coronary CTA or MRA