Figure 2:

Cardiac MR imaging region of interest measurements obtained, A, before and, B, after gadolinium chelate administration and reformatted cardiac CT region of interest measurements obtained, C, before and, D, after administration of an iodinated contrast agent. For cardiac CT, the anterolateral myocardium was most reliably identified before administration of an iodinated contrast agent. There, a region of interest from the anterolateral myocardium was used for attenuation measurements. A focal myocardial scar was identified on delayed cardiac MR images and was not included in the region of interest. Orange outline = myocardium, white circle = blood pool.