A–C, An example of MR images and histopathologic features of carotid plaque with mixed components. A–C, An example of MR images and histopathologic features.

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A–C, An example of MR images and histopathologic features of carotid plaque with mixed components. A–C, An example of MR images and histopathologic features of carotid plaque with mixed components. A and B, Short-axis T1- and T2-weighted images. Inset, a magnification of the atherosclerotic carotid plaque. With manual operator-defined ROIs for calcification (a) and fibrosis (b) as major components, the rSIs of calcification and fibrosis on T1-weighted images were 0.61 and 1.05, respectively. In the same way, the rSIs of calcification and fibrosis on T2-weighted image was 0.3 and 1.3, respectively. Asterisks indicate the lumen. C, Masson trichrome stained cross section matched to axial MR images (A,B) demonstrate so-called hard plaque composed of abundant collagen fibers (b) and calcification (a). Small intraplaque hemorrhage was also confirmed in this section. K. Yoshida et al. AJNR Am J Neuroradiol 2008;29:868-874 ©2008 by American Society of Neuroradiology