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Figure 5 Assessment of cardiac muscle fiber orientation by diffusion tensor magnetic resonance imaging. In these examples (A and B), scalar and tensor glyph visualization methods have been used to investigate the helical structure of the heart muscle in an explanted fixed canine heart. Right-handed helical orientation (subendocardium) is shown in shades of purple, and left-handed helical muscle fiber orientation (subepicardium) is shown in shades of blue. The cross-sectional view (B) has been viewed from the basal end of the left ventricle. Reproduced from Zhukov and Barr (46) with permission. LV = left ventricle; RV = right ventricle.