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1 Department of Mechanical Engineering and 2 Department of Biomedical Engineering, Eindhoven University of Technology, 5600 MB Eindhoven; 3 Department of Experimental In Vivo NMR, Utrecht University, 3508 TC Utrecht; and 4 Department of Biophysics, Maastricht Univesity, Maastricht, 6200 MD The Netherlands
Cardiac myofiber orientation is a
crucial determinant of the distribution of myocardial wall stress.
Myofiber orientation is commonly quantified by helix and transverse
angles. Accuracy of reported helix angles is limited. Reported
transverse angle data are incomplete. We measured cardiac myofiber
orientation postmortem in five healthy goat hearts using magnetic
resonance-diffusion tensor imaging. A novel local wall-bound coordinate
system was derived from the characteristics of the fiber field. The
transmural course of the helix angle corresponded to data reported in
literature. The mean midwall transverse angle ranged from 
12 ± 4° near the apex to +9.0 ± 4° near the base of the left
ventricle, which is in agreement with the course predicted by Rijcken
et al. (18) using a uniform load hypothesis. The
divergence of the myofiber field was computed, which is a measure for
the extent to which wall stress is transmitted through the myofiber
alone. It appeared to be <0.07 mm
1 throughout the
myocardial walls except for the fusion sites between the left and right
ventricles and the insertion sites of the papillary muscles.
cardiac myofiber orientation; cardiac coordinate system
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