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Background Cardiovascular magnetic resonance (CMR) diffusion tensor imaging (CDTI) shows potential to interrogate myocardial microstructure and its dynamics in health and disease. It has been suggested that anisotropies of diffusion measured in vivo might be accounted for and need correction by myocardial strains measured macroscopically. However, relations between nano-, microand macro-scale deformations are complex in myocardium. Appreciation of the nature and functional role of myocardial laminar microstructures (sheetlets and shear layers) seems sparse and we have been unable to find appropriate visualisation of them in human hearts. We aimed to visualise the microstructures which could logically account for anisotropies of the ~50μm mean distances of diffusion per cycle recorded by CDTI in humans, and to conceptualise the likely effects on equeous diffusion of their cyclic re-orientations and deformations.

journal of cardiovascular magnetic resonance

Histology of human myocardial laminar microstructure and consideration of its cyclic deformations with respect to interpretation of in vivo cardiac diffusion tensor imaging