Fig. 9.

a Pilot SRI data in the LV myocardium reconstructed at 1.1 μm isotropic resolution shows improved definition of cells, sheetlets, arterioles, venules and capillaries. Scale bar is 500 μm. b Magnified SRI image. c Normalised maximum-intensity-projection (MIP) of SRI data through a 100 μm slice, corresponding to a single-voxel thickness in the DTI data, shows bright vascular structures. d Normalised MIP of SRI data with vascular component set to 0. e Helix angle (HA), transverse angle (TA), sheet elevation (SE) and sheet azimuth (SA) based on DTI, STSRI and STSRI data with vessels excluded. Here, the ST kernel size = 7³ voxels, centre frequency = $\frac{2\pi }{3}$, and SE and SA were calculated based on v _3,DT and v _1,ST. Excluding vessels from the ST reconstruction results in modest reduction in heterogeneity due to vessel contribution (see arrows)