FLASH image data. A – the location of the lateral ROI is shown. B – visualization of the laminar architecture of a selected ROI in the lateral left ventricle wall. Myolaminae are colored in pink and sheetlet interstices in yellow. A cuboid divided into slices shows the region which will be explored in detail. C – the cuboid from (B) is shown (i) in isolation, (ii) with weighted shading to divide the image into laminae and sheetlet interstices, which are further separated by contour lines (iii) the tissue is rendered transparent, so that the structure of sheetlet interstices segmented within the ROI volume can be seen. D – the ROI from (C) is split (exploded) into slices to show the structure of the sheetlet interstices. E – the structure of the sheetlet interstices are shown in the same orientation as in the other images (i), and in (ii) & (iii) rotated to reveal the branching structure of the sheetlet interstices. Image data from FLASH scan #8. L: left; R: right; endo: endocardium; epi: epicardium; ROI: region of interest; FLASH: fast low angle shot. The symbols for vectors and derived angles are defined in Table 2.