Visualization of the 3D laminar architecture in FLASH, comparison between ST and DTI putative sheetlet-normal and myocyte orientation vectors and angles. A – FLASH volume cropped to remove the heart base and the anterior ventricles. The sheetlets are colored red, and the sheetlet-interstices are white. The complex pattern of the laminae is seen, but the myocyte orientation cannot be directly observed. B - angle between the DTI (6-direction) and ST putative sheetlet-normal vectors and putative myocyte-orientation vectors, which are colored according to the 0° to +90° scale shown. C – the ST and DTI putative sheetlet-normal elevation (β’), sheetlet-normal transverse (β”), putative myocyte helix angle (α’), and putative myocyte transverse angle (α”), angle maps, which are colored according to the −90° to +90° scale shown. DTI: Scan #1, 6-direction, b = 1000 s/mm2; ST: Scan #8, DTW = 3, STW = 3. FLASH: fast low angle shot; ST: structure tensor of FLASH data; DTI: diffusion tensor magnetic resonance imaging; DTW: derivative template width STW: smoothing template width. The symbols for vectors and derived angles are defined in Table 2.