Figure 7From: Comparison of diffusion tensor imaging by cardiovascular magnetic resonance and gadolinium enhanced 3D image intensity approaches to investigation of structural anisotropy in explanted rat hearts ST and DTI putative sheetlet normal orientations compared voxel-wise to the FI normal (|∠[v 3 ST /e 3 DTI ]n FI |). These frequency distributions summarize the orientations from the interactively segmented sheetlets of Figure 3 for the lateral ROI (left) and for the septal ROI (right). A - distributions produced for the first set of imaging/image-processing parameters compared to FI (DTI: Scan #1, 6-direction, b = 1000 s/mm2; ST: Scan #8, DTW = 3, STW = 3). B - distributions for the second set of imaging/image-processing parameters compared to FI (DTI: Scan #2, 12-direction, b = 1000 s/mm2; ST: Scan #8, DTW = 5, STW = 5) allow assessment of sensitivity of the measured laminar normals to these parameters. Note: the deviation angles shown in these histograms are not on a circular scale as they are absolute values and 0° ≠ 90°. FLASH: fast low angle shot; ST: structure tensor of FLASH data; DTI: diffusion tensor magnetic resonance imaging; FI: FLASH isosurface data; DTW: derivative template width STW: smoothing template width. The symbols for vectors and derived angles are defined in Table 2.Back to article page