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

Table 4 Summary statistics of voxel-wise comparison of ST/DTI sheetlet normal to FI

# ^a	STW/DTW	CMR	n-dir	b-value (s/mm ² )	\|∠[v ₃ ^ST or e ₃ ^DTI ]n ^FI \| median ± I.Q.R. (°)
LATERAL ROI
First ST and DTI parameter sets
8	3/3	T1W	NA	NA	8.7 ± 7.8
1	NA	DTI	6	1000	22.5 ± 13.8
Second ST and DTI parameter sets
8	5/5	T1W	NA	NA	9.1 ± 7.4
2	NA	DTI	12	1000	24.1 ± 11.9
SEPTAL ROI
First ST and DTI parameter sets
8	3/3	T1W	NA	NA	7.4 ± 8.7
1	NA	DTI	6	1000	54.4 ± 47.3
Second ST and DTI parameter sets
8	5/5	T1W	NA	NA	8.5 ± 9.7
2	NA	DTI	12	1000	60.5 ± 53.4

These statistics relate to the histograms in Figure 7 of the voxel-wise comparison of ST and DTI determined sheetlet putative normal orientations to the FI normal for the lateral ROI (left) and for the septal ROI (right). ; ^a – scan # as defined in Table 1; NA: Not Applicable; FLASH: fast low angle shot; ST: structure tensor of FLASH data; DTI: diffusion tensor magnetic resonance imaging; T1W is T1-weighted FLASH; n-dir: number of diffusion directions; ROI: region(s) of interest. FI: FLASH isosurface data; DTW: derivative template width STW: smoothing template width. The symbols for vectors and derived angles are defined in Table 2.

ISSN: 1532-429X