Impact of fixation, coil, and number of excitations on diffusion tensor imaging of rat brains at 7.0 T

Wang, Chunhua; Song, Li; Zhang, Ruzhi; Gao, Fabao

doi:10.1186/s41747-018-0057-2

European Radiology Experimental

Table 4 Comparisons of DTI parameters and SNR using different coils and different numbers of excitations

From: Impact of fixation, coil, and number of excitations on diffusion tensor imaging of rat brains at 7.0 T

Structures	Comparisons	Fractional anisotropy	Mean diffusivity	Axial diffusivity	Radial diffusivity	R1 (λ2/λ1)	R2 (λ3/λ1)	R3 (λ2/λ3)	SNR
Corpus callosum	SC-1 versus VC-1	0.016	0.067 (ns)	0.016	0.354 (ns)	0.109 (ns)	0.003	0.024	0.020
	SC-1 versus SC-4	0.003	0.001	0.001	0.001	0.255 (ns)	0.002	0.004	0.001
	VC-1 versus VC-4	0.259 (ns)	0.010	0.010	0.042	0.536 (ns)	0.017	0.088 (ns)	< 0.001
	VC-4 versus SC-4	0.191 (ns)	< 0.001	< 0.001	< 0.001	0.462 (ns)	0.111 (ns)	1.000 (ns)	0.034
External capsule	SC-1 versus VC-1	< 0.001	0.050 (ns)	0.007	0.262 (ns)	< 0.001	< 0.001	0.004	0.004
	SC-1 versus SC-4	0.001	< 0.001	0.001	< 0.001	0.001	0.002	0.010	0.001
	VC-1 versus VC-4	0.151 (ns)	0.008	0.017	0.008	0.129 (ns)	0.235 (ns)	0.507 (ns)	< 0.001
	VC-4 versus SC-4	0.048	0.001	0.001	0.002	0.004	0.048	0.503 (ns)	0.007
Anterior commissure	SC-1 versus VC-1	0.009	0.365 (ns)	0.742 (ns)	0.194 (ns)	0.724 (ns)	0.008	0.064 (ns)	0.001
	SC-1 versus SC-4	0.009	< 0.001	< 0.001	< 0.001	0.784 (ns)	0.004	0.047	0.004
	VC-1 versus VC-4	0.328 (ns)	0.115 (ns)	0.022	0.361 (ns)	0.118 (ns)	0.524 (ns)	0.222 (ns)	< 0.001
	VC-4 versus SC-4	0.882 (ns)	0.018	0.046	0.066 (ns)	0.444 (ns)	0.445 (ns)	0.080 (ns)	0.001
Internal capsule and cerebral peduncle	SC-1 versus VC-1	0.030	0.507 (ns)	0.538 (ns)	0.510 (ns)	0.011	0.001	0.001	< 0.001
	SC-1 versus SC-4	0.566 (ns)	0.003	0.002	0.023	0.005	0.026	0.001	0.001
	VC-1 versus VC-4	0.048	0.009	0.047	0.021	0.601 (ns)	0.013	0.020	< 0.001
	VC-4 versus SC-4	0.002	0.059 (ns)	0.013	0.779 (ns)	0.391 (ns)	0.001	0.010	< 0.001
Optic tract	SC-1 versus VC-1	0.343 (ns)	0.851 (ns)	0.328 (ns)	0.815 (ns)	0.928 (ns)	0.203 (ns)	0.159 (ns)	< 0.001
	SC-1 versus SC-4	0.238 (ns)	0.015	0.001	0.068 (ns)	0.812 (ns)	0.126 (ns)	0.028	0.002
	VC-1 versus VC-4	0.545 (ns)	0.073 (ns)	0.026	0.151 (ns)	0.823 (ns)	0.413 (ns)	0.228 (ns)	< 0.001
	VC-4 versus SC-4	0.150 (ns)	0.090 (ns)	0.032	0.578 (ns)	0.688 (ns)	0.028	0.021	< 0.001
Cortex	SC-1 versus VC-1	0.011	0.055 (ns)	0.028	0.242 (ns)	0.122 (ns)	0.011	0.005	0.012
	SC-1 versus SC-4	0.001	0.001	0.007	< 0.001	0.004	0.001	0.003	0.001
	VC-1 versus VC-4	0.001	0.012	0.042	0.055 (ns)	0.771 (ns)	0.534 (ns)	0.829 (ns)	< 0.001
	VC-4 versus SC-4	0.060 (ns)	0.001	0.001	0.002	0.363 (ns)	0.256 (ns)	0.504 (ns)	0.008
Hippocampus	SC-1 versus VC-1	0.024	0.054 (ns)	0.020	0.103 (ns)	0.129 (ns)	0.021	0.001	0.008
	SC-1 versus SC-4	0.001	< 0.001	0.001	0.721 (ns)	0.006	0.002	0.002	0.001
	VC-1 versus VC-4	0.011	0.007	0.008	0.007	0.287 (ns)	0.065 ns)	0.002	< 0.001
	VC-4 versus SC-4	0.328 (ns)	0.005	0.003	0.814 (ns)	0.691 (ns)	0.363 (ns)	0.272 (ns)	0.013
Striatum	SC-1 versus VC-1	0.008	0.107 (ns)	0.004	0.948 (ns)	0.011	0.006	0.008	0.002
	SC-1 versus SC-4	0.003	< 0.001	0.001	< 0.001	0.006	0.002	0.004	0.002
	VC-1 versus VC-4	0.091 (ns)	0.008	0.014	0.007	0.259 (ns)	0.048	0.001	< 0.001
	VC-4 versus SC-4	0.005	0.006	0.004	0.010	0.007	0.009	0.011	0.003

Data are p values
SNR signal-to-noise ratio, SC-1 surface coil and one excitation, SC-4 surface coil and four excitations, VC-1 volume coil and one excitation, VC-4 volume coil and four excitations

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