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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
  1. Data are p values
  2. 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