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. 2019 Sep 11;9:13095. doi: 10.1038/s41598-019-49311-w

Table 4.

DTI acquisition parameters on four different MRI systems.

1.5 T Philips 3 T Philips 3 T Siemens 3 T GE
Head coil 8 channel 8 channel 12 channel 32 channel
b-values [s/mm2] 0, 1000 0, 1000 0, 1000 0, 1000
No. of gradient directions36 30 30 30 30
TR [ms] 6218 8600 9700 15290
TE [ms] 100 97 93 79
FoV [mm2] 256 × 256 256 × 256 244 × 244 240 × 240
Acquisition matrix

128 × 128

(reconstructed to 256 × 256)

128 × 128

(reconstructed to 256 × 256)

122 × 122

(reconstructed to 256 × 256)

120 × 120

(reconstructed to 256 × 256)

Slice thickness [mm] 2 2 2 2
Voxel size [mm3] (1 × 1 × 2) (1 × 1 × 2) (0.95 × 0.95 × 2) (0.94 × 0.94 × 2)
No. of slices 42 40 48 52
Parallel imaging method SENSE SENSE GRAPPA ASSET
Pixel bandwidth [Hz/pixel] 1787 1742 1414 1953
Acquisition time 4 min 48 sec 5 min 12 sec 5 min 30 sec 6 min 18 sec
Total scan time 1 hour 12 min 1 hour 18 min 1 hour 22 min 30 sec 1 hour 37 min 30 sec

The b = 0 images were acquired five times and averaged to enhance the SNR. In the output DTI image, there is only one b = 0 volume which is already an average of 5 acquisitions.