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.