Table 4 DTI acquisition parameters on four different MRI systems.

From: Reduction of bias in the evaluation of fractional anisotropy and mean diffusivity in magnetic resonance diffusion tensor imaging using region-of-interest methodology

 

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

  1. †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.
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