Table 1.

Parameters used in two MRI scanners.

MRI sequence	Parameter	1.5-T scanner	3.0-T scanner
Axial T2-weighted spin-echo FLAIR	Slice thickness	5.0 mm	4.0 mm
	Pixel/voxel size	0.9 X 0.9 mm	1.1 X 1.1 mm
	Echo time	140 ms	135 ms
	Repetition time	11,000 ms	8,000 ms
	Inversion time	2,200 ms	2,400 ms
	Acquisition matrix	256 X 256	512 X 512
Axial T1-weighted spin-echo	Slice thickness	5.0 mm	4.5 mm
	Pixel/voxel size	0.8 X 0.8 mm	0.9 X 0.9 mm
	Echo time	15 ms	13 ms
	Repetition time	616 ms	660 ms
	Acquisition matrix	256 X 256	512 X 512
Axial T2-weighted spin-echo	Slice thickness	5.0 mm	4.0 mm
	Pixel/voxel size	0.5 X 0.5 mm	0.6 X 0.6 mm
	Echo time	100 ms	92 ms
	Repetition time	5,655ms	3,000 ms
	Acquisition matrix	256 X 256	576 X 576
Axial contrast-enhanced three-dimensional T1-weighted gradient-echo	Slice thickness	2.0 mm	1.0 mm
	Pixel/voxel size	0.7 X 0.7 mm	1.0 X 1.0 mm
	Echo time	3.79 ms	3.5 ms
	Repetition time	25 ms	7.9 ms
	Acquisition matrix	352 X 352	512 X 512
Axial echo-planar DWI with ADC mapping	Slice thickness	3.5 mm	3.5 mm
	Pixel/voxel size	0.7 X 0.7 mm	1.79 X 1.79 mm
	Echo time	77.6 ms	117 ms
	Repetition time	6,629 ms	5,852 ms
	Acquisition matrix	336 X 336	432 X 432

FLAIR, fluid-attenuated inversion recovery; DWI, diffusion-weighted imaging; ADC, apparent diffusion coefficient.