Comparison of free breathing and respiratory triggered diffusion-weighted imaging sequences for liver imaging

Table 1 Imaging parameters used for the study on a 1.5-T magnetic resonance imaging scanner

Sequence	TE (ms)	TR (ms)	Slice Thickness/0-mm gap (mm)	Time	Matrix size
T1-gradient dual echo	2.1 and 4.2	170	5	2 s × 19 s BH	320 × 219
T2 fast-spin echo	93	5331	5	5 min	256 × 135
Dynamic pre-Gd and post-Gd VIBE	2.65	2.65	3	16 s BH	288 × 192
FB-DWI	67	7900	5	4 min 44 s	128 × 104
SMS-DWI	56	5000	5	3 min 4 s	128 × 104
PACE-DWI	56	2600	5	5 min 58 s	128 × 104

VIBE: Volumetric interpolated breath-hold examination; FB-DWI: Free-breathing diffusion-weighted imaging; SMS-DWI: Simultaneous multislice diffusion-weighted imaging; PACE-DWI: Prospective acquisition correction diffusion-weighted imaging; BH: Breath hold; TE: Echo time; TR: Repetition time.