Multiparametric FDG-PET/MRI of Hepatocellular Carcinoma: Initial Experience

Table 1

MRI acquisition parameters.

	IVIM	BOLD	DCE-MRI
Sequence type	2D SS-EPI	2D MGRE	3D FLASH
Acquisition plane	Axial	Axial	Axial
TE (ms)	75	1.1, 2.4, 3.8, 5.2, 6.6, 8.0, 10.0, 12.0, 15.0, 20.0, 25.0, 30.0	1
TR (ms)	One respiration	249	2.9
FA (°)	90	18	11
b values (s/mm^2)	0, 15, 30, 45, 60, 75, 90, 105, 120, 135, 150, 175, 200, 400, 600, 800	—	—
Number of averages	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 3, 4	1	1
FOV (mm^2)	360 × 270	360 × 270	360 × 270
Matrix	128 × 96	512 × 384	384 × 288
Slice thickness (mm)	7	7	4.5
Number of slices	20	5	44
Acceleration factor	2	2	4
Acquisition time (min:s)	08:00	0:15	0:04 per dynamic

BOLD,  blood oxygenation level-dependent; DCE-MRI,  dynamic contrast-enhanced MRI; EPI,  echo planar imaging; FA,  flip angle; FLASH,  fast low-angle shot; FOV,  field-of-view; IVIM,  intravoxel incoherent motion; MGRE,  multigradient recalled echo; TE,  echo time; TR,  repetition time. IVIM acquisition was respiratory triggered using a navigator echo.