Table 4.

Expected acquisition times of conventional versus fast brain MRI sequences.

Conventional 2D sequences	acquisition time (min)	Fast 2D sequences	acquisition time (min)	Time reduction (min)
DWI (R=2)	3.0	SMS DWI (R=2, MB=2)	1.1	1.9
TSE T1	2.8	T1 FLASH	0.7	2.1
TSE FLAIR (R=2)	3.6	TSE FLAIR (R=3)	1.8	1.8
TSE T2	0.67	No accelerated counterpart	n/a	0
Sagittal T1	1.7	No accelerated counterpart	n/a	0
Conventional 3D sequences	acquisition time (min)	Fast 3D sequences	acquisition time (min)	Time reduction (min)
SWI (R=2)	5.1	Wave-CAIPI SWI (R=4)	2.2	2.9
SPACE T2 (R=6)	4.2	Wave-CAIPI SPACE T2 (R=9)	3	1.2
SPACE FLAIR (R=2)	6.4	Wave-CAIPI SPACE FLAIR (R=4)	3.6	2.8
MPRAGE (R=2)	5.6	Wave-CAIPI MPRAGE (R=4)	2.4	3.2

R=acceleration factor, MB=multiband acceleration factor, TSE-turbo spin-echo, FLASH=Fast Low Angle SHot, SWI=susceptibility-weighted imaging, DWI=diffusion-weighted imaging, FLAIR=Fluid Attenuated Inversion Recovery, SPACE= Sampling Perfection with Application optimized Contrasts using different flip angle Evolution, MPRAGE=Magnetization Prepared Rapid Gradient-Echo, CAIPI=Controlled Aliasing in Parallel Imaging, SMS=simultaneous multi-slice.