Table 1.

Scan paremeters for 3 kinds of MR cisternography.

Sequence name	Type	Repetition time (ms)	Echo time (ms)	Flip angle (degree)	Section thickness/re construction step (mm)	Pixel size (mm)	Number of slices	Echo spacing (ms)	Echo train length	Echo train duration (ms)	Phase partial fourier (%)	Field of view (mm)	Matrix size	Number of excitations	GRAPPA	Bandwidth (Hz/pixel)	Slice oversampling (%)	Scan time (min:s)
MR cisternography 1	3D T2 SPACE	15,000	3,200	90/ constant160	2.0/1.0	0.5×0.5	80	7.23	599	4,345	77	1 65 × 196	324 × 384	1.4	3	434	100	6:00
MR cisternography 2	3D T2 SPACE	15,000	2,000	90/ constant160	2.0/1.0	0.5×0.5	80	7.23	599	4,157	96	165 × 196	324 × 384	1.4	3	434	100	6:00
MR cisternography 3	3D T2 SPACE	4,000	540	90/ constant130	2.0/1.0	0.5×0.5	80	6.11	272	1,369	82	165 × 196	324 × 384	1.4	3	434	100	3:28

SPACE, Sampling perfection with application-optimized contrasts using different flip angle evolutions.

GRAPPA, GeneRalized autocalibrating partial parallel acquisition.

All three sequences utilize a restore magnetization pulse and slab selective excitation pulse.

3D slab is set in an axial orientation.