Table 1.

Summary of proton density acquisition protocols.

Sequence Type	SE (VEMP)	FSE	TSE/FSE	FSE
Scanner manufacturer	GE	GE	SIEMENS/ PHILIPS/GE	GE
Field strength (T)	1.5	1.5	3	3
Receive coil	8CH HEAD	8CH HEAD	32CH HEAD/ 8CH HEAD/ 8CH HEAD	8CH HEAD
In-plane resolution	1mm x 1mm	1mm x 1mm	1mm x 1mm	0.5mm x 0.5mm
Slice thickness (mm)	5mm	3mm	3mm	3mm
Number of slices	27	42	54/55/50	52
TR (ms)	2000	3400	3000/3500/5700	5300
TE (ms)	20	11–12	11/15/12	23
Flip angle (degree)	90	90	150/90/90	90
Number of scans with these specifications	107	Total at 1x1x3=150		5

Two scans were acquired at 0.3x0.3x0.3, four scans at 1x1x1 and one scan at 0.5x0.5x0.5.

Abbreviations. ch: channel; SE: spin echo; VEMP: variable echo multiplanar; FSE: fast spin echo; TSE: turbo spin echo; TR: repetition time ; TE: echo time; TI: inversion time