Table 2.

Scanner characteristics.

Center	Model	Manufacturer	TR [s]	TE [s]	Volumes	Voxel size [mm3]	Gap [mm]
I	TrioTim	Siemens	2.61	0.030	200	3 × 3 × 3.6	0.6
II	Verio	Siemens	3	0.030	120	2 × 2 × 2.6	0.6
III	Verio	Siemens	2.58	0.030	180	3.5 × 3.5 × 3.5	0
IV	Trio	Siemens	3	0.030	120	3.28 × 3.28 × 4.4	0.4