Table 1.

Summary of demographic, MRI system, and 3D T1 acquisition differences across MRI sites

	Site 1	Site 2	Site 3	Site 4	Site 5	Site 6	Site 7	Site 8	Site 9	Site 10	Site 11	Site 12	Site 13
MRI site location	Verona	Barcelona	Leipzig	Marseille	Essen	Naples	Genoa	Thessaloniki	Amsterdam	Lille	Toulouse	Chieti	Perugia
Subjects' age (range):mean ± SD, years	67.8 ± 9.9 (26)	74.6 ± 2.7 (6)	62.8 ± 2.6 (6)	66.0 ± 8.3 (20)	52.4 ± 1.5 (3)	59.0 ± 3.5 (9)	58.2 ± 2.2 (5)	56.6 ± 5.5 (5)	62.8 ± 8.2 (21)	64.2 ± 5.3 (13)	59.2 ± 4.5 (12)	68.8 ± 4.3 (11)	60.8 ± 10.3 (24)
Test‐retest days interval	28 ± 23	10 ± 3	13 ± 3	23 ± 22	11 ± 5	19 ± 15	24 ± 17	32 ± 8	11 ± 6	15 ± 11	14 ± 10	11 ± 5	10 ± 4
Gender, (females/N)	2/5	5/5	3/5	4/5	2/5	2/5	2/5	3/5	3/5	3/5	3/5	5/5	3/5
3T MRI scanner	Siemens Allegra	Siemens TrioTim	Siemens TrioTim	Siemens Verio	Siemens Skyra	Siemens Biograph mMR	GE HDxt	GE HDxt	GE Discovery MR750	Philips Achieva	Philips Achieva	Philips Achieva	Philips Achieva
MR system software version	VA25A	B17	B17	B17	D11	B18P	15 M4A	15 M4A	DV2 2.0a DV23.1	3.2.2	3.2.2	3.2.2	3.2.2
TX/ RX coil	Birdcage	Body/8‐chan.	Body/8‐chan.	Body/12‐chan.	Body/20‐chan.	Body/12‐chan.	Body/8‐chan.	Body/8‐chan.	Body/8‐chan	Body/8‐chan.	Body/8‐chan.	Body/8‐chan.	Body/8‐chan.
Parallel imaging:method, acceleration	None	GRAPPA 2	GRAPPA 2	GRAPPA 2	GRAPPA 2	GRAPPA 2	ASSET 2	ASSET 2	ASSET 2	SENSE 1.5	SENSE 1.5	SENSE 2	SENSE 2
TE (ms, shortest)	2.83	2.98	2.98	2.98	2.03	2.96	2.86	2.98	2.92	3.16	3.16	3.10	3.10
Acquisition time (min:sec)	9:50	5:12	5:12	5:12	5:12	5:03	4:43	4:40	4:14	6:50	6:50	6:08	6:08

^aAn operating system upgrade happened during the study in site 13. DV22 was used for the first volunteer and DV23.1 for the rest.