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