Table 3.

Top: Acquisition parameters for the 3T Siemens (Si) Skyra and Prisma scanners. Bottom: Test-retest reliabilities for selected ROIs, processed by Freesurfer. The ROIs are gray matter volume (GMV), subcortical gray matter volume (scGMV), cortex volume (cVol), cortical white matter volume (cWMV), and the volumes of the lateral ventricle (LV), amygdala (Amyg), thalamus (Thal), hippocampus (Hipp), caudate (Caud), and finally the estimated total intracranial volume (eTIV). Test-retest reliability is computed as within-site ICC(1,1)

	10	11	12	13	14	15
TR (ms)	2300	2300	2300	2300	2300	2000
TE (ms)	2.96	2.98	2.98	2.96	2.96	3.22
Strength (T)	3	3	3	3	3	3
TI (ms)	900	900	900	900	900	900
Flip Angle (°)	9	9	9	9	9	8
Make	Si	Si	Si	Si	Si	Si
Voxel Size (mm)	1×1×1	1×1×1.1	1×1×1	1×1×1	1×1×1	1×1×1
Distortion Correction	Y	N	Y	Y	Y	N
Parallel Imaging	2	-	2	2	2	2
FOV (mm)	256×256×176	240×256×176	240×256×176	240×276×156	256×256×176	256×208×160
Read Out Direction	HF	RL	HF	HF	HF	RL
Head coil # channels	20	32	20	20	20	32
Model	Prisma	Prisma fit	Skyra	Skyra	Skyra	Skyra
OS	D13D	VD13D	VD13	VD13	VD13C	VD13
Acq. Time (min)	05:09	07:46	05:12	05:12	05:09	04:56
orientation	sag	sag	sag	sag	sag	ax
# scans	22/22	24/24	25/25	23/24	23/24	22/22
Amyg (L)	.83	.89	.80	.85	.98	.89
Amyg (R)	.94	.92	.93	.85	.93	.84
Caud (L)	.99	.99	.98	.99	.98	.98
Caud (R)	.99	.96	.95	.95	.98	.97
GMV	.99	.98	.99	1	.99	.97
Hipp (L)	.94	.98	.99	.95	.97	.98
Hipp (R)	.91	.94	.97	.98	.95	.96
Thal (L)	.92	.87	.87	.76	.91	.89
Thal (R)	.74	.93	.80	.91	.93	.89
cVol	.99	.98	.98	1	.99	.96
cWMV	1	1	1	1	1	.97
eTIV	1	1	1	1	1	.97
scGMV	.98	.99	.98	.98	.99	.99