TABLE 7.

Actual volumes per brain structure for all three MRI systems.

Brain structures	Volumes (mean ± SD, in mL)
	Achieva	Ingenia	GE	All scanners	p-value
Whole brain	1139.77 ± 130.19#	1132.64 ± 129.54#•	1142.20 ± 132.82•	1138.20 ± 126.33	<0.001
Gray matter	683.08 ± 80.55∧	679.19 ± 81.76•	649.16 ± 87.20∧•	670.47 ± 81.77	<0.001
Cortical gray matter	650.81 ± 79.06∧	646.72 ± 80.56•	620.57 ± 85.32∧•	639.37 ± 79.99	<0.001
White matter	456.69 ± 52.48∧	453.45 ± 50.43•	493.04 ± 53.18∧•	467.73 ± 53.43	<0.001
Frontal cortex	180.02 ± 24.40∧	179.09 ± 23.39•	168.67 ± 24.96∧•	175.93 ± 23.99	<0.001
Parietal cortex	111.81 ± 14.35∧	111.75 ± 14.45•	105.07 ± 17.05∧•	109.54 ± 15.14	<0.001
Temporal cortex	118.04 ± 13.45∧	116.31 ± 14.46	115.25 ± 15.29∧	116.54 ± 13.97	<0.001
Hippocampus, total	6.89 ± 1.00	6.92 ± 0.99	6.92 ± 0.93	6.91 ± 0.94	0.716
Hippocampus, left	3.35 ± 0.49	3.38 ± 0.50	3.46 ± 0.47	3.40 ± 0.47	0.006
Hippocampus, right	3.54 ± 0.54∧	3.55 ± 0.51•	3.45 ± 0.48∧•	3.51 ± 0.49	<0.001
Lateral ventricles	34.67 ± 12.13#	35.44 ± 12.91#•	34.55 ± 12.12•	34.89 ± 11.96	<0.001

Actual volumes (Volumes, mL) computed by icobrain dm were reported as mean ± SD. Achieva: Philips Medical Systems Achieva dStream 1.5T. Ingenia: Philips Medical Systems Ingenia 3T. GE: GE Discovery MR750w 3T. p-value: Difference between the three scanner types. Post-hoc comparison: ^∧p-value < 0.005 between Achieva and GE. ^•p-value < 0.005 between Ingenia and GE. ^#p-value < 0.005 between Achieva and Ingenia.