Table 4.

Median and interquartile range (IQR) of the intra and interscanner PBVC measures for PV and GM (in %)

	1.5T Intera		3T Achieva		1.5T versus 3T
	Median	IQR	Median	IQR	Median	IQR
GM MSmetrix	−0.047	0.10	0.013	0.12	−0.52	0.70
PV MSmetrix	−0.036	0.14	0.023	0.12	−0.061	0.72
PV Siena	−0.056	0.12	−0.033	0.19	2.99	0.85
Wilcoxon PV	0.47		0.078		0.0002

PV, parenchymal volume; GM, gray matter; PBVC, percentage brain volume change.