Table 1:

Measured concentration (mmol/kg) of the 5 quantified metabolites for a test-retest involving three subjects, referenced to an assumed creatine concentration of 8.00 mmol/kg. Subjects were scanned twice within the same session, then removed from the scanner and repositioned. Values reported are the means (± standard deviation) over the two intra-session scans.

Metabolite	Test-retest Volunteer 1		Test-retest Volunteer 2		Test-retest Volunteer 3
	Session 1	Session 2	Session 1	Session 2	Session 1	Session 2
tCho	2.77 ± 0.07	2.90 ± 0.14	3.42 ± 0.53	2.89 ± 0.01	2.80 ± 0.10	2.48 ± 0.08
GSH	1.88 ± 0.04	1.96 ± 0.07	0.67 ± 0.27	1.10 ± 0.20	1.84 ± 0.06	1.74 ± 0.01
Glx	9.66 ± 0.51	10.96 ± 0.25	13.03 ± 1.48	11.16 ± 0.80	11.45 ± 0.89	11.47 ± 1.96
NAA	10.38 ± 0.25	10.57 ± 0.31	10.29 ± 1.25	10.02 ± 0.00	10.60 ± 0.60	9.47 ± 0.22
ml	3.55 ± 0.55	3.71 ± 0.14	6.21 ± 0.58	5.42 ± 0.11	5.84 ± 0.55	4.99 ± 0.17