Table 2.

T₁ and T₂ relaxation times measured for 17 metabolites and 20 chemical groups on 6 different biopsies: normal cerebral cortex (n = 2), oligodendroglioma (n = 2), glioblastoma (n = 2)

	Biopsy T1 (s)	Solution T1 (s)	Biopsy T2 (s)	Solution T2 (s)	Biopsy CPMG signal loss	Solution CPMG signal loss
Acetate_1.92ppm	2.49 ± 0.15	3.20	1.42 ± 0.05	2.61	0.23 ± 0.02	0.28
Alanine_1.48ppm	0.92 ± 0.02	1.05	0.70 ± 0.04	0.83	0.13 ± 0.01	0.12
Ascorbate_4.52ppm	1.17 ± 0.03	1.78	0.63 ± 0.07	1.47	0.16 ± 0.01	0.14
Choline_3.22ppm	1.27 ± 0.08	1.45	1.09 ± 0.06	1.15	0.11 ± 0.01	0.11
Creatine_3.94ppm	0.71 ± 0.03	0.80	0.57 ± 0.06	0.69	0.15 ± 0.01	0.13
Creatine_3.03ppm	1.34 ± 0.05	1.49	0.89 ± 0.06	1.22	0.14 ± 0.01	0.12
GABA_1.90ppm	0.83 ± 0.06	1.17	0.40 ± 0.06	0.92	0.21 ± 0.02	0.12
Glutamate_2.09ppm	0.68 ± 0.02	0.68	0.39 ± 0.02	0.58	0.21 ± 0.01	0.15
Glutamine_2.14ppm	0.62 ± 0.01	0.72	0.45 ± 0.02	0.58	0.19 ± 0.01	0.15
Glutamine_2.45ppm	0.72 ± 0.02	0.79	0.55 ± 0.03	0.64	0.16 ± 0.01	0.14
Glycerophosphocholine_3.24ppm	0.57 ± 0.03	0.59	0.50 ± 0.02	0.46	0.18 ± 0.01	0.19
Glycine_3.56ppm	1.49 ± 0.05	2.05	0.89 ± 0.12	1.85	0.15 ± 0.01	0.16
Lactate_1.33ppm	0.99 ± 0.05	1.15	0.65 ± 0.06	0.77	0.15 ± 0.01	0.13
Lactate_4.12ppm	1.68 ± 0.14	3.43	0.53 ± 0.05	0.57	0.23 ± 0.01	0.39
Myo‐Inositol_4.05ppm	0.83 ± 0.02	1.19	0.45 ± 0.02	0.92	0.19 ± 0.01	0.12
NAA_2.02ppm	1.02 ± 0.06	1.09	0.60 ± 0.05	0.76	0.16 ± 0.01	0.13
Phosphocholine_3.23ppm	0.62 ± 0.02	0.65	0.50 ± 0.02	0.53	0.17 ± 0.01	0.16
Taurine_3.42ppm	1.33 ± 0.09	1.64	0.81 ± 0.07	1.34	0.14 ± 0.01	0.13
Valine_1.04ppm	0.67 ± 0.06	0.68	0.52 ± 0.01	0.61	0.17 ± 0.00	0.14
Scyllo‐Inositol_3.34ppm	0.87 ± 0.02	1.40	0.53 ± 0.03	0.93	0.17 ± 0.01	0.14

The value of T₁ and T₂ for the pure metabolite is also reported. The last 2 columns show the signal loss expected during a CPMG experiment for the 17 metabolites in a biopsy and in a pure solution, taking into account both T₁ and T₂ effects.