TABLE 5:

Perfusion MR measure and metabolite ratios for low- and high-grade gliomas and normal values

Technique and Measure	Low-Grade Glioma (n = 40)			High-Grade Glioma (n = 120)			P Value^*
Technique and Measure	Range	Mean	SD	Range	Mean	SD	P Value^*
Perfusion MR imaging
rCBV	0.77–9.84	2.14	1.67	0.96–19.80	5.18	3.29	< 0.0001
MR Spectroscopy
Cho/Cr	0.85–4.00	1.75	0.60	0.83–13.80	2.43	1.92	0.0121
Cho/NAA	0.60–6.80	1.96	1.43	0.53–28.90	3.22	3.65	0.001
NAA/Cr	0.33–3.60	1.20	0.71	0.10–3.93	0.90	0.62	0.0038
Normal values^†
Cho/Cr	0.43–1.37	0.88	0.19	0.44–2.00	0.87	0.24	0.425
NAA/Cr	1.11–2.89	1.72	0.41	0.45–4.74	1.73	0.51	0.958