Table 4.

Summary of perfusion parameters versus tumor grade and subtype

Grade	Median nPH in NE lesion	75% nPH in NE lesion	Median nPH in CE lesion	75% nPH in CE lesion
ACII	0.87	1.19	0.53	1.19
N = 15/1	0.47–1.26	0.68–1.95	–	–
OAII	0.95	1.25	1.74	2.06
N = 13/1	0.59–1.37	0.91–2.08	–	–
ODII	1.24	1.57*	1.39	1.57
N = 21/3	0.83–2.27	0.55–2.49	1.32–2.03	1.55–2.49
III	1.20	1.63*	1.21	1.46
N = 22/10	0.49–1.89	0.77–3.07	0.91–4.60	1.05–4.96
IV	0.96	1.61*	1.68	2.60*
N = 49/46	0.20–2.16	0.61–3.02	0.79–5.20	1.03–6.55

The nPH values were normalized using the intensities from normal appearing white matter. Note that the median nPH values in normal gray matter are approximately 2.0 and that the median of the 75% nPH values in normal appearing white matter were 1.34 (range 1.22–1.58), 1.32 (range 1.20–1.53), and 1.42 (range 1.15–1.68) for patients with grade II, III and IV lesions, respectively

Values in the subpopulations marked with an asterisk were significantly different from the values in the other (P < 0.05)