Table 4.

rCBF measurements from PET and CT scanning (n = 8)

	Tumour			Tumour normalized
	PET	CT	r 2	PET	CT
Total low-grade tumours	18.4 ± 8.3	32.9 ± 15.8	0.35 ± 0.5	1.2 ± 0.4	1.1 ± 0.4
Total high-grade tumours	21.5 ± 7.0	81.5 ± 15.4	0.11 ± 0.1	1.6 ± 0.5	2.7 ± 0.5

Tumour tissue perfusion in absolute measures and normalized to white matter, stratified according to WHO classification (Table 1), and listed as mean ± SD. Low grade: I-II (patients 1, 3, 4), high grade: III-IV (patients 2, 5, 7, 8, 10). Patient 6 excluded because of tumour type (meningioma). Patient 9 excluded as an outlier

Blood flow is given in ml min⁻¹ 100 ml⁻¹. Ratios are volume weighted