Table 3. Correlation between perfusion parameters and iodine concentration.

	Average value±s.d.
	Tumor	GM	Pearson's correlation coefficient	95% Confidence interval
CBF (mL/min per 100 g)	51.53±4.84	25.00±3.12	r=0.594	α=0.452, 0.706
CBV (mL/100 g)	5.01±0.43	1.86±0.20	r=0.627	α=0.494, 0.732
MTT (seconds)	7.89±0.65	6.08±0.65	r=0.516	α=0.359, 0.645
Recalculated MTT (seconds)	5.68±1.52	4.38±1.34	r=0.593	α=0.503, 0.739
PS (mL/min per 100 g)	11.13±1.41	2.45±0.51	r=0.673	α=0.551, 0.766
E	0.21±0.03	0.09±0.02	r=0.575	α=0.430, 0.692

CBF, cerebral blood flow; CBV, cerebral blood volume; MTT, mean transit time; PS, permeability surface; E, extraction efficiency; GM, gray matter.

Summary of perfusion parameters (CBF, CBV, MTT, recalculated MTT, PS, and E) computed in metastasis and gray matter averaged over all patients. Correlation results between perfusion parameters and iodine concentration. r: Pearson's linear correlation coefficient and α: 95% confidence interval.