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Table 1: Mean values and SDs of perfusion parameters in differentiating malignant lesions of the brain
Contrast-Enhancing Lesion Perienhancing Lesion
rCBV Mean PSR Ratio Max PSR Ratio Min PSR Ratio rCBV Mean PSR Ratio
Lymphoma 2.43 ± 1.19 113.15 ± 41.59 158.86 ± 87.06 89.57 ± 23.63 0.87 ± 0.17 99.80 ± 25.33
GBM 4.72 ± 2.19 78.22 ± 14.27 87.06 ± 13.16 66.04 ± 16.24 1.39 ± 0.51 93.00 ± 10.50
Metastases 2.93 ± 1.18 53.46 ± 12.87 55.76 ± 12.56 41.82 ± 12.95 0.48 ± 0.26 80.97 ± 8
P value lymphoma from GBM .000 .001 .000 .015 .002 .16
P value GBM vs metastases .021 .000 .000 .000 .001 .000
F (ANOVA) >11.1 >29.9 >23.4 >39.3 >18.4 >7.2

	Contrast-Enhancing Lesion				Perienhancing Lesion
	rCBV	Mean PSR Ratio	Max PSR Ratio	Min PSR Ratio	rCBV	Mean PSR Ratio
Lymphoma	2.43 ± 1.19	113.15 ± 41.59	158.86 ± 87.06	89.57 ± 23.63	0.87 ± 0.17	99.80 ± 25.33
GBM	4.72 ± 2.19	78.22 ± 14.27	87.06 ± 13.16	66.04 ± 16.24	1.39 ± 0.51	93.00 ± 10.50
Metastases	2.93 ± 1.18	53.46 ± 12.87	55.76 ± 12.56	41.82 ± 12.95	0.48 ± 0.26	80.97 ± 8
P value lymphoma from GBM	.000	.001	.000	.015	.002	.16
P value GBM vs metastases	.021	.000	.000	.000	.001	.000
F (ANOVA)	>11.1	>29.9	>23.4	>39.3	>18.4	>7.2