Fig 1.

CBV maps generated by using all algorithms. Representative cases with grade II, III, and IV tumors are shown. All CBV maps are displayed with identical color bar, in which the window width is set to ten times of CBV in the normal white matter, and window level is set to half window width. Grade III and IV tumors have higher CBV than grade II tumor for all algorithms. The degree of CBV increase in the tumors (not only high grade, but also grade II tumors) and the amount of image noise differs between some software and algorithms. CE-T₁WI, contrast enhanced T₁ weighted images; T₂WI, T₂ weighted images; AUC, area under the curve; SVD, singular value decomposition