Fig 2. Conventional T2-weighted images and axial T1 images with and without Gd-DTPA. The perfusion maps obtained with T2DSC in a 60-year-old patient with parietal falx meningioma (patient 8, same as Fig 1). A, Sagittal T2-weighted image. B, T1-weighted image. C, Post-Gd-DTPA T1-weighted image. D, T2DSC perfusion image (rCBF map). E, T2DSC perfusion image (rCBV map. F, T2DSC perfusion image (MTT map). The tumor shows higher signal intensity than the cortex as well as enhancement on T2-weighted and post-Gd T1-weighted images. Dural tail sign is apparent in the anterior aspect of tumors. Note that the tumor protrudes into bone through the dura matter and cortical layers. The hyperperfusion signals are apparent on perfusion maps obtained with T2DSC, rCBF, and rCBV. Note that the MTT of tumor region has a slightly longer transit time relative to the parenchyma region.