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Figure 6. Calculated images from dynamic T2* weighted perfusion data in (a) a large meningioma and (b) a glioblastoma. The black and white scales illustrate the relative cerebral blood volume (rCBV) which can be seen to be elevated throughout the meningioma and also in the peripheral component of the glioma. Red areas illustrate abnormally high values of relative recirculation. None are seen in the meningioma, which is classically characterized by well-organized and well-developed vascular structures. In the glioblastoma a number of areas are seen in the deep part of the enhancing portion of the tumour adjacent to the non-enhancing components. This corresponds to areas where tumour staining would be seen on angiography and where flow can be anticipated to be irregular and slow.
