Diffusion tensor imaging in diagnosis of meningioma and astrocytoma

Magnetic resonance diffusion tensor imaging(DTI) is a new water imaging technology developed on the basis of diffusion-weighted imaging(DWI), by measuring the apparent diffusion coefficient(ADC) and fractional anisotropy(FA) to quantify the water molecules speed and direction within the organization, reflect the white matter fiber bundle pathologic state and it's relationship with the neighboring tumor, identify the benign and malignant tumors, provide valuable information for instituting clinical surgery program and evaluating the prognosis.