磁共振扩散张量成像在诊断脑膜瘤及星形细胞瘤中的应用

磁共振扩散张量成像（diffusion tensor imaging,DTI）是在扩散加权成像（diffusion-weighted imaging, DWI）基础上发展起来的一种水成像新技术，是通过测定表观扩散系数（apparent diffusion coefficient, ADC）和各向异性分数（fractional anisotropy, FA）来量化组织内水分子的扩散速度和方向，反映脑白质纤维束病理状态及其与邻近肿瘤关系，进而鉴别肿瘤良恶性，为临床制定手术方案和预后评估提供有价值的信息。

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 eoefficient （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.