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磁共振弥散张量成像（ DTI）是在MR－DWI基础上发展起来的新的磁共振功能成像技术，能无创检测活体组织的微观结构及其变化。 DTI联合神经纤维束示踪成像（ DTT）技术在中枢神经系统中的研究较多，在周围神经系统中的研究也正迅速发展，现综述DTI及DTT成像技术的基本原理及其在腰骶神经根检查中的应用进展。“,”Magnetic resonance diffusion tensor imaging ( DTI) is a new functional magnetic resonance imaging tech-nique developed in MR based on DWI, to micro structure and change detection in living tissue.Tracer imaging DTI combined with nerve fiber bundle ( DTT) in the central nervous system of technology, research in the peripheral nervous system is also developing rapidly, the basic principle of this review DTI and DTT imaging technology and its application in lumbosacral nerve roots in the inspection.