The Model Study And Clinical Application Of Magnetic Resonance Venography In The Lower Extremities

OBJECTIVE: To provide the basic reference for clinical practice by discussing the usage of Magnetic Resonce Imaging in the lower extremities by means of model and clinical study.METHODS: It includes two parts:model study and clinical practice study.The model study is analyzing the three relationship:(l)different speed and signal change,(2)different imaging angle and signal change,and (3) coeffect of different stenosis degree and imaging angle and signal change. The clinical part includes the application of theory and techniques,normal and abnormal MRV in the lower extremities,and the cause of artifacts and resolving methods.Move over,I analyze and assess MRV by way of comparing with other tomographies.RESULTS: 1.Model part:(l)Signal is different between static and flowing fluids on magnetic resonance machine when the speed is 0.4mm/sec (P=0.015),but naked eyes can't differentiate it. When the flowing speed is access to 1.2mm/sec,naked eyes'can do it.(2)For the measuring accuracy of machine can't meet the requirement of statistics,! only acquire the result of less measuring diameter than real condition when the imaging angle is lessthan 10? .(3)The angle has more influence on images along with more stenosis . 2.Clinical part:I analyze and assess the theory and techniques of MRV,clinical pratice of MRV and the disposing methods of different artifacts.More over,I compare MRV with other tomographic methods.CONCLUSIONS: 1 .There are different influence and effect on MRV imaging with different flowing speed,stenosis and imaging angle. 2.MRV in the lower extremities is practical,feasible and effective in clinical practice.