| Summary: | 碩士 === 大葉大學 === 機械工程研究所碩士班 === 93 === ABSTRACT
In this study, phase contrast cine magnetic resonance imaging is used to investigate three-directional velocity data for the thoracic aorta of the healthy human and the , and to discuss the distribution of wall shear stresses and the characteristic of the aortic field. B-spline curve techniques was used to estimate the position of vessel boundary initially. A novel technique of maximum curvature of velocity profiles was developed to determine the final vessel boundary and the distribution of wall shear stress along two side of thoracic aorta. It is found that both of the maximum wall sheer stress happen at the proximity of the aorta arch , where the aorta dissection type Ⅲ occurs . Finally, OSI（Oscillating Shear Index）is calculated to observe degree of back blood flow .
Keywords： MRI , B-spline , Wall shear stress , aorta dissection ,OSI
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