| Summary: | 碩士 === 國立中山大學 === 資訊工程學系研究所 === 96 === Magnetic resonance imaging (MRI) is an useful technique that provides a noninvasive method in clinical applications. For the patient of tetralogy of Fallot (TOF) after repaired, turbulence and regurgitation in blood flow may appear in pulmonary arteries. In this study, phase contrast MR imaging was applied and vortical flow patterns in the pulmonary arteries of patients after repair of TOF has been investigated. There are two major part of this study. Firstly we simulated vortical flow patterns of star, focus, and saddle which are most frequently appeared in blood flow. Quadrant index has been proposed for pattern analysis. In the second part we applied these parameters to in vivo data of repaired TOF patients, and compared with other parameters such as vorticity, coefficient of variance (CV), and regurgitant fraction (RF).
Our result shows that the linear correlation between the mean of CV of velocity and mean of CV of vorticity in right pulmonary artery (RPA) as well as pulmonary trunk (PT) is larger than that in left pulmonary artery (LPA). This study shows that vorticity may provide some useful information of flow patterns and therefore helps doctors in clinical diagnosis
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