Departments of Hemodynamic Analysis and Cardiovascular Surgery
Kitasato University School of Medicine
February 3, 2015
Vortex flow visualization in the cardiovascular system and its clinical applications
In the collaboration with industry and engineering, we have developed flow visualization systems from the clinical data and we have applied our system to several patients especially to those who underwent cardiovascular surgery. At first, we introduce the clinical application of the CFD (computational fluid dynamics) flow simulation based on patients imaging data, including CT (computed tomography) and MRI (magnetic resonance imaging), and then introduce phase contrast MRI (magnetic resonance imaging) and 4D flow MRI. CFD combined with computer graphics enables the “virtual surgery” to determine the optimal surgical procedure. 4D flow MRI enables visualization of detail flow such as false lumen of the dissected aorta. Based on these novel technologies, several hemodynamic parameters become available, including flow energy loss and wall shear stress. Because echocardiography is non-invasive and portable, clinical applications are expected, and we have developed echocardiography flow visualization method Vector Flow Mapping (VFM) based on the continuity equation applied to the color Doppler method. The insights from VFM revealed normal left ventricular vortex flow patterns and how they change after the valve surgery. We aim at clinical applications such as estimation of cardiac workload caused by the inefficient flow, or determination of the optimal patients managements.