Novel Cardiac Workload Evaluation System Based on Echocardiography and MRI Flow Visualization Method and its Application to the Cardiovascular Disease in Elderly Patients

为了开发基于超声心动图和心脏MRI的老年患者心脏负荷评估系统，我们首先开发了基于超声心动图和心脏MRI的血流可视化方法。已经建立了超声心动图VFM（矢量流标测），并且还使用PC（相位对比）MRI创建了MRI血流可视化软件。从可视化的血流速度矢量场，我们开发了一个系统来计算流动能量损失。将这些系统应用于主动脉瓣返流病例，其中3例进行了超声心动图检查，3例进行了MRI检查。结果表明，反流射流引起的能量损失与左心室内的血流碰撞密切相关。

For the development of the cardiac workload evaluation system in elderly patients based on the echocardiography and cardiac MRI, we at first, developed blood flow visualization method using echocardiography and cardiac MRI. Echocardiography VFM (vector flow mapping) has been established and MRI blood flow visualization software has been also created using PC (phase contrast) MRI. From the visualized blood flow velocity vector field, we developed a system to calculate flow energy loss. Then we applied these systems to aortic valve regurgitation cases, and 3 cases were evaluated with echocardiography, and other 3 cases were evaluated with MRI. From the results, flow energy loss caused by the regurgitation jet was proven to be closely related to the flow collision with transmitral flow in the left ventricle.