Lucas-Kanade法による心壁内腔面追跡とドプラデータに基づく左心室長軸断面内血流の復元

抄録

The Lucas-Kanade method, invented to represent an object’s displacement between successive images, was applied for tracking of a luminal surface of the left ventricle in echocardiographic images. To complement a variation in speckle patterns in the left ventricular wall caused by its deformation, a hill-climbing technique was used. Starting an image the resolution of which was reasonably lowered, we succeeded in tracking of the luminal surface of the left ventricle during cardiac cycle. Provided the velocity of the luminal surface and flow velocity data measured in a B-mode with Doppler echocardiography, hemodynamics in the long-axis plane of the left ventricle was well reconstructed. A series of flow velocity images well characterized general hemodynamic events such as formation of a vortex under the aortic valve in early diastole.