Based On The Three-dimensional Image Reconstruction Of The Magnetic Positioning System For Medical Ultrasound System And Display Method,

Accurate quantification of left-ventricular (LV) volume, mass and ejection performance is important in monitoring disease progression and determining prognosis in patients with heart disease. Conventional two-dimensional echocardiography (2DE) provides a limited view of the LV and makes assumptions about its shape that may cause error in studying abnormal ventricles. Three-dimensional echocardiography (3DE) can offer more diagnosing information than 2DE, allow to view 3D LV from any position and orientation and be more accurate and reproducible than 2DE in measuring LV volume, mass and ejection performance by avoiding geometric assumption.Each of existing methods of 3D echocardiography suffers from designing restrictions that limit its applicability to the clinical situations. A 3DE system that based on magnetic tracking system can real-timely acquire the ultrasound images for 3D reconstruction. This data acquisition can scan from any position and orientation freely, which not only can get data from the best acoustic windows by reducing the obstruction of the rib and the sternum, but also can combine the data from multiple acoustic windows. However, the randomly scanning causes the surface reconstruction to be more difficult.The kinds algorithms of 3D reconstruction from contours were discussed in this paper. A novel algorithm is proposed to reconstruct 3D surface from non-parallel contours. Without using a model whose topology is known for mesh fitting, the algorithm simplifies the 3D surface topology problem to 2D surface topology problem by projection. Then the best 3D surface topology is deduced using the minimum summing of spans criterion based on the "minimum offset" criterion which is proposed in this paper to determining the points links between two adjacent contours. The custom software is designed for 3D rendering using OpenGL interface. This software is interactive and can offer data format for I/O, which makes diagnosing information acquiring and saving be more convenient. The algorithm is tested using true organs contours and simulating contours. The results indicate that the output surface is reasonable and the algorithm is less time-consume. This reconstruction and rendering method make a substantial basement for the system's later implementation.