Portable echography devices are developed widely. In spite of advantage of being used in disaster stricken area or patient house, portable echography devices have less capability in function compared with that of ordinary size echography. Therefore, we developed 3D shape reconstruction system from some number of contour lines of left ventricle obtained by image processing technique. Radial Basis Function is used to interpolate the shape between contour lines and Marching Cubes algorism is used to extract the surface of left ventricle and approximate it as a triangular set. In this paper, the three-dimensional shape of the left ventricle in systolic phase and diastolic phase are reconstructed by synchronizing electrocardiogram wave pattern with an automatic extraction program of the left ventricle of the heart which we have developed. As a result of ejection fraction calculation by using each shape, this system can output value that was effective for diagnosis. Furthermore, it is considered that we can utilize a portable diagnosis device effectively by applying this system to the follow-ups of the size of the tumor.
