Abstract
In this paper, we apply the previously proposed continuous distance transform neural network (CDTNN) to represent 3-D endocardial (inner) and epicardial (outer) contours and quantitatively estimate the motion of left ventricles of human hearts from ultrasound images acquired using transesophageal echo-cardiography. This CDTNN has many good properties as the conventional distance transforms, which are suitable for 3-D object representation and deformation estimation. We have successfully represented the 3-D epicardia and endocardia of left ventricles using CDTNNs trained by as few as 7.5% of the manually traced data. The mean absolute error in the testing for one patient over the 27 testing planes were (1.4 ± 1.2 mm) for the endocardium, (1.3 ± 1.0 mm) for the epicardium at end diastole and (1.4 ± 1.2 mm) for the endocardium vs. 1.2 ± 1.0 mm for the epicardium at end systole. The absolute error measured compares favorably with the human inter-observer variability reported for analyzing distances. With this unique distance transform representation that is continuous and differentiable, we are also able to systematically and effectively measure the amount of 3-D heart motion in terms of affine transform.
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Tseng, YH., Hwang, JN. & Sheehan, F.H. 3-D Heart Modeling and Motion Estimation Based on Continuous Distance Transform Neural Networks and Affine Transform. The Journal of VLSI Signal Processing-Systems for Signal, Image, and Video Technology 18, 207–218 (1998). https://doi.org/10.1023/A:1007981013458
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DOI: https://doi.org/10.1023/A:1007981013458