Improvement of Image Quality on Medical Ultrasonic Echocardiogram

Medical ultrasonic echocardiogram contains two undesirable components. One is the drift or offset in low frequency range which shapes the background of whole part of image. The other is small amplitude noise in high frequency range which becomes the factor of comparatively local degradates. This paper desribes a method of the improvement of image quality by removing the above-mentioned two factors. First, we detect the background in the low frequency range by using linear programming, and we suppress the drift and offset by substracting the background from original image. Second, we remove the low amplitude noise by using spline filter which belongs to non-linear filter. At the end of this paper, the usefulness of this method is demonstrated to show some examples.