We have developed a novel method for accurately measuring the velocity signals on the multiple points preset on an ultrasonic beam in the heart wall by tracking the movement of the heart wall. By applying the time-frequency analysis to the resultant velocity signals of the heart wall, we have determined the instantaneous eigen-frequency of the left ventricle (LV) at the end-diastole. From the eigen-frequency, the wall thickness of the LV, and the average radius of the LV, the inner pressure of the LV is noninvasively estimated at the end-diastole using a model of an elastic spherical shell. For this measurement, however, it is necessary to confirm the mode of the eigen-vibration in the LV. In this report, therefore, we control the directions of the ultrasonic beams so that the velocity signals are simultaneously measured at the multiple points on the surface of the LV wall. From these data, we estimate the spatial distribution of the eigen-vibration of the LV wall at the end-diastole.
|Number of pages||4|
|Journal||Proceedings of the IEEE Ultrasonics Symposium|
|Publication status||Published - 1998 Dec 1|
|Event||Proceedings of the 1998 International Ultrasonics Symposium - Sendai, Miyagi, Jpn|
Duration: 1998 Oct 5 → 1998 Oct 8
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