Mr. Hao Wang Profile

Hao Wang

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Proceedings Article | 28 July 2017 Paper

Influence of the measuring condition on vibrocardiographic signals acquired on the thorax with a laser Doppler vibrometer

L. Mignanelli, G. Bauer, M. Klarmann, H. Wang, C. Rembe

Proceedings Volume 10411, 1041105 (2017) https://doi.org/10.1117/12.2282894

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Velocity signals acquired with a Laser Doppler Vibrometer on the thorax (Optical Vibrocardiography) contain important information, which have a relation to cardiovascular parameters and cardiovascular diseases. The acquired signal results in a superimposition of vibrations originated from different sources of the human body. Since we study the vibration generated by the heart to reliably detect a characteristic time interval corresponding to the PR interval in the ECG, these disturbance have to be removed by filtering. Moreover, the Laser Doppler Vibrometer measures only in the direction of the laser beam and, thus, the velocity signal is only a projection of the tridimensional movement of the thorax. This work presents an analysis of the influences of the filters and of the measurement direction on the characteristic time interval in Vibrocardiographic signals. Our analysis results in recommended settings for filters and we demonstrate that reliable detection of vibrocardiographic parameters is possible within an angle deviation of 30° in respect to the perpendicular irradiation on the front side of the subject.

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