Motion Artifact-Free Magnetoplethysmogram

摘要

A Magnetoplethysmogram (MPG) is obtained by placing a permanent magnet in proximity to a blood vessel such as radial artery and the resulting magnetic flux detected using a flux sensor. It is investigated here and shown that if either the magnet or the sensor is in contact with the skin, the resulting MPG is affected by artifacts. To eliminate such artifacts, a noncontact MPG sensor system is devised and implemented to obtain artifact free MPG. Measurements with MPG sensor in contact and without contact with the skin, obtained from 6 volunteers, establish that the MPG signals obtained using the sensor in contact with the skin is indeed affected by artifacts.