Ultrasound Based Respiratory Monitoring Evaluation Under Human Body Motions

摘要

A novel pulmonary monitoring system based on diaphragm wall motion tracking is proposed. Diaphragm motions are measured by a designed ultrasound sensory system with only one ultrasound PZT5 piezo transducer. We evaluate the accuracy and robustness of this technique in monitoring the diaphragmatic function and its contribution to respiratory workload. The ultrasound sensor is placed in the zone of apposition (ZOA). Measurements are referenced to a SPR-BTA commercial spirometer. In this study, we also evaluate inertial and photoplethysmography (PPG) sensors as two alternative methods in this area. All tests are done in non-stationary human body situation to evaluate the usage of sensors in a real life. According to the diaphragm motion tracking of the proposed method, the system is extremely insensitive to motion artifacts. Promising results were obtained for the proposed system from four different tests with an average sensitivity and specificity of 88% and 73.5% in respiration detection, respectively.