A comparative study of photoplethysmogram and piezoelectric plethysmogram signals
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SCIENTIFIC PAPER
A comparative study of photoplethysmogram and piezoelectric plethysmogram signals Qasem Qananwah1 · Ahmad Dagamseh2 · Hiam Alquran1 · Khalid Shaker Ibrahim3 · Moh’d Alodat4 · Oliver Hayden5 Received: 26 January 2020 / Accepted: 23 August 2020 © Australasian College of Physical Scientists and Engineers in Medicine 2020
Abstract The Photoplethysmogram (PPG) signal is one of the most important vital signals in biomedical applications. The non-invasive property and the convenience in the acquisition of both PPG and Piezoelectric Plethysmogram (PZPG) signals are considered as powerful and accurate tools for biomedical diagnosing applications, such as oxygen saturation in blood, blood flow, and blood pressure measurements. In this paper, a number of features for PPG and PZPG signals (ex. first derivative, second derivative, area under the curve and the ratio of systolic area to the diastolic area) are acquired and compared. The results show that both systems are able to extract the pulse rate (PR) and pulse rate variability (PRV), accurately with an estimation error of less than 10%. The averaged standard deviation of the ratio of the systolic area to the diastolic area for the first derivative of PPG and PZPG signals was small with less than 0.49 and 0.69 for the PPG and PZPG, respectively. Statistical analysis techniques (such as cross-correlation, P-value test, and Bland Altman method) are performed to address the relation between the PPG and PZPG signals. All of these methods showed a strong relationship between the features of the two signals (i.e. PPG and PZPG). The correlation value is found to be 0.954 with a p-value of
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