These factors have a negative influence on the subject’s cardiovascular system and evocate a mental stress that can be detected and evaluated by continual monitoring of blood pressure (BP) and heart rate (HR) parameters. Additional testing shows that the BT transmission in the scanning area has no visible influence on the quality of the finally obtained scanner images.ĭuring a non-invasive medical examination in a magnetic resonance imaging (MRI) scanner, patients are exposed to the mechanical vibration of the gradient-coil system and the resulting acoustic noise. Measurement experiments inside the scanning area of the running weak field magnetic resonance scanner verify proper function and practical usability of sensed PPG signals for further processing and analysis in all three prototype cases. The supplementary investigation certifies the necessity of the placement of the pressure cuff of the BPM device on the opposite arm than the tested PPG sensor. Comparative measurements in laboratory conditions by certified commercial pulse oximeter and blood pressure monitor (BPM) devices show good stability and proper accuracy of finally determined heart rate values. The main aim of the current work was motivated by finding suitable and universal parameter settings for PPG signal real-time recording in different working mode conditions. The tested prototypes differ in the used optical part of the PPG sensor and their working mode, control unit, power supply, and applied Bluetooth (BT) communication methods. This paper is focused on investigation of three developed prototypes of sensors based on the photoplethysmography (PPG) principle for continual measurement of the PPG signal in the magnetic field environment with the inherent radiofrequency and electromagnetic disturbance.
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