Fundamentals of Camera-PPG Based Magnetic Resonance Imaging

Wang, Wenjin; Weiß, Steffen; Brinker, A.C. den; Wuelbern, Jan Hendrik; Tormo, Albert Garcia I; Pappous, Ioannis; Sénégas, Julien

doi:10.1109/jbhi.2021.3136603

Cited by 5 publications

(1 citation statement)

References 36 publications

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“…This overshoot of the QRS complex causes inaccurate synchronization, leading to less sharp images and prolonged examinations [4]. Alternatives to MR-compatible ECG are methods such as photoplethysmography [5] or acoustic systems [6], which are fully immune to electromagnetic fields. In addition to monitoring cardiac activity in the MR environment, respiratory monitoring is also performed, where the tunnel environment can cause hyperventilation due to the shortness of breath (dyspnea) [7].…”

Section: Introductionmentioning

confidence: 99%

FBG Sensor for Heart Rate Monitoring Using 3D Printing Technology

Fajkus,

Kostelansky,

Fridrich

et al. 2024

IEEE Access

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Currently, the use of fiber-optic Bragg gratings in biomedical applications, especially in the field of magnetic resonance imaging (MRI), is becoming popular. In these applications, the fiber Bragg grating (FBG) encapsulation plays a crucial role in terms of the accuracy and reproducibility of the measurements. This paper describes in detail the fabrication method of a prototype FBG sensor, which is realized by encapsulating a Bragg grating between two layers of the MR-compatible material Acrylonitrile Butadiene Styrene (ABS) by 3D printing. The sensor thus created, implemented, for example, on the chest of a human body, enables monitoring of the vital functions of the human body. The paper describes the complete procedure for the creation of the prototype sensor, including strain and temperature dependence, as well as results of long-term experimental measurements against the conventional electrocardiography (ECG) standard. Results based on the objective Bland-Altman (B-A) method confirm that the implemented sensor can be used for reliable monitoring of cardiac activity (>95% based on B-A). Taking into account the single fiber optic cable, its simple implementation, its small size and weight < 5g, the presented sensor represents an interesting alternative to conventional ECG.INDEX TERMS fibre Bragg grating, 3D printing, vital sign monitoring, heart rate, MR-compatible.

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