Active noise cancelling in near-infrared spectroscopy

Shahbaz Askari; Zoya J. R. Bastany; Guy A. Dumont; Babak Shadgan

doi:10.1117/12.2664609

6 March 2023 Active noise cancelling in near-infrared spectroscopy

Shahbaz Askari, Zoya J. R. Bastany, Guy A. Dumont, Babak Shadgan

Proceedings Volume 12375, Biophotonics in Exercise Science, Sports Medicine, Health Monitoring Technologies, and Wearables IV; 1237504 (2023) https://doi.org/10.1117/12.2664609
Event: SPIE BiOS, 2023, San Francisco, California, United States

Abstract

A modern application of NIRS moves towards implantable methods to overcome the limitation. In implantable NIRS, the sensor is implanted adjacent to the organ of interest. The implant's mechanical structure, shape, and total volume are crucial to ensuring usability and minimizing invasiveness. Since thinner and smaller implant encapsulation reduces the distance between the electronic circuit of the sensor and the tissue, the equivalent capacitance between the tissue and the implantable system (consisting of the sensor and controller) can increase dramatically. The CMV (Common-Mode Voltage) is a voltage on the patient's body due to electromagnetic and electrical coupling. CMV is an essential noise source for recording biological signals; however, implantable NIRS sensors can induce a more significant noise because of the higher capacitance effect. During the preamplifier, the CMV can appear and be transformed to differential voltage, contaminating the original signal and decreasing the signal-to-noise ratio. Electromagnetic Shielding and a high CMRR (Common-Mode Rejection Ratio) amplifier are conventional methods for preventing noise contamination with common-mode voltage. However, these methods are not robust enough to protect the signal of interest in the presence of high-amplitude CMV. We proposed the active CMV reduction technique to eliminate the effect of CMV and improve the SNR of the NIRS signal. It can measure and eradicate induced CMV by injecting a minimal amount of electric current into the patient non-invasively. This paper proposes an ANC (Active noise cancellation) electronic circuit that eliminates CMV.

Conference Presentation

Citation Download Citation

Shahbaz Askari, Zoya J. R. Bastany, Guy A. Dumont, and Babak Shadgan "Active noise cancelling in near-infrared spectroscopy", Proc. SPIE 12375, Biophotonics in Exercise Science, Sports Medicine, Health Monitoring Technologies, and Wearables IV, 1237504 (6 March 2023); https://doi.org/10.1117/12.2664609

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