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Development of wireless NIRS system with dynamic removal of motion artifacts

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Abstract

Purpose

Along with recent advances in neuroscience, near-infrared spectroscopy (NIRS) has been widely used to measure changes in cerebral oxygenation non-invasively. An NIRS system can be constructed to be portable unlike other imaging modalities, but its signals are often distorted by artifacts generated by arterial pulsation, vasomotion and head motion. To overcome these problems, we have developed a wireless NIRS system with a real time accelerometer that allows noise reduction.

Methods

Our wireless NIRS system includes a microcontroller, a Bluetooth communication, a fPCB (flexible printed circuit board), an accelerometer, batteries, LEDs (light emitting diode) and PDs (photodiode). Distorted signal caused by head motion was removed by active noise cancellation (ANC) algorithm.

Results

Two different tasks, arterial occlusion and brain hypoxia, were tested to validate the performance of our system. During arterial occlusion and breath holding, the NIRS signal showed corresponding hemodynamic changes such as increase in deoxy-hemoglobin (Hbr) and decrease in oxy-hemoglobin (HbO2) concentrations. Signal distortions generated by head motion were effectively removed.

Conclusions

Wireless NIRS system combined with real time noise cancellation algorithm has great potential to be utilized in brain-computer interface (BCI) for physically challenged people, dynamic exercise tasks and cognitive studies for children. Furthermore we expect the system will be highly applicable in neuroscience.

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Authors and Affiliations

  1. Department of Biomedical Engineering, Korea University, Seoul, 136-703, Korea

    Choong-Ki Kim, Dalkwon Koh & Beop-Min Kim

  2. Department of Biomicrosystem Engineering, Korea University, Seoul, 136-703, Korea

    Seungduk Lee

Authors
  1. Choong-Ki Kim
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  2. Seungduk Lee
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  3. Dalkwon Koh
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  4. Beop-Min Kim
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Correspondence to Beop-Min Kim.

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Kim, CK., Lee, S., Koh, D. et al. Development of wireless NIRS system with dynamic removal of motion artifacts. Biomed. Eng. Lett. 1, 254–259 (2011). https://doi.org/10.1007/s13534-011-0042-7

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  • DOI: https://doi.org/10.1007/s13534-011-0042-7

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