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A low-cost, portable, high-throughput wireless sensor system for phonocardiography applications
Akkarapol Sa-Ngasoongsong1, Jakkrit Kunthong, Venkatesh Sarangan
1School of Industrial Engineering & Management, Oklahoma State University, Stillwater, OK 74078, USA. akkarap@okstate.edu
Sensors (Basel, Switzerland)
|November 1, 2012
Summary
This study introduces a low-cost wireless sensor system for monitoring human heart sounds, offering a viable alternative to Bluetooth devices. The system effectively captures normal and abnormal heart sounds, even during exercise, with noise reduction capabilities.
Area of Science:
- Biomedical Engineering
- Signal Processing
- Wearable Technology
Background:
- Phonocardiography (PCG) traditionally relies on wired auscultation.
- Existing wireless PCG solutions often utilize Bluetooth, presenting opportunities for alternative technologies.
- Remote and mobile health monitoring necessitates cost-effective and portable sensing solutions.
Purpose of the Study:
- To design and test a novel, low-cost wireless sensor system for acquiring and monitoring human heart sounds.
- To evaluate the system's performance as a cost-effective alternative to existing wireless PCG sensors.
- To assess the system's capability in capturing various heart sounds and its effectiveness in noise reduction.
Main Methods:
- Development of an in-house wireless sensor system using a Microchip PICDEM developer kit and off-the-shelf components.
- Utilizing open-source software for remote and mobile data acquisition.
- Signal analysis using characterization techniques and Wavelet Transform for denoising.
- Experimental validation involving exercise testing with subjects to simulate varying heart conditions.
Main Results:
- The wireless sensor system demonstrates a small form factor (3.75 cm × 5 cm × 1 cm) and high throughput (6,000 Hz).
- The system successfully captures fundamental (S1, S2) and abnormal (S3, S4) heart sounds and murmurs without aliasing.
- Wavelet Transform effectively reduced environmental noise, and the system captured heart sounds during exercise across a heart rate range of 60-180 Hz.
Conclusions:
- The developed wireless sensor system offers a cost-effective, high-performance solution for phonocardiography applications.
- Its design facilitates remote and mobile monitoring of heart sounds, including under varying physiological conditions.
- The system's ability to capture detailed heart sound information and reduce noise makes it attractive for both clinical and research settings.
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