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Related Experiment Videos

Experimental Study of Radiation Efficiency from an Ingested Source inside a Human Body Model*.

Yawen Chan1, Max -H Meng, K-L Wu

  • 1Department of Electronic Engineering, Chinese University of Hong Kong, Shatin, NT, Hong Kong.

Conference Proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference
|February 7, 2007
PubMed
Summary

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This study estimates human body trunk attenuation for internal biomedical telemetry systems. Results show specific radio frequency bands are suitable, offering a reference for device design.

Area of Science:

  • Biomedical Engineering
  • Radio Frequency Engineering
  • Human Body Modeling

Background:

  • Internal biomedical telemetry systems require understanding radio frequency (RF) signal attenuation through the human body.
  • Accurate attenuation data is crucial for designing reliable wireless communication for ingested or implanted devices.

Purpose of the Study:

  • To estimate the attenuation of the human body trunk for RF signals from 100 MHz to 6 GHz.
  • To identify suitable radio frequency bands for biomedical telemetry systems based on attenuation characteristics.

Main Methods:

  • A simplified experimental model of the human body trunk was used.
  • The model was filled with distilled water, saline solution, and porcine tissue to measure signal attenuation.
  • Attenuation was measured across a frequency range of 100 MHz to 6 GHz.

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Main Results:

  • Saline solution exhibited higher attenuation than water due to increased conductivity.
  • Porcine body tissue showed attenuation values between those of saline and water.
  • Estimated attenuation at Industrial, Scientific, and Medical (ISM) bands (434 MHz, 915 MHz, 2.45 GHz, 5.8 GHz) met safety and sensitivity requirements.

Conclusions:

  • The 915 MHz and 2.45 GHz bands are recommended for wireless links in biomedical telemetry due to component size advantages.
  • The study provides reference attenuation values for an average-sized human body trunk.
  • Attenuation can vary with individual body size and composition, necessitating consideration for specific applications.