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Imaging the complex impedance of the thorax
H Griffiths1, H T Leung, R J Williams
1Department of Medical Physics and Bioengineering, University Hospital of Wales, Health Park, Cardiff, UK.
Summary
Respiration-related impedance imaging revealed distinct conductivity changes in the lungs during breathing. These thorax impedance changes may reflect diaphragm and liver movement during respiration.
Area of Science:
- Electrical Impedance Tomography (EIT)
- Respiratory Physiology
Background:
- Complex impedance measurements can detect physiological changes.
- Thoracic electrical impedance changes are linked to respiration.
Purpose of the Study:
- To investigate respiration-related changes in thoracic complex impedance.
- To analyze the spatial distribution of impedance changes during breathing.
Main Methods:
- Obtained complex impedance data on the thorax of three volunteers.
- Analyzed the real and imaginary parts of the impedance image.
Main Results:
- The real part showed lungs as regions of increased conductivity during expiration.
- The imaginary part displayed a central negative region surrounded by a positive peripheral region.
- These patterns suggest diaphragm and liver movement influence thoracic impedance.
Conclusions:
- Respiration significantly alters thoracic complex impedance patterns.
- Observed impedance changes correlate with diaphragmatic and hepatic movements.
- EIT shows potential for monitoring respiratory mechanics.