Reconstruction of the shape of conductivity spectra using differential multi-frequency magnetic induction tomography

Physiological Measurement
Patricia BrunnerHermann Scharfetter

Abstract

Magnetic induction tomography (MIT) of biological tissue is used for the reconstruction of the complex conductivity distribution kappa inside the object under investigation. It is based on the perturbation of an alternating magnetic field caused by the object and can be used in all applications of electrical impedance tomography (EIT) such as functional lung monitoring and assessment of tissue fluids. In contrast to EIT, MIT does not require electrodes and magnetic fields can also penetrate non-conducting barriers such as the skull. As in EIT, the reconstruction of absolute conductivity values is very difficult because of the method's sensitivity to numerical errors and noise. To overcome this problem, image reconstruction in EIT is often done differentially. Analogously, this concept has been adopted for MIT. Two different methods for differential imaging are applicable. The first one is state-differential, for example when the conductivity change between inspiration and expiration in the lung regions is being detected. The second one is frequency-differential, which is of high interest in motionless organs like the brain, where a state-differential method cannot be applied. An equation for frequency-differential MIT was deriv...Continue Reading

References

Jun 19, 2003·Physiological Measurement·Robert MerwaHermann Scharfetter
Jul 10, 2003·IEEE Transactions on Bio-medical Engineering·Hermann ScharfetterJavier Rosell
Mar 31, 2005·Physiological Measurement·Robert MerwaHermann Scharfetter
Mar 31, 2005·Physiological Measurement·Hermann ScharfetterKarl Pilz

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Citations

Feb 11, 2009·IEEE Transactions on Bio-medical Engineering·Doga Gürsoy, Hermann Scharfetter
May 8, 2018·Scientific Reports·Lu Ma, Manuchehr Soleimani

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