Medizinische Universität Graz Austria/Österreich - Forschungsportal - Medical University of Graz
Gewählte Publikation:
Scharfetter, H; Lackner, HK; Rosell, J.
Magnetic induction tomography: hardware for multi-frequency measurements in biological tissues.
Physiol Meas. 2001; 22(1):131-146
Doi: 10.1088/0967-3334/22/1/317
Web of Science
PubMed
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- Co-Autor*innen der Med Uni Graz
- Lackner Helmut Karl
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- Abstract:
- Magnetic induction tomography (MIT) is a contactless method for mapping the electrical conductivity of tissue. MIT is based on the perturbation of an alternating magnetic field by a conducting object. The perturbation is detected by a voltage change in a receivercoil. At physiologically interesting frequencies (10 kHz-10 MHz) and conductivities (< 2 S m(-1)) the lower limit for the relative voltage change (signal/carrier ratio = SCR) to be resolved is 10(-7)-10(-10). A new MIT hardware has been developed consisting of a coil system with planar gradiometers and a high-resolution phase detector (PD). The gradiometer together with the PD resolves an SCR of 2.5 x 10(-5) (SNR = 20 dB at 150 kHz, acquisition speed: 100 ms). The system operates between 20 and 370 kHz with the possibility of extending the range up to 1 MHz. The feasibility of measuring conductivity spectra in the beta-dispersion range of biological tissues is experimentally demonstrated. An improvement of the resolution towards SCR = 10(-7) with an SNR of > or = 20 dB at frequencies > 100 kHz is possible. On-line spectroscopy of tissue conductivity with low spatial resolution appears feasible, thus enabling applications such as non-invasive monitoring of brain oedema.
- Find related publications in this database (using NLM MeSH Indexing)
- Brain Edema - diagnosis
- Electric Conductivity -
- Equipment Design -
- Humans -
- Magnetics - diagnostic use
- Sensitivity and Specificity -
- Tomography - instrumentation Tomography - statistics and numerical data
- Find related publications in this database (Keywords)
- magnetic induction tomography
- tissue conductivity
- planar gradiometer
- multi-frequency
- brain oedema