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Residual capacitive coupling and the measurement of permittivity in magnetic induction tomography
H Griffiths1, W Gough, S Watson
1Department of Medical Physics & Clinical Engineering, Swansea NHS Trust, Singleton Hospital, Swansea SA2 8QA, and Department of Physics & Astronomy, Cardiff University, UK. huw.griffiths@swansea-tr.wales.nhs.uk
Abstract:
In an ideal magnetic induction tomography (MIT) system, the coupling between the coils and the sample is entirely by the magnetic field. In a practical system, unwanted electric-field (capacitive) coupling can also exist and cause large errors in the MIT measurements unless the hardware is designed carefully. A series of tests was carried out to assess the magnitude of capacitive coupling present in a 10 MHz MIT system designed for biomedical use and other applications involving low-conductivity samples (
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