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Sensitivity maps and system requirements for magnetic induction tomography using a planar gradiometer.

J Rosell1, R Casañas, H Scharfetter

  • 1Departament d'Enginyeria Electrònica, Universitat Politènica de Catalunya, Barcelona, Spain. jrosell@eel.upc.es

Physiological Measurement
|March 10, 2001
PubMed
Summary

A planar gradiometer enhances magnetic induction tomography systems by improving sensitivity to conductivity changes. This sensor offers a simpler electronic system compared to traditional coil-based detectors.

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Area of Science:

  • Electrical Engineering
  • Biomedical Imaging
  • Applied Physics

Background:

  • Magnetic induction tomography (MIT) systems require sensitive detection elements for accurate imaging.
  • Traditional MIT systems often use simple coils, which can have limitations in sensitivity and electronic requirements.

Purpose of the Study:

  • To evaluate the performance of a planar gradiometer as a sensing element in magnetic induction tomography.
  • To compare the performance of a planar gradiometer-based system with a system using simple coils.

Main Methods:

  • Analytical and experimental evaluation of a planar gradiometer and a PCB square spiral coil.
  • Construction of an excitation coil, two sensing elements, and a high-resolution phase detector.
  • Derivation of theoretical sensitivity maps and comparison with experimental data at 150 kHz, using a brass sphere perturbation.

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Main Results:

  • The planar gradiometer system demonstrated less demanding electronic requirements compared to a simple coil system.
  • The gradiometer can be adjusted to minimize signals from homogeneous objects, enhancing sensitivity to local conductivity perturbations.
  • Experimental sensitivity maps validated theoretical predictions.

Conclusions:

  • A planar gradiometer is a viable and advantageous sensing element for magnetic induction tomography.
  • The use of a planar gradiometer simplifies system electronics and improves sensitivity to conductivity variations.