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

Javier Rosell*, Roberto Casañas, Hermann Scharfetter

*Korrespondierende/r Autor/in für diese Arbeit

Publikation: Beitrag in einer FachzeitschriftArtikel


We evaluated analytically and experimentally the performance of a planar gradiometer as a sensing element in a system for magnetic induction tomography. A system using an excitation coil and a planar gradiometer was compared against a system with two coils. We constructed one excitation coil, two different sensing elements and a high-resolution phase detector. The first sensor was a PCB square spiral coil with seven turns. The second sensor was a PCB planar gradiometer with two opposite square spirals of seven turns, with a distance between centres of 8 cm. Theoretical sensitivity maps were derived from basic equations and compared with experimental data obtained at 150 kHz. The experimental sensitivity maps were obtained measuring the perturbation produced by a brass sphere of 12 mm in empty space. The advantage of using a gradiometer is that it can be adjusted to give a minimum signal for homogeneous objects, while increasing the sensitivity to local perturbations of the conductivity. Results show that a system using a planar gradiometer as detector has less demanding requirements for the electronic system than a system using simple coils.

Seiten (von - bis)121-130
FachzeitschriftPhysiological measurement
PublikationsstatusVeröffentlicht - 14 Mär 2001

ASJC Scopus subject areas

  • !!Biophysics
  • Physiologie
  • !!Biomedical Engineering
  • !!Physiology (medical)

Fields of Expertise

  • Human- & Biotechnology

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