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Determining the Position and Orientation of In-body Medical Instruments Using Near-Field Magnetic Field Mapping

Cavlu, V; Brennan, P; (2019) Determining the Position and Orientation of In-body Medical Instruments Using Near-Field Magnetic Field Mapping. IEEE Journal of Electromagnetics, RF and Microwaves in Medicine and Biology 10.1109/JERM.2019.2914402. (In press). Green open access

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Abstract

There is a increasing demand for localizing medical implants in-body, such as wireless capsule endoscope (WCE) and Nasogastric tube (NGT). Some studies have been conducted to solve this issue using either permanent magnets, static current sources or RF fields. The permanent magnet fails due to low power, and static current source requires relatively high power source. The RF field source requires high frequencies to get enough precision, which undergoes high attenuation in the body. At low frequency, when the distance between the source and the receiver array is shorter than the wavelength, the far field assumption fails for localization methods. Therefore, we propose a novel method of mapping the magnetic field vector in the near field region, with which wavelength independent localization is done. We did extensive MATLAB and CST Microwave simulations followed by practical experiments. The proposed method has achieved localization accuracy of less than 1 cm in Y-Z plane, 2 cm in depth (in X-axis) and the maximum orientation error remained 10° in 3-D.

Type: Article
Title: Determining the Position and Orientation of In-body Medical Instruments Using Near-Field Magnetic Field Mapping
Open access status: An open access version is available from UCL Discovery
DOI: 10.1109/JERM.2019.2914402
Publisher version: https://doi.org/10.1109/JERM.2019.2914402
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Radio frequency, Electromagnetics, Computational modeling, Magnetic flux, Biology, Sensor arrays, Microwave theory and techniques, Nasogastric Tube (NGT), Wireless Capsule Endoscope (WCE), Magnetic Field Mapping (MFM), Near Field, Source Plane (SP), Local Maxima (x1 and x2), In-body Medical Instruments (IBMI)
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10073195
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