In vivo and In situ Measurement and Modeling of Intra-Body Effective Complex Permittivity

Esmaeil S. Nadimi, Victoria Blanes-Vidal, Jakob le Fèvre Harslund, Mohammad Hossein Ramezani, Jens Kjeldsen, Per Michael Johansen, David Thiel, Vahid Tarokh

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Radio frequency tracking of medical micro-robots in minimally invasive medicine is usually investigated upon the assumption that the human body is a homogeneous propagation medium. In this Letter, the authors conducted various trial programs to measure and model the effective complex permittivity e in terms of refraction e', absorption e and their variations in gastrointestinal (GI) tract organs (i.e. oesophagus, stomach, small intestine and large intestine) and the porcine abdominal wall under in vivo and in situ conditions. They further investigated the effects of irregular and unsynchronised contractions and simulated peristaltic movements of the GI tract organs inside the abdominal cavity and in the presence of the abdominal wall on the measurements and variations of e' and e. They advanced the previous models of effective complex permittivity of a multilayer inhomogeneous medium, by estimating an analytical model that accounts for reflections between the layers and calculates the attenuation that the wave encounters as it traverses the GI tract and the abdominal wall. They observed that deviation from the specified nominal layer thicknesses due to non-geometric boundaries of GI tract morphometric variables has an impact on the performance of the authors' model. Therefore, they derived statistical-based models for ' and using their experimental measurements.
Original languageEnglish
JournalHealthcare Technology Letters
Volume2
Issue number6
Pages (from-to)135-140
ISSN2053-3713
DOIs
Publication statusPublished - 2015

Cite this

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title = "In vivo and In situ Measurement and Modeling of Intra-Body Effective Complex Permittivity",
abstract = "Radio frequency tracking of medical micro-robots in minimally invasive medicine is usually investigated upon the assumption that the human body is a homogeneous propagation medium. In this Letter, the authors conducted various trial programs to measure and model the effective complex permittivity e in terms of refraction e', absorption e and their variations in gastrointestinal (GI) tract organs (i.e. oesophagus, stomach, small intestine and large intestine) and the porcine abdominal wall under in vivo and in situ conditions. They further investigated the effects of irregular and unsynchronised contractions and simulated peristaltic movements of the GI tract organs inside the abdominal cavity and in the presence of the abdominal wall on the measurements and variations of e' and e. They advanced the previous models of effective complex permittivity of a multilayer inhomogeneous medium, by estimating an analytical model that accounts for reflections between the layers and calculates the attenuation that the wave encounters as it traverses the GI tract and the abdominal wall. They observed that deviation from the specified nominal layer thicknesses due to non-geometric boundaries of GI tract morphometric variables has an impact on the performance of the authors' model. Therefore, they derived statistical-based models for ' and using their experimental measurements.",
keywords = "abdominal wall art attenuation disease simulation esophagus gastrointestinal tract human large intestine *model muscle contractility organ peritoneal cavity pig robotics small intestine statistical model stomach",
author = "{S. Nadimi}, Esmaeil and Victoria Blanes-Vidal and Harslund, {Jakob le F{\`e}vre} and Ramezani, {Mohammad Hossein} and Jens Kjeldsen and Johansen, {Per Michael} and David Thiel and Vahid Tarokh",
year = "2015",
doi = "10.1049/htl.2015.0024",
language = "English",
volume = "2",
pages = "135--140",
journal = "Healthcare Technology Letters",
issn = "2053-3713",
publisher = "Institution of Engineering and Technology",
number = "6",

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In vivo and In situ Measurement and Modeling of Intra-Body Effective Complex Permittivity. / S. Nadimi, Esmaeil; Blanes-Vidal, Victoria ; Harslund, Jakob le Fèvre; Ramezani, Mohammad Hossein; Kjeldsen, Jens; Johansen, Per Michael; Thiel, David; Tarokh, Vahid.

In: Healthcare Technology Letters, Vol. 2, No. 6, 2015, p. 135-140.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - In vivo and In situ Measurement and Modeling of Intra-Body Effective Complex Permittivity

AU - S. Nadimi, Esmaeil

AU - Blanes-Vidal, Victoria

AU - Harslund, Jakob le Fèvre

AU - Ramezani, Mohammad Hossein

AU - Kjeldsen, Jens

AU - Johansen, Per Michael

AU - Thiel, David

AU - Tarokh, Vahid

PY - 2015

Y1 - 2015

N2 - Radio frequency tracking of medical micro-robots in minimally invasive medicine is usually investigated upon the assumption that the human body is a homogeneous propagation medium. In this Letter, the authors conducted various trial programs to measure and model the effective complex permittivity e in terms of refraction e', absorption e and their variations in gastrointestinal (GI) tract organs (i.e. oesophagus, stomach, small intestine and large intestine) and the porcine abdominal wall under in vivo and in situ conditions. They further investigated the effects of irregular and unsynchronised contractions and simulated peristaltic movements of the GI tract organs inside the abdominal cavity and in the presence of the abdominal wall on the measurements and variations of e' and e. They advanced the previous models of effective complex permittivity of a multilayer inhomogeneous medium, by estimating an analytical model that accounts for reflections between the layers and calculates the attenuation that the wave encounters as it traverses the GI tract and the abdominal wall. They observed that deviation from the specified nominal layer thicknesses due to non-geometric boundaries of GI tract morphometric variables has an impact on the performance of the authors' model. Therefore, they derived statistical-based models for ' and using their experimental measurements.

AB - Radio frequency tracking of medical micro-robots in minimally invasive medicine is usually investigated upon the assumption that the human body is a homogeneous propagation medium. In this Letter, the authors conducted various trial programs to measure and model the effective complex permittivity e in terms of refraction e', absorption e and their variations in gastrointestinal (GI) tract organs (i.e. oesophagus, stomach, small intestine and large intestine) and the porcine abdominal wall under in vivo and in situ conditions. They further investigated the effects of irregular and unsynchronised contractions and simulated peristaltic movements of the GI tract organs inside the abdominal cavity and in the presence of the abdominal wall on the measurements and variations of e' and e. They advanced the previous models of effective complex permittivity of a multilayer inhomogeneous medium, by estimating an analytical model that accounts for reflections between the layers and calculates the attenuation that the wave encounters as it traverses the GI tract and the abdominal wall. They observed that deviation from the specified nominal layer thicknesses due to non-geometric boundaries of GI tract morphometric variables has an impact on the performance of the authors' model. Therefore, they derived statistical-based models for ' and using their experimental measurements.

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