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In this Letter, the authors conducted various trial programs to measure and model the effective complex permittivity \u03b5 in terms of refraction \u03b5\u2032, absorption \u03b5\u2033 and their variations in gastrointestinal (GI) tract organs (i.e. oesophagus, stomach, small intestine and large intestine) and the porcine abdominal wall under\n                    <jats:italic>in vivo<\/jats:italic>\n                    and\n                    <jats:italic>in situ<\/jats:italic>\n                    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 \u03b5\u2032 and \u03b5\u2032\u2032. 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\u2010geometric boundaries of GI tract morphometric variables has an impact on the performance of the authors\u2019 model. Therefore, they derived statistical\u2010based models for \u03b5\u2032 and \u03b5\u2032\u2032 using their experimental measurements.\n                  <\/jats:p>","DOI":"10.1049\/htl.2015.0024","type":"journal-article","created":{"date-parts":[[2015,9,30]],"date-time":"2015-09-30T06:11:18Z","timestamp":1443593478000},"page":"135-140","source":"Crossref","is-referenced-by-count":8,"title":["<i>In vivo<\/i>\n                    and\n                    <i>in situ<\/i>\n                    measurement and modelling of intra\u2010body effective complex permittivity"],"prefix":"10.1049","volume":"2","author":[{"given":"Esmaeil S.","family":"Nadimi","sequence":"first","affiliation":[{"name":"Applied Statistical Signal Processing Group (\u03c0SeG), Faculty of Engineering Maersk Mc\u2010Kinney Moller Institute, University of Southern Denmark  Denmark"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Victoria","family":"Blanes\u2010Vidal","sequence":"additional","affiliation":[{"name":"Department of Chemical Engineering, Biotechnology and Environmental Technology University of Southern Denmark  Denmark"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jakob L.F.","family":"Harslund","sequence":"additional","affiliation":[{"name":"Biomedical Laboratory Institute of Molecular Medicine, Odense University Hospital  Denmark"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mohammad H.","family":"Ramezani","sequence":"additional","affiliation":[{"name":"Applied Statistical Signal Processing Group (\u03c0SeG), Faculty of Engineering Maersk Mc\u2010Kinney Moller Institute, University of Southern Denmark  Denmark"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jens","family":"Kjeldsen","sequence":"additional","affiliation":[{"name":"Department for Gastroenterology Institute of Clinical Research, Odense University Hospital  Denmark"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Per Michael","family":"Johansen","sequence":"additional","affiliation":[{"name":"Aalborg University  Denmark"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"David","family":"Thiel","sequence":"additional","affiliation":[{"name":"Center for Wireless Monitoring and Applications, School of Engineering Griffith University  Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Vahid","family":"Tarokh","sequence":"additional","affiliation":[{"name":"School of Engineering and Applied Sciences Harvard University  USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"265","published-online":{"date-parts":[[2015,11,30]]},"reference":[{"key":"e_1_2_8_2_1","unstructured":"Sayrafian\u2010Pour K. 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