title: Investigation of in-body path loss in different human subjects for localization of capsule endoscope.
abstract: Recent developments in capsule endoscopy have highlighted the need for accurate techniques to estimate the location of a capsule endoscope. A highly accurate location estimation of a capsule endoscope in the gastrointestinal (GI) tract in the range of several millimeters is a challenging task. This is mainly because the radio-frequency signals encounter high loss and a highly dynamic channel propagation environment. Therefore, an accurate path-loss model is required for the development of accurate localization algorithms. This paper presents an in-body path-loss model for the human abdomen region at 2.4 GHz frequency. To develop the path-loss model, electromagnetic simulations using the Finite-Difference Time-Domain (FDTD) method were carried out on two different anatomical human models. A mathematical expression for the path-loss model was proposed based on analysis of the measured loss at different capsule locations inside the small intestine. The proposed path-loss model is a good approximation to model in-body RF propagation, since the real measurements are quite infeasible for the capsule endoscopy subject.
authors.forename: Perzila
authors.initials: P
authors.lastname: Ara
authors.forename: Shaokoon
authors.initials: S
authors.lastname: Cheng
authors.forename: Michael
authors.initials: M
authors.lastname: Heimlich
authors.forename: Eryk
authors.initials: E
authors.lastname: Dutkiewicz
mesh_terms: D000328:Adult; D000465:Algorithms; D053705:Capsule Endoscopes; D005260:Female; D006801:Humans; D007421:Intestine, Small; D008297:Male; D008954:Models, Biological; D011846:Radio Waves