Propagation, Power Absorption, and Temperature Analysis of UWB Wireless Capsule Endoscopy Devices Operating in the Human Body

Thotahewa, K. M. S.; Redouté, Jean-Michel; Yuce, M. R.

doi:10.1109/TMTT.2015.2482492

Article (Scientific journals)

Propagation, Power Absorption, and Temperature Analysis of UWB Wireless Capsule Endoscopy Devices Operating in the Human Body

Thotahewa, K. M. S.; Redouté, Jean-Michel; Yuce, M. R.

2015 • In IEEE Transactions on Microwave Theory and Techniques, 63 (11), p. 3823-3833

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https://hdl.handle.net/2268/228076

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10.1109/TMTT.2015.2482492

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Keywords :

Impulse-radio ultra-wideband (IR-UWB); Wireless endoscopy; Antennas; Biological radiation effects; Broadband networks; Channel capacity; Electromagnetic field effects; Electromagnetic wave absorption; Endoscopy; Microwave antennas; Tissue; Electromagnetic power absorption; Finite integration technique; Impulse radio ultra-wideband; Propagation characteristics; Relative permittivity; Simulation-based method; Specific absorption rate; Wireless capsule endoscopy; Ultra-wideband (UWB)

Abstract :

[en] With the increasing use of wireless capsule endoscopy (WCE) devices in healthcare, it is of utmost importance to analyze the electromagnetic power absorption and thermal effects caused by in-body propagation of wireless signals from these devices. This paper studies the path loss, specific absorption rate (SAR), specific absorption (SA), and temperature variation of the human body caused by an impulse-radio ultra-wideband (UWB) based WCE operating inside the human abdomen. In addition, the design and in-body performance of an UWB antenna with dimensions of 11.85 × 9 × 1.27 mm and operating from 3.5 to 4.5 GHz is described in this paper. Path loss is evaluated using both experimental and simulation based methods to characterize the in-body propagation channel. The experimental setup uses a pig's abdominal tissue samples to demonstrate the propagation characteristics of human tissue while a voxel model of the human body consisting of human tissue simulating materials is used in the simulations. The tissue properties, such as relative permittivity, are characterized according to the incident signal frequency and age of the tissue sample during simulations. The SAR and SA variations for different positions of the WCE device inside the colon and the small intestine of the human body model are analyzed using the finite integration technique as the discretization model. The dependency of the electromagnetic effects on the antenna positioning is investigated by using different positions of the antenna inside the human body. © 2015 IEEE.

Disciplines :

Electrical & electronics engineering

Author, co-author :

Thotahewa, K. M. S.; Australian Centre for Electromagnetic Bioeffects Research, Swinburne University of Technology, Melbourne, VIC 3000, Australia

Redouté, Jean-Michel ; Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Systèmes microélectroniques intégrés

Yuce, M. R.; School of Electrical and Computer Systems Engineering, Monash University, Melbourne, VIC 3800, Australia

Language :

English

Title :

Propagation, Power Absorption, and Temperature Analysis of UWB Wireless Capsule Endoscopy Devices Operating in the Human Body

Publication date :

2015

Journal title :

IEEE Transactions on Microwave Theory and Techniques

ISSN :

0018-9480

eISSN :

1557-9670

Publisher :

Institute of Electrical and Electronics Engineers Inc.

Volume :

Issue :

Pages :

3823-3833

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 25 September 2018

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