Influence of Intrinsic Impedance on the Phase of Propagation Pulse Through Biologic Tissue

Abstract

The aim of this study is to examine the influence of the variation of the intrinsic impedance on the phase of a Gaussian pulse during propagation through a biological tissue. This paper describes a method for varying the intrinsic impedance while retaining the characteristics of the propagation medium. The propagation medium is considered as the superposition of four semi-infinite layers each characterized by their thickness, their conductivity, and their dielectric constant. These last parameters, on which the intrinsic impedance depends, are functions of the pulsation of the medium. In this work, we will test the continuity of the phase shift of the signal at the level of interfaces of biological layers with respect to that of the starting point as the function of the excitation pulsation. Next, we are going to vary the intrinsic. Next, we examine the influence of the variation of the intrinsic impedance at the interface on the phase shift of the signal at that level. We will adopt the Finite Difference Time Domain (FDTD) method to simulate the propagation of a Gaussian pulse. This method which is validated in previous work showed robustness to obtained signals very close to the reality at the interfaces. For these two tests, we will notice that the variation of intrinsic impedance has no influence on the variation of the phase at the interfaces.

KEYWORDS:

• Bioimpedance
• Biological interactions
• Differential phase shift
• Phase measurement
• Phase shifters

Additional information

Notes on contributors

M. Ketata

M Ketata was born in Sfax, Tunisia, on August 1977. He received the Electrical Engineering Degree from the National Engineering School of Sfax – Tunisia in 2004, the master degree in electronics in 2007. Actually he is member of Team of Micro-Electronics and Medical Electronics Laboratory of Electronics and Technology of Information a “Doctorate on Electrical Engineering” at the same university. Since 2013, he has worked as assistant at Higher Institute of Applied Science and Technology of Kasserine. His main research interests are the techniques for measurement of the physiological parameters of the human body.

A. Loussert

A Loussert was born in Paris (19°) in 1966, he obtained the “Doctorate of Engineer” in physics and mechanics from the University of Toulon and Var in 1994 and the authorization to direct research (HDR) of the University of Brittany Occidental (UBO) in 2014. He is Director of the Acoustic Laboratory “Acoustics and Instrumentation” in the Higher Institute of Electronics and Digital Laboratory (ISEN) in Brest (Brittany) since 2001 and Senior Member of the IEEE since 2009. He is a Professor of Signal Processing and Finite Elements Modeling since 2001. His research is continuing in the field of underwater acoustics, signal processing by new single crystal modeling and characterization procedures via MIMO acoustic communications. Email: [email protected]

M. Dhieb

M Dhieb was born in Sfax, Tunisia, in November 1978. He received the electrical engineering degree from the National Engineering school of Sfax (ENIS) – Tunisia in 2004 and the electronics master diploma from the National Engineering School of Sfax (ENIS) – Tunisia, in 2005. He is an assistant professor in the Higher Institute of Industrial Management of Sfax (ISGIS) at Sfax University. In 2004, he joined the Team of Micro-Electronics and Medical Electronic, Laboratory of Electronics and Technology of Information (LETI), as a research scholar. His research interests are the techniques for measurement without contact of the physiological parameters of the man. Email: [email protected].

M. Lahiani

M Lahiani was born in Sfax, Tunisia, in 1957. He received the electrical engineering degree from the University of Sciences and Techniques of Sfax – Tunisia in 1984 and the Doctorate of Engineer in measurement and instrumentation from University of Bordeaux1, France, in 1986. Since 1988, he has been a professor at Sfax University. He joined the Sfax National School of Engineering in 1990 and he is a professor in the fields of analog electronics and microelectronics. His research interests are design of circuits in medical electronic and integration of microwave circuits of microstrips with screen-printed thick films technology. Email: [email protected]

H. Ghariani

H Ghariani was born in Sfax, Tunisia, in July 1956. He received the electrical engineering degree from the “University of Sciences and Techniques of Sfax – Tunisia” in 1981, the “DEA” degree in 1981 and his “Doctorate of Engineer” in 1983 in measurement and instrumentation from the “University of Bordeaux France”. He joined the National Engineering School of Sfax since 1984. He is a professor in the same school. His research activities have been devoted to several topics: medical electronic; communication systems for medical telemetry, measure and instrumentation. Email: [email protected]