ABSTRACT
This chapter introduces the dielectric properties of human tissue in detail. In addition, it discusses the microwave penetration performance at different frequencies. The chapter also introduces forward solvers, and different medical radar techniques in two major categories. The first discusses inverse scattering algorithms, including Gauss–Newton type methods, contrast source method, and distorted Born iterative method (DBIM). Inverse scattering methods for imaging are based on the estimation of the profile of the internal dielectric properties of human tissue, usually relative permittivity and conductivity, from the data collected outside human body. These types of problems are different from conventional direct problems. In direct problems, the electromagnetic (EM) properties and parameters of objects are known, and the scattered field is the output of the system. The second describes reconstruction algorithms used in UWB radar imaging. The chapter lists and discusses applications where medical radar techniques are primarily employed. Finally, it discusses challenges and some future research directions.
