Planar and cylindrical active microwave temperature imaging: numerical simulations

Author

Rius, J.M. ; Pichot, C. ; Jofre, L. ; Bolomey, J.C. ; Joachimowicz, N. ; Broquetas, A. ; Ferrando, M.

Author_Institution

E.T.S.E. Telecommun., Univ. Politecnica de Catalunya, Barcelona, Spain

Volume

11

Issue

4

fYear

1992

fDate

12/1/1992 12:00:00 AM

Firstpage

457

Lastpage

469

Abstract

A comparative study at 2.45 GHz concerning both measurement and reconstruction parameters for planar and cylindrical configurations is presented. For the sake of comparison, a numerical model consisting of two nonconcentric cylinders is considered and reconstructed using both geometries from simulated experimental data. The scattered fields and reconstructed images permit extraction of very useful information about dynamic range, sensitivity, resolution, and quantitative image accuracy for the choice of the configuration in a particular application. Both geometries can measure forward and backward scattered fields. The backscattering measurement improves the image resolution and reconstruction in lossy mediums, but, on the other hand, has several dynamic range difficulties. This tradeoff between forward only and forward-backward field measurement is analyzed. As differential temperature imaging is a weakly scattering problem, Born approximation algorithms can be used. The simplicity of Born reconstruction algorithms and the use of FFT make them very attractive for real-time biomedical imaging systems

Keywords

biothermics; microwave imaging; patient diagnosis; temperature measurement; 2.45 GHz; Born reconstruction algorithms; backscattering measurement; cylindrical active microwave temperature imaging; differential temperature imaging; dynamic range difficulties; forward only field measurement; forward-backward field measurement; image resolution; lossy mediums; nonconcentric cylinders; numerical model; planar active microwave temperature imaging; quantitative image accuracy; real-time biomedical imaging systems; reconstruction parameters; resolution; scattered fields; sensitivity; weakly scattering problem; Biomedical imaging; Biomedical measurements; Dynamic range; Geometry; Image reconstruction; Image resolution; Microwave imaging; Numerical models; Scattering; Temperature;

fLanguage

English

Journal_Title

Medical Imaging, IEEE Transactions on

Publisher

ieee

ISSN

0278-0062

Type

jour

DOI

10.1109/42.192681

Filename

192681