Measure of the temperature-depth profile by an S band radiometric receiver for biomedical applications

The authors present a method for measuring the temperature-depth profile in a lossy material by applying Kalman algorithm to radiometric signals. The method employs a correlation microwave radiometer. It uses both short-range weighting functions and the delay times of the correlator. An experimental verification of this new thermal inversion approach is presented. The thermal noise is received in the microwave domain, by a S band radiometer by using an automatic experimental bench. A feature of this method is that it can be used in biomedical applications.RésuméLes auteurs présentent une méthode de mesure de la température en profondeur dans un milieu dissipatif par application de l’algorithme de Kalman aux signaux radiométriques. Cette méthode emploie un radiomètre micro-onde à corrélation. Elle utilise des fonctions de couplage qui caractérisent le couplage entre un milieu dissipatif et une antenne, et le temps de retard du corrélateur. Une vérification expérimentale de cette nouvelle approche d’inversion thermique est présentée. Le signal de bruit thermique est traité à l’aide d’un radiomètre à bande S, en utilisant un banc expérimental automatisé. Cette méthode est destinée, en particulier, à des applications biomédicales.

[1]  Piero Tognolatti,et al.  Temperature Reconstructions in a Dielectric Cylinder by Multi-Frequency Microwave Radiometry , 1993 .

[2]  Y. Leroy,et al.  Thermometry on lossy coplanar lines by microwave correlation radiometry , 1996 .

[3]  E. J. Blum,et al.  Sensibilité des radiotélescopes et récepteurs à corrélation , 1959 .

[4]  Ahmed Mamouni,et al.  Microwave radiometric imaging at 3 GHz for the exploration of breast tumors , 1990 .

[5]  J. Citerne,et al.  Scattering of the TE/sub 01/ and TM/sub 01/ Modes on Transverse Discontinuities in a Rod Dielectric Waveguide-Application to the Dielectric Resonators , 1981 .

[6]  Y. Leroy,et al.  Deconvolution and Weiner filtering of short-range radiometric images , 1993 .

[7]  Karen Kafadar,et al.  Gaussian white-noise generation for digital signal synthesis , 1986, IEEE Transactions on Instrumentation and Measurement.

[8]  B. Bocquet,et al.  Non-invasive microwave radiometry thermometry , 1998, Physiological measurement.

[9]  D. Land,et al.  A quick accurate method for measuring the microwave dielectric properties of small tissue samples. , 1992, Physics in medicine and biology.

[10]  D. Land,et al.  Dielectric properties of female human breast tissue measured in vitro at 3.2 GHz. , 1992, Physics in medicine and biology.

[11]  Ph. Gelin,et al.  Computation of near-field microwave radiometric signals: definition and experimental verification , 1991 .

[12]  Toshifumi Sugiura,et al.  Retrieval of temperature-depth profiles in biological objects from multi-frequency microwave radiometric data , 1993 .