Title :
Valuation of responses in spectral techniques for thermal estimation into biological media, from ultrasonic echo-signals contaminated with increasing noise levels
Author :
Bazán, I. ; Ramos, A. ; Ramirez, A. ; Castellanos, L. ; Posadas, R.
Author_Institution :
Res. & Postgrade Dept., Inst. Tecnol. de Orizaba, Veracruz, Mexico
Abstract :
The objective of this work is to define the preliminary bases needed for achieving an evaluation of responses of the spectral analysis technique for non invasive temperature estimation, when applied to multi-echo ultrasonic signals contaminated with increasing noise levels. Power Spectral Density (PSD) of an ultrasonic signal is calculated in order to obtain accurate information about signal frequency components. The frequency of interest in non invasive thermal estimation is the one associated to the average distance among internal scatterers, which defines a fundamental resonance mode. This fundamental frequency is also associated with the speed of the ultrasound in the propagation media and with its variations versus the temperature. The final objective of this on-going study is to determine potential disturbances on that fundamental resonance frequency, and mainly on its harmonics related to the indirect detection of temperature increments or decrements, for the realistic case of be working with ultrasonic echo-signals contaminated with different noise levels.
Keywords :
acoustic noise; acoustic signal processing; biomedical ultrasonics; biothermics; medical signal processing; spectral analysis; temperature measurement; fundamental resonance mode; noise levels; power spectral density; spectral analysis; thermal estimation; ultrasonic echo-signals; Cost accounting; Couplings; Decision support systems; Medical services; Noise level; noise level; non invasive temperature estimation; spectral analysis; ultrasonic echo-signal;
Conference_Titel :
Health Care Exchange (PAHCE), 2010 Pan American
Conference_Location :
Lima
Print_ISBN :
978-1-4244-6291-9
DOI :
10.1109/PAHCE.2010.5474581