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An analysis of the accuracy level in different alternative techniques for the estimation of increasing temporal displacements in ultrasonic echoes acquired from phantoms (physical and computationally simulated) that mimic biological tissues, is carried out. These time displacements of echoes can be produced, for instance, by a controlled induction of a uniform temperature rising. Average displacement...
The ultrasonic attenuation has been estimated by a variety of methods. However, even if the techniques are accurate, the measurement of this parameter is very difficult because it depends on the conditions of the experiment (frequency, temperature, internal structure of the specimen, artifacts, etc.). Attenuation measurements in tri-distilled and degasified water were made by pulse-echo and through-transmission...
An spectral analysis technique, that establishes a linear relation between the temperature changes in a body and the frequency displacement in the overtone peaks being displayed in the power spectral density (PSD) of ultrasonic echo-signal, has been improved and applied by the paper authors to estimate temperature gradients induced inside a biological phantom by means of ultrasonic therapeutic radiation...
This paper reports the first results of the use of wavelet transform to process ultrasound signals used for estimating temperature in a non-invasive way.
This paper presents a noise immunity analysis of time delay estimation (TDE) techniques used on ultrasonic echoes for non invasive temperature estimation. Four methods are analyzed. The methodology consists on corrupting a simulated ultrasonic signal (ideal signal) with white noise and a signal-to-noise ratio of 3 dB and 6 dB. After this, noise immunity analysis is performed for every method. The...
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