Ultrasonic signal processing for in vivo attenuation measurement: short time Fourier analysis.
Ultrason Imaging
; 5(2): 117-35, 1983 Apr.
Article
em En
| MEDLINE
| ID: mdl-6683891
ABSTRACT
Short-time Fourier analysis is well suited for processing tissue echographic signals which are nonstationary. We have investigated the use of short-time Fourier analysis to provide an estimation of the echographic spectral composition as a function of time. It will be shown that the time dependence of the spectral centroid of this representation allows one to deduce easily the frequency-dependent attenuation. A simple correction of the noninvariant filtering effect due to diffraction is used to unbias the attenuation slope estimation. This new signal processing technique was first tested on simulated echographic data from a 1-D tissue model. Experimental results obtained from echo signals on a tissue-like phantom and on in vivo liver tissue show the influence of diffraction and attenuation respectively.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Ultrassonografia
Tipo de estudo:
Diagnostic_studies
/
Prognostic_studies
Limite:
Animals
/
Humans
Idioma:
En
Revista:
Ultrason Imaging
Ano de publicação:
1983
Tipo de documento:
Article