Multigate doppler signal analysis using 3-D regularized long AR modelling. |
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Authors: | C Berthomier A Herment J F Giovannelli G Guidi L Pourcelot B Diebold |
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Institution: | U494 INSERM, CHU Pitié-Salpêtrière, 91 Bld de l'H?pital, Paris, France. bertho@imed.jussieu.fr |
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Abstract: | Autoregressive (AR) modelling has already been proposed as an alternative to fast Fourier transform to process ultrasound (US) Doppler signals. Previous works introduced long AR models, set up under a regularization framework. The latter may be in 1-D (frequency) or 2-D (frequency and space or time). This study generalizes the spectrum regularization in the three dimensions frequency, space and time. The problem of the penalization function is addressed, and a new convex solution is proposed, taking into account possible nonstationarity of the Doppler signal. The parameter tuning is based on simulations using a standard Doppler signal model. The first results show that this processing improves the spectral estimation, and is well suited to flow interpretation. |
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