IEEE Trans Image Process - MIMO nonlinear ultrasonic tomography by propagation and backpropagation method.

Tópicos

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Resumo

This paper develops a fast ultrasonic tomographic imaging method in a multiple-input multiple-output (MIMO) configuration using the propagation and backpropagation (PBP) method. By this method, ultrasonic excitation signals from multiple sources are transmitted simultaneously to probe the objects immersed in the medium. The scattering signals are recorded by multiple receivers. Utilizing the nonlinear ultrasonic wave propagation equation and the received time domain scattered signals, the objects are to be reconstructed iteratively in three steps. First, the propagation step calculates the predicted acoustic potential data at the receivers using an initial guess. Second, the difference signal between the predicted value and the measured data is calculated. Third, the backpropagation step computes updated acoustical potential data by backpropagating the difference signal to the same medium computationally. Unlike the conventional PBP method for tomographic imaging where each source takes turns to excite the acoustical field until all the sources are used, the developed MIMO-PBP method achieves faster image reconstruction by utilizing multiple source simultaneous excitation. Furthermore, we develop an orthogonal waveform signaling method using a waveform delay scheme to reduce the impact of speckle patterns in the reconstructed images. By numerical experiments we demonstrate that the proposed MIMO-PBP tomographic imaging method results in faster convergence and achieves superior imaging quality.

Resumo Limpo

paper develop fast ultrason tomograph imag method multipleinput multipleoutput mimo configur use propag backpropag pbp method method ultrason excit signal multipl sourc transmit simultan probe object immers medium scatter signal record multipl receiv util nonlinear ultrason wave propag equat receiv time domain scatter signal object reconstruct iter three step first propag step calcul predict acoust potenti data receiv use initi guess second differ signal predict valu measur data calcul third backpropag step comput updat acoust potenti data backpropag differ signal medium comput unlik convent pbp method tomograph imag sourc take turn excit acoust field sourc use develop mimopbp method achiev faster imag reconstruct util multipl sourc simultan excit furthermor develop orthogon waveform signal method use waveform delay scheme reduc impact speckl pattern reconstruct imag numer experi demonstr propos mimopbp tomograph imag method result faster converg achiev superior imag qualiti

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