Author : Meenu Unnikrishnan 1
Date of Publication :7th October 2015
Abstract: Medical electronic technology has developed to a great extend in last few decades. Ultra sound imaging has been one of the greatest gift to medical science technology. In last few decades, ultrasound imaging technology has revolutionized the field of medical science. Adaptive beam-forming method has contributed much to the resolution and contrast of image. In this work, minimum variance (MV) beamforming for broadband data is proposed. We implement it in frequency domain and for each of these frequency sub band a set of complete, adapted apodization weight is provided. The simulation is done in FIELD ll environment. The simulation is done on point targets as well as on cyst phantoms. We aim at showing that the resolution and image clarity in the case of MV beam former is more when compared to the conventional DAS (delay and sum) beam former, even for fewer number of emission. Investigation on different methods for computation of inverse of the covariance matrix has been done. Also in this work we make use of DCD algorithm for computing the apodization weight and also we aim at showing that the DCD algorithm finds the best place compared to the other iterative algorithm for hardware implementation.
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