Title :
A low complexity data-dependent beamformer
Author :
Synnevåg, Johan-Fredrik ; Holm, Sverre ; Austeng, Andreas
Author_Institution :
Dept. of Inf., Univ. of Oslo, Oslo
Abstract :
The classical problem of choosing apodization functions for a beamformer involves a trade-off between mainlobe width and sidelobe level, i.e. a trade-off between resolution and contrast. To avoid this trade-off it has been suggested to apply adaptive methods, such as minimum variance beamforming, to medical ultrasound imaging. This has been an active topic of research in the recent years, and several authors have demonstrated significant improvements in image resolution. However, the improvement comes at a considerable cost. Where the complexity of a conventional beamformer is linear with the number of elements (O(M)), the complexity of the minimum variance beamformer is up to O(M3). In this paper we have applied a method-based on an idea by Vignon and Burcher-which is data-adaptive, but selects the apodization function between a number of predefined windows, giving linear complexity.
Keywords :
array signal processing; biomedical ultrasonics; covariance matrices; image resolution; apodization function; data-dependent beamformer; image resolution; mainlobe width; medical ultrasound imaging; minimum variance beamforming; spatial covariance matrix; Array signal processing; Biomedical imaging; Costs; Delay; Focusing; Image quality; Image resolution; Informatics; Transducers; Ultrasonic imaging;
Conference_Titel :
Ultrasonics Symposium, 2008. IUS 2008. IEEE
Conference_Location :
Beijing
Print_ISBN :
978-1-4244-2428-3
Electronic_ISBN :
978-1-4244-2480-1
DOI :
10.1109/ULTSYM.2008.0261