caa a22 4500 605539693 CHVBK 20210128100908.0 cr unu---uuuuu 210128e20151001xx s 000 0 eng 10.1007/s10396-015-0640-6 doi (NATIONALLICENCE)springer-10.1007/s10396-015-0640-6 Weighted Capon beamformer combined with coded excitation in ultrasound imaging [Elektronische Daten] [Seyed Izadi, Ali Mahloojifar, Babak Asl] Background: Capon-based beamformers are well-known methods to improve the SNR and quality of medical ultrasound images. Furthermore, they can improve the resolution of the images unexpectedly more than conventional DAS beamformers. Another method used in radar, sonar, and ultrasound imaging to increase the SNR is coded excitation with linear frequency-modulated signal (chirp). Method: In this paper, we illustrate that the combination of coded excitation with a Capon beamformer provides better resolution and higher SNR. However, this combination suffers from high sidelobe levels. We propose a weighted Capon beamformer (WCB) with chirp excitation to suppress the sidelobes and obtain a higher contrast with approximately the same resolution as the standard Capon beamformer (SCB). The weights of the WCB are obtained using element-wise multiplication of the weights of the SCB and a desired window (Hanning) with the same dimension. Results: The results show a 20dB reduction in the sidelobe levels in simulated point targets and a 6dB increase in background contrast in simulated cyst phantoms. The Japan Society of Ultrasonics in Medicine, 2015 Capon nationallicence Minimum variance nationallicence Adaptive beamformer nationallicence Coded excitation nationallicence Chirp nationallicence Izadi Seyed Department of Biomedical Engineering, Tarbiat Modares University, Ale-Ahmad Avenue, P.o. Box 14115-194, Tehran, Islamic Republic of Iran aut Mahloojifar Ali Department of Biomedical Engineering, Tarbiat Modares University, Ale-Ahmad Avenue, P.o. Box 14115-194, Tehran, Islamic Republic of Iran aut Asl Babak Department of Biomedical Engineering, Tarbiat Modares University, Ale-Ahmad Avenue, P.o. Box 14115-194, Tehran, Islamic Republic of Iran aut Journal of Medical Ultrasonics Springer Japan 42/4(2015-10-01), 477-488 1346-4523 42:4<477 2015 42 10396 https://doi.org/10.1007/s10396-015-0640-6 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10396-015-0640-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Izadi Seyed Department of Biomedical Engineering, Tarbiat Modares University, Ale-Ahmad Avenue, P.o. Box 14115-194, Tehran, Islamic Republic of Iran aut NATIONALLICENCE 700 1- Mahloojifar Ali Department of Biomedical Engineering, Tarbiat Modares University, Ale-Ahmad Avenue, P.o. Box 14115-194, Tehran, Islamic Republic of Iran aut NATIONALLICENCE 700 1- Asl Babak Department of Biomedical Engineering, Tarbiat Modares University, Ale-Ahmad Avenue, P.o. Box 14115-194, Tehran, Islamic Republic of Iran aut NATIONALLICENCE 773 0- Journal of Medical Ultrasonics Springer Japan 42/4(2015-10-01), 477-488 1346-4523 42:4<477 2015 42 10396