Adaptive Receive and Transmit Apodization for Synthetic Aperture Ultrasound Imaging

Iben Kraglund Holfort, Andreas Austeng, Johan-Fredrik Synnevåg, Sverre Holm, Fredrik Gran, Jørgen Arendt Jensen

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This paper suggests a framework for utilizing adaptive, data-dependent apodization weights on both the receiving and transmitting aperture for Synthetic Aperture (SA) ultrasound imaging. The suggested approach is based on the Minimum Variance (MV) beamformer and consists of two steps. A set of uniquely designed receive apodization weights are applied to pre-summed element data forming a set of adaptively weighted images; these are in SA literature conventionally referred to as low-resolution images. The adaptive transmit apodization is obtained by applying MV across the full set of single emission images before summation. The method is investigated using simulated SA ultrasound data obtained using Field II. Data of 13 point targets distributed at depths from 40 mm to 70 mm, and a 5.5 MHz, 64-element linear array transducer have been used. The investigation has shown that the introduction of adaptive apodization weights on the transmitting aperture provides a main-lobe reduction (estimated at -30 dB) by a factor of 1.8 compared to the method using adaptive apodization weights on the receiving aperture only.
Original languageEnglish
Title of host publication2009 IEEE International Ultrasonics Symposium (IUS)
Number of pages4
Publication date2009
ISBN (Print)978-1-4244-4389-5
Publication statusPublished - 2009
Event2009 IEEE International Ultrasonics Symposium - Ergife Palace Hotel, Rome, Italy
Duration: 20 Sep 200923 Sep 2009


Conference2009 IEEE International Ultrasonics Symposium
LocationErgife Palace Hotel
Internet address

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