Experimental Study of Convex Coded Synthetic Transmit Aperture Imaging

Kim Gammelmark, Jørgen Arendt Jensen

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

205 Downloads (Pure)


Synthetic transmit aperture imaging is investigated using a convex array transducer. To increase the signal-to-noise ratio, a multi-element subaperture is used to emulate the spherical wave transmission, and the conventional short excitation pulse is replaced by a linear FM signal. The approach is compared to the conventional application of the convex array in commercial scanners. The array used is a commercial 5.5 MHz, 128 element array with 60% bandwidth and λ pitch. For conventional imaging a 64 element transmit aperture is used with a 2 cycle temporally weighted sinusoid as excitation signal. For synthetic aperture imaging an 11 element transmit aperture is used with a 20 μs linear FM signal as excitation. For both methods, 128 elements are used on receive. Measurements are done using our experimental multi-channel ultrasound scanner, RASMUS. Wire phantom measurements show an improvement in lateral resolution of about 30% throughout the image with lower near and far field sidelobe levels. Results from a cyst phantom show big improvements in contrast resolution, and an increase in penetration depth of about 2 cm. In-vivo images of the abdomen of a healthy 27 year old male show slight improvements in image quality, especially in the near field.
Original languageEnglish
Title of host publicationIEEE Ultrasonics Symposium, 2002. Proceedings
Publication date2002
ISBN (Print)0-7803-7582-3
Publication statusPublished - 2002
Event2002 IEEE Ultrasonics Symposium - Munich, Germany
Duration: 8 Oct 200211 Oct 2002


Conference2002 IEEE Ultrasonics Symposium
Internet address

Bibliographical note

Copyright: 2002 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE

Cite this

Gammelmark, K., & Jensen, J. A. (2002). Experimental Study of Convex Coded Synthetic Transmit Aperture Imaging. In IEEE Ultrasonics Symposium, 2002. Proceedings (pp. 1573-1576). IEEE. https://doi.org/10.1109/ULTSYM.2002.1192603