Multi element synthetic aperture transmission using a frequency division approach

Fredrik Gran, Jørgen Arendt Jensen

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

256 Downloads (Pure)

Abstract

In synthetic aperture imaging an image is created by a number of single element defocused emissions. A low resolution image is created after every emission and a high resolution image is formed when the entire aperture has been covered. Since only one element is used at a time the energy transmitted into the tissue is low. This paper describes a novel method in which the available spectrum is divided into 2N overlapping subbands. This will assure a smooth broadband high resolution spectrum when combined. The signals are grouped into two subsets in which all signals are fully orthogonal. The transmitting elements are excited so that N virtual sources are formed. All sources are excited using one subset at a time. The signals can be separated by matched filtration, and the corresponding information is extracted. The individual source information is hence available in every emission and the method can therefore be used for flow imaging, unlike with Hadamard and Golay coding. The frequency division approach increases the SNR by a factor of N2 compared to conventional pulsed synthetic aperture imaging, provided that N transmission centers are used. Simulations and phantom measurements are presented to verify the method.
Original languageEnglish
Title of host publicationIEEE Symposium on Ultrasonics, 2003
Volume2
PublisherIEEE
Publication date2003
Pages1942-1946
ISBN (Print)0-7803-7922-5
DOIs
Publication statusPublished - 2003
Event2003 IEEE Ultrasonics Symposium - Honolulu, HI, United States
Duration: 5 Oct 20038 Oct 2003
http://ieeexplore.ieee.org/xpl/mostRecentIssue.jsp?punumber=9075

Conference

Conference2003 IEEE Ultrasonics Symposium
CountryUnited States
CityHonolulu, HI
Period05/10/200308/10/2003
Internet address

Bibliographical note

Copyright: 2003 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

Fingerprint Dive into the research topics of 'Multi element synthetic aperture transmission using a frequency division approach'. Together they form a unique fingerprint.

Cite this