A simple method to reduce aliasing artifacts in color flow mode imaging.

Jesper Udesen, Svetoslav Nikolov, Jørgen Arendt Jensen

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

Abstract

It is a well known limitation in conventional blood velocity estimation using a phase estimation approach, that aliasing artifacts are present, when the blood velocities exceed a value determined by half the pulse repetition frequency (the Nyquist frequency). This paper proposes a simple anti-aliasing discriminator (AAD) method based on using two different pulse repetition frequencies to increase the aliasing limit to twice the Nyquist frequency. The method is evaluated in simulations using the Field II program. The axial velocity in a virtual blood vessel is found along one axial line, where N=10 emissions are used for each velocity estimate. Mean standard deviation and mean absolute bias are 4.9% and 23.8%, respectively, when no attempt is done to suppress the aliasing. When the AAD is used the corresponding values are 3.4% and 1.0%. When median filtering is applied, the values are 1.1% and 0.6%. The method is evaluated experimentally using the ultrasound scanner RASMUS and a circulating flowrig with parabolic flow. The mean standard deviation and mean absolute bias are 4.0% and 20.3%, respectively, when no attempt is done to suppress the aliasing. When the anti-aliasing discriminator is used the corresponding values are 3.6% and 1.2%. The values are 1.0% and 0.8%, when median filtering is performed.
Original languageEnglish
Title of host publicationIEEE Ultrasonics Symposium 2005
PublisherIEEE
Publication date2005
Pages1352-1355
Publication statusPublished - 2005
Event2005 IEEE Ultrasonics Symposium - Rotterdam, Netherlands
Duration: 18 Sep 200521 Sep 2005
http://ieeexplore.ieee.org/xpl/mostRecentIssue.jsp?punumber=10674

Conference

Conference2005 IEEE Ultrasonics Symposium
Country/TerritoryNetherlands
CityRotterdam
Period18/09/200521/09/2005
Internet address

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