Reverberation Reduction Using 3D Wiener Filtering
2003 (English)Conference paper (Other academic)
One of the most common artifacts in ultrasound imaging is reverberations. These are multiple reflection echoes that register as coming from a deeper region than the depth of the interface that are causing them, and result in ghost echoes in the ultrasound image. A method to reduce these unwanted artifacts using a three dimensional (2D + time) Wiener filter has been developed. Two sequences of iq-data, the least processed signal possible to retrieve from the ultrasound system (Vingmed System Five), have been used to test the method: One sequence on a tissue-mimicking agar gel phantom in which bars of glass simulating ribs give rise to reverberations, and one sequence on an open-chest pig with a strong reverberation from a water-filled rubber glove used as a medium between the heart and the transducer. The procedure works as follows: In a graphic interface the operator is shown the image sequence. In one of the frames two areas must be marked out; One area which contains a typical reverberation artifact, and one area which will represent an artifact free signal. After creating the three dimensional Wiener filter post-processing of the sequence is performed. The developed method significantly reduced the magnitude of the reverberation artifact in the tested sequences.
Place, publisher, year, edition, pages
National CategoryBiomedical Laboratory Science/Technology
IdentifiersURN: urn:nbn:se:liu:diva-61164OAI: oai:DiVA.org:liu-61164DiVA: diva2:360815
SSBA 2003 Symposium on Image Analysis, Stockholm, Sweden, 6-7 mars 2003