Elimination of Second-Harmonics in CMUTs using Square Pulse Excitation

Anders Lei, Søren Elmin Diederichsen, Sebastian Molbech Hansen, Matthias Bo Stuart, Jan Peter Bagge, Jørgen Arendt Jensen, Erik Vilain Thomsen

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Abstract

The harmonic imaging mode is today a fundamental part of ultrasound imaging; it is not only used for suppressing the grating lobe artifact, but also to reduce many other acoustical artifacts in the ultrasound image. A vital performance parameter for accepting CMUT probes as a clinical usable transducer technology is, that it can support harmonic imaging. The large bandwidth of the CMUT is a clear advantage for harmonic imaging, but the inherent nonlinear behavior of the CMUT poses an issue as it is difficult to dissociate the harmonics generated in the tissue from the harmonic content of the transmitted signal. This work presents how proper pulse coding of a bipolar pulser, which is present in most commercial ultrasound scanners, can reduce the intrinsic generated harmonic to fundamental pressure amplitude ratio to below −35 dB, making CMUT probes usable for clinical applications.
Original languageEnglish
Title of host publicationProceedings of 2016 IEEE International Ultrasonics Symposium
Number of pages4
PublisherIEEE
Publication date2016
ISBN (Print)978-1-4673-9898-5
ISBN (Electronic)978-1-4673-9897-8
DOIs
Publication statusPublished - 2016
Event2016 IEEE International Ultrasonics Symposium - Convention Center Vinci Tours, Tours, France
Duration: 18 Sep 201621 Sep 2016

Conference

Conference2016 IEEE International Ultrasonics Symposium
LocationConvention Center Vinci Tours
CountryFrance
CityTours
Period18/09/201621/09/2016

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