Phase aberration correction for focused ultrasound transmission by refraction compensation

Moein Mozaffarzadeh, Claudio Minonzio, Martin Verweij, Simone Hemm, Verya Daeichin

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    Abstract

    Phase aberration of focused ultrasound by tissue structure causes focus degradation and reduces the quality of B-mode images. Refraction at the boundary between subcutaneous fat and muscle is one of the dominant factors behind such degradation. To correct this, we propose a refraction compensation method in which ultrasound is transmitted and received twice. The boundary shape between different tissues is detected by the first ultrasound transmission. Next, ultrasound rays from probe elements to the target are calculated taking refraction into account. Corrected delay times are calculated from the length of the rays and the sound velocity of the medium. Finally, ultrasound is transmitted a second time using the corrected delay time and a B-mode image is created. We evaluate the correction effect of the proposed method by numerical simulation and experiments with non-compensated and refraction-compensated cases of intensity distribution of the focused ultrasound. Results show that focus degradation is effectively corrected by the proposed method.

    Original languageEnglish
    Title of host publicationIEEE International Ultrasonics Symposium 2019
    EditorsKim Kang
    PublisherIEEE
    Number of pages5
    Volume58
    EditionSG
    DOIs
    Publication statusPublished - 2019

    Publication series

    NameJapanese Journal of Applied Physics
    ISSN (Print)0021-4922

    Bibliographical note

    Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

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