Accurate prediction of transmission through a lensed row-column addressed array

Sigrid H. Øygard*, Mélanie Audoin, Andreas Austeng, Erik V. Thomsen, Matthias B. Stuart, Jørgen A. Jensen

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Using a diverging lens on a row-column array (RCA) can increase the size of its volumetric image and thus significantly improve its clinical value. Here, a ray tracing method is presented to predict the position of the transmitted wave so that it can be used to make beamformed images. The usable transmitted field-of-view (FOV) is evaluated for a lensed 128 + 128 element RCA by comparing the theoretic prediction of the emitted wavefront position with three-dimensional (3D) finite element simulation of the emitted field. The FOV of the array is found to be 122 °  ±  2 ° in the direction orthogonal to the emitting elements and 28.5°–51.2°, depending on depth and element position, for the direction lying along the element. Moreover, the proposed ray tracing method is compared with a simpler thin lens model, and it is shown that the improved accuracy of the proposed method can increase the usable transmitted FOV up to 25.1°.
Original languageEnglish
JournalJournal of the Acoustical Society of America
Volume151
Issue number5
Pages (from-to)3207-3218
ISSN0001-4966
DOIs
Publication statusPublished - 2022

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