| Autor: |
Øygard, Sigrid H., Audoin, Mélanie, Austeng, Andreas, Thomsen, Erik V., Stuart, Matthias B., Jensen, Jørgen A. |
| Předmět: |
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| Zdroj: |
Journal of the Acoustical Society of America; May2022, Vol. 151 Issue 5, p3207-3218, 12p |
| Abstrakt: |
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°. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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