Diverging Polymer Lens Design and Fabrication for Row-Column Addressed Transducers

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Abstract

Double-curved diverging lenses mounted on flat 2D Row-Column Addressed (RCA) transducers have shown the potential to extend the Field of View (FOV) from a rectilinear to a curvilinear volume region and thereby enable real-time 3D imaging of large organs. Such lenses are usually made of off-the-shelf pieces of materials, which leaves no room for optimization. In this work, acoustic lenses have been fabricated in a fast, inexpensive and flexible manner using a combination of 3D printing and casting or CNC machining techniques. The lenses are made either in a concave or convex double-curved shape and from thermoplastics and thermosetting polymers. PMMA (Polymethyl methacrylate), PP (Polypropylene), RTV (Room-temperature-vulcanizing silicone) and PDMS (Polydimethylsiloxane) diverging lenses have been fabricated and mounted on a 128+128 6 MHz Row-Column Vermon transducer. The -3 dB FOV of each lensed array has been measured and results in a maximum of 16° for a 43 mm radius PMMA lens. This work shows that thermoplastics are suitable material for fabricating low-attenuation convex or flat compound diverging lenses for 2D transducers. These lenses are highly desired for achieving volumetric anatomical imaging of large organs.
Original languageEnglish
Title of host publicationProceedings of 2022 IEEE International Ultrasonics Symposium (IUS)
Number of pages4
PublisherIEEE
Publication date2022
ISBN (Print)978-1-6654-7813-7
ISBN (Electronic)978-1-6654-6657-8
DOIs
Publication statusPublished - 2022
Event2022 IEEE International Ultrasonics Symposium - Venice, Italy
Duration: 10 Oct 202213 Oct 2022

Conference

Conference2022 IEEE International Ultrasonics Symposium
Country/TerritoryItaly
CityVenice
Period10/10/202213/10/2022

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