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Acoustic lenses made of acrylic plastic (PMMA) have been used to enlarge theacceptance angle of sensitive large surface area detectors and improve lateralresolution. However, PMMA lenses introduce image artifacts due to ultrasoundinternal reflections within the lenses. In this work we investigated this issueproposing a new lens material Stycast 1090SI. We characterized the acousticproperties of the proposed material in comparison with PMMA. Detectorperformance using negative lenses with the two materials, was tested usingfinite element simulation and experiment. Further the image quality of aphotoacoustic tomography system was studied using k-Wave simulation andexperiment. Our acoustic characterization showed that Stycast 1090SI hastissue-like acoustic impedance, high speed of sound and low acousticattenuation. Both acoustic lenses show significant enlargement of detectoracceptance angle and lateral resolution improvement. However, image artifactsinduced by acoustic lenses are reduced using the proposed lens compared to PMMAlens.

A new acoustic lens material for large area detectors in photoacoustic breast tomography