Journal
OPTICS LETTERS
Volume 42, Issue 21, Pages 4379-4382Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.42.004379
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- H2020 European Research Council (ERC) [681514-COHERENCE]
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The resolution of photoacoustic imaging deep inside scattering media is limited by the acoustic diffraction limit. In this Letter, taking inspiration from super-resolution imaging techniques developed to beat the optical diffraction limit, we demonstrate that the localization of individual optical absorbers can provide super-resolution photoacoustic imaging well beyond the acoustic diffraction limit. As a proof-of-principle experiment, photoacoustic cross-sectional images of microfluidic channels were obtained with a 15 MHz linear capacitive micromachined ultrasonic transducer array, while absorbing beads were flown through the channels. The localization of individual absorbers allowed us to obtain a super-resolved cross-sectional image of the channels by reconstructing both the channel width and position with an accuracy better than lambda/10. Given the discrete nature of endogenous absorbers such as red blood cells, or that of exogenous particular contrast agents, localization is a promising approach to push the current resolution limits of photoacoustic imaging. (C) 2017 Optical Society of America
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