Image reconstruction of multi-channel photoacoustic and laser-ultrasound data using reverse-time migration

J.L. Johnson, Jeffrey Shragge, K. Van Wijk

    Research output: Chapter in Book/Conference paperConference paper

    5 Citations (Scopus)

    Abstract

    © 2015 SPIE. We propose a new reconstruction algorithm for photoacoustic and laser-ultrasound imaging based on reversetime migration (RTM), a time reversal imaging algorithm originally developed for exploration seismology. RTM inherently handles strong velocity heterogeneity and complex propagation paths. A successful RTM analysis with appropriate handling of boundary conditions results in enhanced signal-to-noise, accurately located structures, and minimal artifacts. A laser-ultrasound experiment begins with a source wavefield generated at the surface that propagates through the sample. Acoustic scatterers in the propagation path give rise to a scattered wavefield, which travels to the surface and is recorded by acoustic detectors. To reconstruct the laser-ultrasound image, a synthetic source function is forward propagated and cross-correlated with the time-reversed and back-propagated recorded (scattered) wavefield to image the scatterers at the correct location. Conversely, photoacoustic waves are generated by chromophores within the sample and propagate "one-way" to the detection surface. We utilize the velocity model validated by the laser-ultrasound reconstruction to accurately reconstruct the photoacoustic image with RTM. This approach is first validated with simulations, where inclusions behave both as a photoacoustic source and an acoustic scatterer. Subsequently, we demonstrate the capabilities of RTM with tissue phantom experiments using an all-optical, multi-channel acquisition geometry.
    Original languageEnglish
    Title of host publicationProceedings Volume 9323, Photons Plus Ultrasound: Imaging and Sensing 2015
    Place of PublicationWashington, USA
    PublisherSPIE
    Pages1-7
    Volume9323
    ISBN (Print)9781628414134
    DOIs
    Publication statusPublished - 2015
    EventSPIE BiOS 2015 - San Francsisco, United States
    Duration: 7 Feb 201512 Feb 2015

    Conference

    ConferenceSPIE BiOS 2015
    CountryUnited States
    CitySan Francsisco
    Period7/02/1512/02/15

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