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Amplitude-masked photoacoustic wavefront shaping and application in flowmetry
  • Published Date:
    Oct 1 2014
  • Source:
    Opt Lett. 2014; 39(19):5499-5502.
Filetype[PDF - 896.97 KB]


Details:
  • Pubmed ID:
    25360912
  • Pubmed Central ID:
    PMC4217128
  • Funding:
    DP1 EB016986/DP/NCCDPHP CDC HHS/United States
    DP1 EB016986/EB/NIBIB NIH HHS/United States
    R01 CA157277/CA/NCI NIH HHS/United States
    R01 CA159959/CA/NCI NIH HHS/United States
    R01 CA159959/CA/NCI NIH HHS/United States
    R01 CA186567/CA/NCI NIH HHS/United States
    R01 CA186567/CA/NCI NIH HHS/United States
    R01CA157277/CA/NCI NIH HHS/United States
  • Document Type:
  • Collection(s):
  • Description:
    Optical-resolution photoacoustic flowmetry (PAF) allows noninvasive single-cell flow measurements. However, its operational depth is limited by optical diffusion, which prevents focusing beyond shallow depths in scattering media, as well as reducing the measurement signal-to-noise ratio (SNR). To overcome this limitation, we used binary-amplitude wavefront shaping to enhance light focusing in the presence of scattering. Here, the transmission modes that contributed constructively to the intensity at the optical focus were identified and selectively illuminated, resulting in a 14-fold intensity increase and a corresponding increase in SNR. This technique can potentially extend the operational depth of optical-resolution PAF beyond 1 mm in tissue.