Modeling of nonphase mechanisms in ultrasonic modulation of light propagation.

Published

Journal Article

While phase variation due to ultrasonic modulation of coherent light has been extensively studied in acousto-optical imaging, fewer groups have studied nonphase mechanisms of ultrasonic modulation, which may be important in exploring ultrasonic modulation of incoherent light for imaging. We have developed a versatile Monte Carlo based method that can model not only phase variation due to refractive index changes and scatterer displacement in tissue or tissue-like phantoms, but also amplitude and exit location variations due to the changes in optical properties and refractive index under ultrasonic modulation, in which the exit location variation has not, to the best of our knowledge, been modeled previously. Our results show that the modulation depth due to the exit location variation is three orders of magnitude higher than that due to amplitude variation, but two to three orders of magnitude lower than that due to phase variation for monochromatic light. Furthermore it is found that the modulation depth in reflectance due to the exit location variation is larger than that in transmittance for small source-detector separations.

Full Text

Duke Authors

Cited Authors

  • Liu, Q; Norton, S; Vo-Dinh, T

Published Date

  • July 2008

Published In

Volume / Issue

  • 47 / 20

Start / End Page

  • 3619 - 3630

PubMed ID

  • 18617978

Pubmed Central ID

  • 18617978

Electronic International Standard Serial Number (EISSN)

  • 1539-4522

International Standard Serial Number (ISSN)

  • 0003-6935

Digital Object Identifier (DOI)

  • 10.1364/ao.47.003619

Language

  • eng