@article{viator99d,
  author = {John A. Viator and Steve L. Jacques and Scott Prahl},
  title = {Photoacoustic Imaging of Optical Absorbers in Tissue Phantoms Using the Ray Method of Matched Field Processing},
  journal = {Proceedings of the Oregon Academy of Science},
  volume = {35},
  pages = {61},
  year = {1999 abstract only},
  abstract = {Acoustic waves can be generated in optically absorbing tissue by rapidly depositing energy from a laser into a confined region. The resultant acoustic wave propagating from the source can be modeled by the wave equation while considering suitable boundary conditions and material properties of the medium. Matched field processing is a method originating in ocean acoustics that correlates an acoustic propagation model based on the wave equation with experimental data to form an ambiguity map which indicates the location of the acoustic source in an ocean waveguide. Although ray methods for describing acoustic propagation are simple and intuitive, its derivation depends on a high frequency approximation not applicable to ocean acoustics. Tissue photoacoustics, however, takes place in the frequency range of 1--100 MHz, thus making the ray method an ideal choice. In the experiments described here, an optically induced acoustic source is localized in a gelatin tissue phantom with matched field processing using ray methods to model the acoustic field.},
}