title: Photorefractive detection of tagged photons in ultrasound modulated optical tomography of thick biological tissues.
abstract: We present a new and simple method to obtain ultrasound modulated optical tomography images in thick biological tissues with the use of a photorefractive crystal. The technique offers the advantage of spatially adapting the output speckle wavefront by analysing the signal diffracted by the interference pattern between this output field and a reference beam, recorded inside the photorefractive crystal. Averaging out due to random phases of the speckle grains vanishes, and we can use a fast single photodetector to measure the ultrasound modulated optical contrast. This technique offers a promising way to make direct measurements within the decorrelation time scale of living tissues.
authors.forename: F
authors.initials: F
authors.lastname: Ramaz
authors.forename: B
authors.initials: B
authors.lastname: Forget
authors.forename: M
authors.initials: M
authors.lastname: Atlan
authors.forename: A C
authors.initials: AC
authors.lastname: Boccara
authors.forename: M
authors.initials: M
authors.lastname: Gross
authors.forename: P
authors.initials: P
authors.lastname: Delaye
authors.forename: G
authors.initials: G
authors.lastname: Roosen