Ultrasound-modulated optical tomography is a dual-wave sensing technique in which diffusive light in a turbid medium interacts with an imposed acoustic field. A phase-modulated photon field emanates from the interaction region and carries with it information about the optomechanical properties of the medium. We present a technique for detection of ultrasound-induced optical phase modulation using an adaptive, photorefractive-crystal-based interferometry system. Experimental results are presented demonstrating detection of ultrasound-modulated signals in highly scattering media by use of pulsed ultrasound insonation.
© 2004 Optical Society of America
(110.7050) Imaging systems : Turbid media
(110.7170) Imaging systems : Ultrasound
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(160.5320) Materials : Photorefractive materials
(170.3880) Medical optics and biotechnology : Medical and biological imaging
Todd W. Murray, Lei Sui, Gopi Maguluri, Ronald A. Roy, Alex Nieva, Florian Blonigen, and Charles A. DiMarzio, "Detection of ultrasound-modulated photons in diffuse media using the photorefractive effect," Opt. Lett. 29, 2509-2511 (2004)