Based on measurement of the intensity autocorrelation function, a new method to determine the modulation depth of scattered laser light modulated by an ultrasonic wave in turbid media was applied to ultrasound-modulated optical tomography. Good signal-to-noise ratios and high sensitivities were demonstrated. Images of double optically absorbing objects buried in a highly optically scattering gel sample were obtained. The contrast was more than 10%, and the spatial resolution was approximately 2 mm.
© 2002 Optical Society of America
(030.6140) Coherence and statistical optics : Speckle
(110.7170) Imaging systems : Ultrasound
(170.3880) Medical optics and biotechnology : Medical and biological imaging
(170.5270) Medical optics and biotechnology : Photon density waves
(170.7050) Medical optics and biotechnology : Turbid media
Hui Li and Lihong V. Wang, "Autocorrelation of Scattered Laser Light for Ultrasound-Modulated Optical Tomography in Dense Turbid Media," Appl. Opt. 41, 4739-4742 (2002)