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| Imaging an object within turbid medium using ultrasound-modulated light transport.Lihong Wang at Texas A&M University is developing a form of imaging called "ultrasound-modulated light transport". A focused ultrasound beam is used to modulate at 1 MHz the photons that pass through the small ~1-mm^3 focal region of the ultrasound beam. Photons are launched into the medium (or tissue) and collected on the other side. However, only those few photons that pass through the focal region of the ultrasound beam will be modulated at 1 MHz. The detected 1-MHz signal can be attributed to the small focal region to yield one voxel of information regarding the medium. Scanning the ultrasound focus through the medium allows multiple voxel accumulatiojn and image reconstruction.Figure at left shows a small cube within a 5-cm thick phantom of turbid medium. Objects with optical differences in either absorption or scattering relative to the medium can be detected. |
- L.-H. Wang, S. L. Jacques, and X.-M. Zhao, "Continuous-wave ultrasonic modulation of scattered laser light to image objects in turbid media," Optics Letters 20, 629-631 (1995).
- L.-H. Wang and X.-M. Zhao, "Ultrasound-modulated optical tomography of absorbing objects buried in dense tissue-simulating turbid media," Applied Optics 36, 7277-7282 (1997).
- L.-H. Wang, "Ultrasonic modulation of scattered light in turbid media and a potential novel tomography in biomedicine," Photochemistry and Photobiology (in press).
Texas A&M University, Optical Imaging Laboratory
http://biomed.tamu.edu/~lw