Pulsed ultrasound modulated optical tomography utilizing the harmonic response of lock-in detection
Ultrasound modulated optical tomography (USMOT) can image the optical properties of a scattering medium at a spatial resolution approaching that of ultrasound (US). A lock-in parallel speckle detection technique is proposed to detect pulsed US modulated light using a multipixel detector. The frequ...
| Main Authors: | , , |
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| Format: | Article |
| Published: |
Optical Society of America
2013
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| Online Access: | https://eprints.nottingham.ac.uk/2727/ |
| Summary: | Ultrasound modulated optical tomography (USMOT) can image the optical properties of a scattering
medium at a spatial resolution approaching that of ultrasound (US). A lock-in parallel speckle detection
technique is proposed to detect pulsed US modulated light using a multipixel detector. The frequency
components of the pass band match those of the US pulse train and provide efficient detection. The modulation
depth is extracted by taking the difference between a pair of speckle patterns modulated by a pair
of phase-inversed US bursts. Modification to pulse inversion mode enables the second harmonic US
modulation due to nonlinear US propagation to be detected. © 2013 Optical Society of America
OCIS codes: (110.6150) Speckle imaging; (110.0113) Imaging through turbid media. |
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