Biomedical Optics

Chapter 13 - Ultrasound-Modulated Optical Tomography

13.1.   INTRODUCTION

Ultrasound-modulated optical tomography (UOT), first demonstrated in the
1990s, is another hybrid method that combines optical contrast and ultrasonic
resolution as does photoacoustic tomography. UOT is based on the ultrasonic
modulation of coherent laser light in a scattering medium. The medium is
irradiated by both a laser beam and a focused ultrasonic wave. The ultrasound-
modulated component of the reemitted light, which carries information about the
local optical and acoustic properties, is used to provide tomographic imaging.
Consequently, the image contrast is related to the optical and acoustic properties,
whereas the spatial resolution is determined primarily by the ultrasonic
wave. Because all the ultrasound-modulated light—regardless of the number of
scattering events experienced—contributes to the imaging, UOT is capable of
imaging deeply into the optical quasidiffusive or diffusive regime.

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