chapter  20
Ultrasonically Modulated Optical Imaging
ByFrançois Ramaz, Emmanuel Bossy, Michel Gross, A. Claude Boccara
Pages 32

Biological tissues exhibit a low absorption level in the deep red or near infrared. However, they are highly scattering media, so conventional optical tomographic methods are unable to provide good-quality images, especially in the scope to perform a resolution close to ultrasonography, which is in the mm3 range. To overcome this diculty, a number of techniques have been proposed, such as time-resolved optical imaging [1,2] and frequency-domain optical imaging [3], to select short photon paths and, even for shallow structures, optical coherence tomography [4-8], which selects ballistic photons. ese techniques have been proved to be successful in the determination of scattering and

20.1 Introduction ......................................................................................683 20.2 Principle of Acousto-Optic Imaging .............................................684 20.3 Digital O-Axis Holography/Adaptive Wavefront

20.6 Beyond Purely Ultrasonic Modulation: e Acoustic Radiation Force .................................................................................700