Abstract
A method using ultrasonic velocity change due to light absorption was investigated in order to realize practical optical computed tomography. The phase shift of ultrasonic wave was observed even in the medium with a scattering coefficient equivalent to that of the human brain when ultrasonic wave passed through absorption object under light illumination. The optical image of the absorption region in a scattering medium was reconstructed from the projection data of ultrasonic phase shift due to light illumination. The shape of the absorbing object hidden in the chicken tissue was recognized by detecting the ultrasonic phase shift due to light illumination.
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