Abstract
Optical imaging methods by use of interaction between the ultrasonic wave and the light have been proposed for medical diagnosis using spectroscopic information. The optical absorption information was obtained from the dependence of ultrasonic velocity on the light intensity and wavelength. The ultrasonic velocity change caused by light illumination was detected even in the medium with high scattering coefficient equivalent to the reported value of human brain. Images of absorption objects hidden in a model tissue sample were reconstructed from ultrasonic velocity change due to light illumination.
