パルス超音波変調による拡散光画像化法

抄録

We investigated NIR tomographic imaging based on the pulsed-ultrasound modulation of diffuse light field in turbid media theoretically and experimentally. The difficulty of the method is the very low S/N which cannot be overcome by the conventional signal-averaging because of the slowly-varying light phase on the detector. We proposed a simple model for the detected signal and validated it experimentally. Furthermore, we proposed the frequency-doubling-and-averaging method to recover the signal, and demonstrated its effectiveness through the phantom experiment. We present a 2-D tomographic image of the high-scattering inclusion in the scattering medium.