Laser Computed Tomographie Bioimaging by Means of Coherent Detection Imaging — CDI Scheme II
Although the Idea of Imaging inside the living body with optical wavelengths Is attractive and challenging, strong light scattering by the tissues and other optical distortions creates severe practical difficulties. In order to overcome the diffuse nature of the optical image quality In biomedical tissues and other systems specified as highly scattering absorptive media, we have proposed and verified for the first time, as far as we are aware, the usefulness of the optical heterodyne technique. It should be pointed out here that this technique possesses the potentiality to achieve image detection in highly scattering absorptive media for which the conventional direct detection technique can not be employed due to the presence of widely dispersive multiple scattering and hence the basic limitation in the signal-to-noise ratio. Wc believe that the heterodyning method offers practically the feasibility and advantages for the application to not only biological tissues, systems and substances but also various objects and environments surrounded and/or covered by smoke, fog, cloud and other obstacles.