INTERNAL OBSERVATION DEVICE, INTRAVITAL OBSERVATION DEVICE, AND INTERNAL OBSERVATION ENDOSCOPE FOR USE ON A LIGHT-SCATTERING SUBJECT, AND INTERNAL OBSERVATION METHOD

摘要

Provided is an internal observation device, such as an endoscope, that can perform internal observation by illuminating a tiny area of the surface of a light-scattering subject (for example, bodily tissue) and detecting backscattered light therefrom. By using a detection region larger than the illuminated region, the amount of detected light can be increased, the amount of time needed to detect an observation target (for example, a blood vessel) can be decreased, and deeper regions can be detected, with a simple and inexpensive configuration.