Blood vessel imaging system

摘要

A blood vessel imaging system includes a measuring light source which emits a measuring light beam. An optical heterodyne detection system consists of an optical system which splits the measuring light beam into a first light beam traveling to impinge upon an organism and a second light beam traveling not to impinge upon the organism and combines the second light beam with the first beam emanating from the organism into a combined light beam, a frequency shifter which causes the first and second light beams to have frequencies different from each other, and a beat component detector which detects beat components of the combined light beam. An image signal is generated on the basis of the ratio of the intensity of a pulsation wave band signal to the intensity of a beat signal included in an output signal of the optical heterodyne detection system.