Optical tomographic image acquisition apparatus and method of acquiring optical tomographic image

An optical tomographic image acquisition apparatus comprising:

• a light source unit which emits light;
• a light dividing device which divides the light emitted from the light source unit into measurement light and reference light;
• a projecting device which is arranged inside a tubular sheath having translucency to project the measurement light divided by the light dividing device onto an object to be measured outside the sheath;
• a combining device which combines reflected light reflected from the object to be measured or the sheath and the reference light;
• an interference light detecting device which detects interference light between the reflected light and the reference light combined by the combining device;
• an interference signal acquiring device which acquires an interference signal at each frequency by performing frequency analysis on the interference light detected by the interference light detecting device;
• a tomographic image acquiring device which acquires an optical tomographic image at each scanning position of the object to be measured based on the interference signals acquired by the interference signal acquiring device;
• and
• a reference position adjustment section which detects a sheath interference signal that is an interference signal of the reflected light reflected from the sheath from the interference signals acquired by the interference signal acquiring device and adjusts an optical tomographic image reference position as a reference to acquire the optical tomographic image based on the detected sheath interference signal.