Optical tomography apparatus, optical tomography method, and optical coherence tomography apparatus

An optical tomography method, comprising splitting light emitted from a wavelength swept light source device into measurement light and reference light, acquiring a tomographic image of an object to be measured based on light obtained by combining return light from the object to be measured by the measurement light and the reference light corresponding to the measurement light,

• the method comprising:
• performing a first wavelength sweep of light wavelength in one direction from a short wavelength to a long wavelength by the wavelength swept light source device;
• performing a second wavelength sweep of light wavelength in one direction from a long wavelength to a short wavelength by the wavelength swept light source device, the first wavelength sweep and the second wavelength sweep being performed in an alternate manner;
• generating a first tomographic image based on a signal acquired in the first wavelength sweep;
• generating a second tomographic image based on a signal acquired in the second wavelength sweep;
• and
• combining the first tomographic image and the second tomographic image to acquire the tomographic image of the object to be measured,
• wherein the first wavelength sweep and the second wavelength sweep are performed at a same site of the object to be measured.

An optical coherence tomography apparatus, comprising:

• a wavelength swept light source unit;
• an optical coherence system configured to:
• split light emitted from the wavelength swept light source unit into reference light and irradiation light to be radiated to an object to be measured;
• and generate interference light between reflected light of the irradiation light radiated to the object to be measured and the reference light;
• and
• an acquiring unit configured to acquire depth direction information of the object to be measured corresponding to a measurement point on a surface of the object to be measured, based on the interference light, wherein:
• the wavelength swept light source unit is configured to perform a first wavelength sweep from a short wavelength to a long wavelength and a second wavelength sweep from a long wavelength to a short wavelength in an alternate manner;
• and
• the acquiring unit is configured to acquire the depth direction information of the object to be measured corresponding to the measurement point based on the interference light corresponding to the first wavelength sweep and the interference light corresponding to the second wavelength sweep.