Optical coherence tomography apparatus, imaging method, and non-transitory computer readable medium storing imaging program

An imaging method comprising:

• branching a light beam emitted from a wavelength sweeping laser light source into an object light beam and a reference light beam;
• applying the object light beam to a predetermined scanning range of a measurement object through a transparent substrate including a structure configured to change a thickness of the transparent substrate,
• wherein the structure is on a surface of the transparent substrate,
• wherein the transparent substrate comprises a frame disposed parallel to a direction orthogonal to the depth direction, and
• wherein the structure comprises a plurality of steps formed in such a way that the thickness of the transparent substrate gradually changes toward a center of the transparent substrate;
• generating information about a change in an intensity ratio of interference light beams, the interference light beams being generated by the interference between the object light beam scattered from the measurement object and the reference light beam;
• acquiring, by a computer, structural data of the measurement object in a depth direction using the information about the change in the intensity ratio of the interference light beams;
• acquiring, by the computer, a plurality of pieces of the structural data in the depth direction while moving an irradiation position of the object light beam along a direction orthogonal to the depth direction of the measurement object;
• and
• connecting, by the computer, the acquired plurality of pieces of the structural data in the depth direction with a position of the structure as a reference.

A non-transitory computer readable medium storing an imaging program, which if executed, causes a computer to execute operations comprising:

• acquiring structural data of a measurement object in a depth direction using information about a change in an intensity ratio of interference light beams,
• wherein the interference light beams are generated by interference between an object light beam and a reference light beam,
• wherein the object light beam is scattered from the measurement object, after the object light beam branched from a light beam emitted from a wavelength sweeping laser light source and then passes through a transparent substrate including a structure configured to change a thickness of the transparent substrate, the structure being on a surface of the transparent substrate, and then is applied to a predetermined scanning range of the measurement object, and
• wherein the reference light beam is branched from the light beam emitted from the wavelength sweeping laser light source;
• acquiring a plurality of pieces of the structural data in the depth direction while moving an irradiation position of the object light beam along a direction orthogonal to the depth direction of the measurement object;
• and
• connecting the acquired plurality of pieces of the structural data in the depth direction with a position of the structure as a reference,
• wherein the transparent substrate comprises a frame disposed parallel to a direction orthogonal to the depth direction, and
• wherein the structure comprises a plurality of steps formed in such a way that the thickness of the transparent substrate gradually changes toward a center of the transparent substrate.