Imaging apparatus, imaging method, and storage medium

An imaging method comprising:

• acquiring a tomographic image indicating a polarization state of a return beam from subject based on beams of different polarization states obtained by combining the return beam from the subject and a reference beam;
• and
• controlling an optical path length difference between the return beam and the reference beam according to positional information of a predetermined fundus layer in the tomographic image indicating the polarization state,
• wherein the predetermined fundus layer is the layer that scrambles the polarization state of a beam or the layer having birefringence.

An imaging apparatus comprising:

• a light source;
• a first unit configured to split light emitted from the light source to a measuring beam and a reference beam;
• a combining unit configured to combine a return beam from a subject irradiated with the measuring beam and a return beam from a mirror irradiated with the reference beam into a combined beam;
• a second unit configured to split the combined beam into beams of different polarization directions;
• a tomographic image acquisition unit configured to acquire, based on beams of different polarizations obtained by the second unit performing splitting, a tomographic image indicating a polarization state of the return beam from the subject;
• and
• a control unit configured to control a position of the mirror according to positional information of a predetermined fundus layer in the tomographic image,
• wherein the predetermined fundus layer is the layer that scrambles the polarization state of a beam or the layer having birefringence.

An imaging apparatus configured to acquire a tomographic image of a subject, the imaging apparatus comprising:

• a light source;
• a first fiber coupler configured to split light emitted from the light source into a measuring beam and a reference beam;
• a mirror configured to reflect the reference beam;
• a second fiber coupler configured to combine a return beam from a subject irradiated with the measuring beam and the reference beam reflected by the mirror into a combined beam;
• a third fiber coupler configured to split the combined beam into a first beam and a second beam of different polarization directions;
• a first line sensor configured to convert the first beam to an electrical signal;
• a second line sensor configured to convert the second beam to an electrical signal;
• a signal processing unit configured to acquire, based on the electrical signals converted by the first line sensor and the second line sensor, a tomographic image indicating a polarization state of the return beam from the subject;
• and
• a control unit configured to control a position of the mirror according to positional information of a predetermined fundus layer in the tomographic image,
• wherein the predetermined fundus layer is the layer that scrambles the polarization state of a beam or the layer having birefringence.