Patent ID: 7954946

Claim:
An optical tomographic photographing apparatus comprising: an optical coherence tomography optical system arranged to detect spectral information from interference light of measurement light projected onto an examined object and reference light, and comprising an optical scanner arranged to scan in a transverse direction the measurement light which is emitted from a light source on the examined object; and a driving unit arranged to change an optical path length by moving an optical member disposed in an optical path of one of the reference light and the measurement light in an optical axis direction; a memory arranged to store, (1) for obtaining a first observation image, first dispersion correction data for correcting first spectral information that is obtained in a state that a depth position at which an optical path length of the measurement light and an optical path length of the reference light become equal is positioned in a front direction of the examined object, and (2) for obtaining a second observation image, second dispersion correction data for correcting second spectral information that is obtained in a state that the depth position is positioned in a back direction of the examined object, the second dispersion correction data being different from the first dispersion correction data; and a control unit arranged to obtain a tomographic image of the examined object by reading out the dispersion correction data corresponding to the first spectral information or the second spectral information from the memory, correcting the spectral information using the read-out dispersion correction data, and performing Fourier analysis on the corrected spectral information.