Optical coherence tomographic apparatus and optical coherence tomographic method

An optical coherence tomographic apparatus, comprising:

• a light source that emits light having a light source spectrum with a plurality of wavelength components;
• an interference light generator that branches the light from the light source, causes one branch light to enter an imaging object via an objective lens, collects light reflected from the imaging object with the objective lens, and couples the collected light to different branch light, thereby generating interference light;
• a detector that detects the interference light;
• and
• a signal processor that determines a reflected light intensity distribution of the imaging object on the basis of the spectrum of the detected interference light, wherein
• the signal processor performs spectrum conversion, having a conversion characteristic with which the light source spectrum is converted to a Gaussian distribution curve, on the spectrum of the interference light, and determines the reflected light intensity distribution by Fourier-transforming a spectrum resulting from the spectrum conversion, and
• in the conversion characteristic, the light source spectrum and the Gaussian distribution curve have center wavelengths differing from each other.