Optical imaging apparatus, optical imaging method, apparatus for setting characteristics of a light source, and method for setting characteristics of a light source
An embodiment provides a method for setting the characteristics of the light to be output from a light source unit for optical coherence tomography, using a computer. This method is performed by using relation information in which a representative wavelength, a wavelength range including said representative wavelength, and the light loss amount due to absorption by a medium are related to each other. This method includes the following steps: setting each value of a first parameter and a second parameter among the representative wavelength, the wavelength range, and the light loss amount; acquiring a value of a third parameter among the representative wavelength, the wavelength range, and the light loss amount other than said first parameter and said second parameter based on the set two values and said relation information; and outputting a value of said acquired third parameter.
1. An optical imaging method, comprising the steps of:
determining a representative wavelength and a wavelength range including said representative wavelength based on relation information in which a representative wavelength, a wavelength range including this representative wavelength, and the light loss amount due to absorption by a medium are related to each other;
outputting light including the determined wavelength range;
dividing the output light into signal light and reference light;
generating interference light by superimposing the signal light having passed through an object onto the reference light;
detecting the generated interference light; and
forming a tomographic image of the object based on the detection result of the interference light,
wherein the relation information is information indicating that the light loss amount changes depending on the wavelength range even if a value of the representative wavelength is the same or information indicating that the light loss amount changes depending on the wavelength even if the wavelength range is the same, and
the representative wavelength, the wavelength range, and the light loss amount of the output light are based on a result from arbitrarily setting two of the representative wavelength, the wavelength range, and the light loss amount to determine a third of the representative wavelength, the wavelength range, and the light loss amount.
2. The optical imaging method according to claim 1 , further comprising:
converting the spectral distribution of the reference light into a predetermined spectral distribution such that a distortion of a spectrum distribution due to absorption by said medium is compensated in the spectral distribution of the interference light based on the signal light having passed through said medium, by using the relation information, and
wherein the interference light is generated by superimposing the signal light having passed through an object onto the reference light whose spectral distribution has been converted.