Patent ID: 9593933
Date: 2017-03-14
CPC Classifications: A61B,G01B,G06T

Claim:
1. A method for calibrating and correcting scanning distortion of an optical coherence tomography system, wherein the method comprises the following phases: i) selecting a 3-D reference pattern which comprises a number of known reference points which are described in a number of real 3-D coordinates; ii) acquiring 3-D images of the reference pattern selected in phase i), the reference pattern being located in an object space of the optical coherence tomography system, by means of the optical coherence tomography system, the optical coherence tomography system providing the 3-D images by obtaining axial images of a sample at different lateral positions achieved by a lateral scanning of the sample; iii) identifying, in the images acquired of the reference pattern, a number of positions of a number of reference points described in a number of local 3-D coordinates provided by the optical coherence tomography system, which correspond to the reference points known in phase i); iv) obtaining a mathematical distortion relationship which defines a transformation between the local 3-D coordinates provided by the optical coherence tomography system and a number of real 3-D coordinates, the mathematical relationship being based on the comparison of the positions of the known reference points in the local 3-D coordinates of phase iii) and in the real 3-D coordinates in phase i); and v) correcting the distortion by means of applying the mathematical distortion relationship obtained in phase iv) to the data obtained by the optical coherence tomography system.