Patent ID: 7408648

Claim:
A method for tomographically displaying a cavity by Optical Coherence Tomography (OCT), comprising: emitting light with a coherent laser light source; splitting the emitted light into a measuring light beam and a reference light beam; inserting a scanning head with a catheter which contains the measuring light beam into the cavity; scanning a surrounding of the cavity in a plane with the scanning head; tomographically displaying the surrounding of the cavity based on detected interferences and intensities between the measuring light beam and the reference light beam, wherein a length of the measuring light beam changes as a result of a movement of the catheter and brings a change in a display scale of the cavity; determining the change in the length of the measuring light beam as the result of the movement of the catheter; and automatically compensating the change in the length of the measuring light beam as the result of the movement of the catheter, wherein the change in the length of the measuring light beam is directly determined via an additional interferometer used for calibration.