Wavelight Gmbh

Alcon, Inc.

Henning Wisweh

Klaus Wolfgang Vogler

Claudia Gorschboth

Ole Massow

Tobias Jeglorz

Klaus Vogler

In a process for optical coherence tomography a plurality of first OCT slice images, in each first slice image representing a different slice of an object, are recorded. Subsequently a reference figure that is representative of the three-dimensional contour of at least one structural feature of the object in a given three-dimensional coordinate system is ascertained by feature recognition of the at least one structural feature in the first slice images. Then a plurality of second OCT slice images, each second slice image representing a different slice of the object, are recorded. At least a fraction of the second slice images are displaced in the coordinate system until each second slice image is in feature overlap with the reference figure. Lastly, a set of three-dimensional OCT image data is generated at least from the feature-overlapped second slice images.

Process for optical coherence tomography and apparatus for optical coherence tomography

An optical coherence tomography device comprises a light generator, a dispersive medium, an optical coupler and a detector. The light generator is adapted to generate a series of input pulses of coherent light, each input pulse having an input pulse width. The dispersive medium has an input that is optically coupled to the light generator and an output for output pulses. The dispersive medium is adapted to stretch the input pulse width to an output pulse width of each of the output pulses by chromatic dispersion. The optical coupler is adapted to couple the output pulses into a reference arm and a sample arm. The optical coupler is further adapted to superimpose light returning from the reference arm and the sample arm. The detector is adapted to detect an intensity of interference of the superimposed light with a temporal resolution of a fraction of the output pulse width.

Optical coherence tomography technique

A technique for optical coherence tomography is provided. As to a device aspect of the technique, an imaging device comprises a base defining a rotation axis, a scanning and focusing assembly mounted to the base for rotation about the rotation axis, and a drive unit for rotationally driving the scanning and focusing assembly about the rotation axis. The scanning and focusing assembly includes a focusing device for focusing a beam of imaging radiation to produce a focused beam of imaging radiation having a focus, a scanning member for scanning the beam of imaging radiation, and a controller coupled to the drive unit and the scanning member and configured to control the scanning member to cause movement of the focus along a predetermined trajectory with respect to the scanning and focusing assembly.

Imaging technique for optical coherence tomography

In certain embodiments, a device for optical coherence tomography (OCT) includes a signal detection device and a computer arrangement. The signal detection device is designed to detect an interference signal (G(&#x3c9;)) for an object to be imaged in an optical frequency range (&#x3c9;). The computer arrangement is designed to determine intermediate signals (G(), G()) in a spatial frequency range (k) from the intermediate interference signal (G(&#x3c9;)), whereby each of the intermediate signals (G(), G()) is dispersion-compensated for a different depth (z, z) of the object. A locally resolved image signal (FFT, FFT) is determined for each of the intermediate signals (G(), G()) by applying a Fourier transformation to the particular intermediate signal (G(), G()). A tomography signal (G(z)) is determined from the image signals (FFT, FFT).

Device for optical coherence tomography

In certain embodiments, a device for optical coherence tomography (OCT) includes a signal detection device and a computer arrangement. The signal detection device is designed to detect an interference signal (G(&#x3c9;)) for an object to be imaged in an optical frequency range (&#x3c9;). The computer arrangement is designed to determine intermediate signals (G(k), G(k)) in a spatial frequency range (k) from the interference signal (G(&#x3c9;)), whereby each of the intermediate signals (G(k), G(k)) is dispersion-compensated for a different depth (z, z) of the object. A locally resolved image signal (FFT, FFT) is determined for each of the intermediate signals (G(k), G(k)) by applying a Fourier transformation to the particular intermediate signal (G(k), G(k)). A tomography signal (G(z)) is determined from the image signals (FFT, FFT).

Growing community of inventors

Hannover, Germany

Henning Wisweh