A NANO-SENSITIVE FOURIER-DOMAIN OPTICAL COHERENCE TOMOGRAPHY INSPECTION SYSTEM

摘要

An OCT imaging system (100) comprising a radiation emitter (SLD), a radiation receiver CCD), an interferometer (FC, PC, X-Scan, Y-Scan), a controller (COMP) which controls the emitter and processes received radiation data according to OCT to provide an output image. The controller (COMP) forms a spectrum of spatial frequencies along the depth direction. It calculates from the spectrum local spectra of spatial frequencies or periods along the depth direction for individual volume elements along the depth direction. It translates the local spectra of spatial frequencies or periods along the depth direction into the OCT image domain. It maps the local spectra into the volume elements to provide sensitivity on the nano-scale whereas the volume elements are in the micro-scale. The controller calculates information parameters from the translated and mapped local spectra. Thus the system (100) achieves nano-scale sensitivity although the volume elements are at the micro-scale.

主权项

1. An OCT imaging method performed by an OCT system including a radiation emitter, a radiation receiver, an interferometer, and a controller adapted to control the emitter and to process received radiation data according to OCT to provide an output image, and the method comprising the steps of the controller:
a. forming a spectrum of spatial frequencies along the depth direction; b. calculating from the spectrum of step (a) local spectra of spatial frequencies or periods along the depth direction for individual volume elements, c. translating the local spectra of spatial frequencies or periods of step (b) into the OCT image domain, d. mapping said local spectra into the volume elements to provide a sensitivity on a scale smaller by at least one order of magnitude than that of the volume elements; and e. calculating information parameters from the translated and mapped local spectra of steps (c) and (d).