Geometric Calibration of an OCT Imaging System
Résumé
This paper deals with an OCT (optical coherence tomography) geometric calibration method. OCT medical imag- ing system has received a growing interest during the last two decades. In medical purposes, OCT images are generally called optical biopsies which allows in-vivo investigation almost similar to a histopathological study. The physician can rely on the OCT images to establish a rapid and direct diagnosis. But the OCT images formation suffered numerous distortions due in particular to the complex optical path, from the source to the viewed sample passing through than two reflecting mirrors and a scan objective. The obtained optical biopsies include several spectral and geometric distortions. The proposed calibration model aims to compensate the distortions. More precisely, two models were developed allowing the correction of both 2D images (B-Scan slices) and 3D images (volume). These models were experimentally validated (in both artificial and biological samples) using a spectral domain OCT system. It has demonstrated a significant enhancement of the OCT images accuracy.
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