Back to Search Start Over

Bimodal endoscopic probe combining white-light microscopy and optical coherence tomography.

Bimodal endoscopic probe combining white-light microscopy and optical coherence tomography.

Authors :
Blattmann M
Kretschmer S
Thiele S
Ataman C
Zappe H
Herkommer A
Seifert A
Source :
Applied optics [Appl Opt] 2016 May 20; Vol. 55 (15), pp. 4261-9.
Publication Year :
2016

Abstract

We present a novel bimodal endoscopic imaging probe that can simultaneously provide full-field white-light video microscopy and confocal optical coherence tomography (OCT) depth scans. The two modalities rely on spectrally separated optical paths that run partially in parallel through a micro-optical bench system, which has a cross-section of only 2  mm×2.76  mm and is realized via standard silicon micromachining techniques. With a numerical aperture of 0.061, the video modality has a resolution and field of view of 9.3 and 1240  μm×1080  μm, respectively. The resolution is limited by the pixel spacing of the coherent fiber bundle, which relays the acquired image from the distal to the proximal end. A custom-designed diffractive optical element placed within the video imaging path significantly improves the image contrast by up to 45% in the medium frequency range. The OCT modality is optimized for 830 nm center wavelength, and works in a confocal arrangement with an NA of 0.018. It provides single-point depth probing at the center of the video image with a lateral resolution of 20 μm. Through its compact footprint and enhanced functionality, the probe can provide depth-resolved guiding capability for existing laparoscopes and represents a major step toward a new class of multimodal endoscopic imaging probes.

Details

Language :
English
ISSN :
1539-4522
Volume :
55
Issue :
15
Database :
MEDLINE
Journal :
Applied optics
Publication Type :
Academic Journal
Accession number :
27411158
Full Text :
https://doi.org/10.1364/AO.55.004261