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