1. Articles from Stefan Oelckers

    1-5 of 5
    1. Optimising deep anterior lamellar keratoplasty (DALK) using intraoperative online optical coherence tomography (iOCT)

      Optimising deep anterior lamellar keratoplasty (DALK) using intraoperative online optical coherence tomography (iOCT)

      Background/aims To describe the use of intraoperative online optical coherence tomography (iOCT) for improving deep anterior lamellar keratoplasty (DALK) surgery. Methods Retrospective case series of 6 eyes of 6 male patients with keratokonus, corneal dystrophy or herpetic stromal scars undergoing DALK were investigated using intraoperative optical coherence tomography and postsurgical image/video analysis. Main outcome measures were: visibility of surgical steps, especially, assessment of placement depth of injection needle, preparation of bare Descemet's membrane and drainage of interface fluid. Results iOCT enables real-time visualisation of all surgical steps of DALK procedure in all patients. Placement of air injection ...

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    2. Optimizing Descemet Membrane Endothelial Keratoplasty Using Intraoperative Optical Coherence Tomography

      Optimizing Descemet Membrane Endothelial Keratoplasty Using Intraoperative Optical Coherence Tomography

      Importance Descemet membrane endothelial keratoplasty (DMEK) is a challenging procedure for the surgeon, particularly because of deficient visibility of the delicate tissue due to the natural en face view through the operating microscope. A cross-sectional view would greatly enhance intraoperative overview and enable the surgeon to better control the procedure. Objective To retrospectively analyze the use of intraoperative optical coherence tomography (iOCT) for improving the safety of DMEK. Design Intraoperative OCT during DMEK was performed in 26 eyes of 26 patients. We retrospectively analyzed imaging and video data. Setting Department of Ophthalmology, University of Cologne. Participants Seven men and 19 ...

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    3. Real-time volumetric optical coherence tomography OCT imaging with a surgical microscope

      Real-time volumetric optical coherence tomography OCT imaging with a surgical microscope
      Optical coherence tomography is a unique technique to visualize subsurface tissue structures with a resolution below 10μm during microsurgery without tissue contact. Since it was introduced more than 15 years ago imaging speed was boosted by more than three orders of magnitude, from less than 100 to more than 300,000 A-scans per second. Instead of taking only still images of anatomical structures, the increased speed of OCT allows now to image volumes nearly in real time. This enables not only the scanning of larger tissue surfaces, but also opens new application beyond simple diagnosis. A noncontact volumetric imaging with ...
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    4. Optical coherence tomography with online visualization of more than seven rendered volumes per second

      Optical coherence tomography with online visualization of more than seven rendered volumes per second
      Nearly real-time visualization of 3-D volumes is crucial for the use of optical coherence tomography (OCT) during microsurgery. With an ultrahigh speed spectral domain OCT coupled to a surgical microscope, on-line display of 7.2 rendered volumes at 87 megapixels per second is demonstrated. Calculating the A-scans from the spectra is done on a quad-core personal computer (PC), while dedicated software for the 3-D rendering is executed on a high performance video card. Imaging speed is practically only limited by the readout of the camera. First experiments show the feasibility of real-time 3-D OCT for guided interventions.
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    5. 3-D intraoperative imaging combining an operating microscope with optical coherence tomography (OCT)

      Objective Optical coherence tomography (OCT) allows non-contact/non-invasive analysis of tissues with a penetration depth of 2–3 mm reaching a spatial resolution of approximately 4–15 μm. This resolution is compatible with the resolution of modern operation microscopes. Aim of this work was to provide a three-dimensional (3D) intraoperative visualization of tissue structures. Material and methods A high-speed spectral domain OCT (a modified version of the Ganymed, Thorlabs HL) was adapted to a motorized operation microscope (HR 1000, Möller-Wedel). Via a specially designed two axis-scanner, the 840 nm OCT was adapted directly to a camera port of the operation ...
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    1-5 of 5
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    1. (5 articles) University of Lübeck
    2. (2 articles) University of Cologne
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    Optical coherence tomography with online visualization of more than seven rendered volumes per second Real-time volumetric optical coherence tomography OCT imaging with a surgical microscope Optimizing Descemet Membrane Endothelial Keratoplasty Using Intraoperative Optical Coherence Tomography Optimising deep anterior lamellar keratoplasty (DALK) using intraoperative online optical coherence tomography (iOCT) Post-Doctoral and Graduate Student Research Positions at the University of Illinois Urbana-Champaign Multiscale correlation of microvascular changes on optical coherence tomography angiography with retinal sensitivity in diabetic retinopathy Macrophage targeted theranostic strategy for accurate detection and rapid stabilization of the inflamed high-risk plaque PERSONALIZED CHARACTERISTICS OF MORPHOMETRIC AND FUNCTIONAL PARAMETERS OF RETINA IN ARTERIAL HYPERTENTION ACCORDING TO OPTICAL COHERENCE TOMOGRAPHY-ANGIOGRAPHY DATA Coherence function-encoded optical palpation Systems, methods, and media for multiple reference arm spectral domain optical coherence tomography Monitoring dissolution of a dosage form in progress during dissolution by low coherence interferometry Two Postdoc Openings at the Physical Optics and Biophotonics Group at Institute of Physical Chemistry, Warsaw, Poland