Articles that mention University of Hannover -Optical Coherence Tomography News

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1. Mentioned In 21 Articles
2. Semantic denoising autoencoders for retinal optical coherence tomography
  
  Explore arxiv.org Mar 31 2019
  
  Noise in speckle-prone optical coherence tomography tends to obfuscate important details necessary for medical diagnosis. In this paper, a denoising approach that preserves disease characteristics on retinal optical coherence tomography images in ophthalmology is presented. By combining a deep convolutional autoencoder with a priorly trained ResNet image classifier as regularizer, the perceptibility of delicate details is encouraged and only information-less background noise is filtered out. With our approach, higher peak ...
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  Mentions: University of Hannover
3. Iterative wavefront correction for complex spectral domain optical coherence tomography
  
  Explore OSA | OSA Publishing Mar 16 2019
  
  We propose a compact setup for wavefront manipulation in spectral domain optical coherence tomography (OCT). The system can easily be implemented into existing free-space OCT setups through modification of the source path only. We demonstrate complex-valued OCT signal acquisition based on phase shifting combined with iterative optical wavefront shaping, which locally enhances the OCT signal acquired from within a scattering sample. The system lends itself to future imaging studies in ...
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  Mentions: University of Hannover
4. Deep learning based 2.5D flow field estimation for maximum intensity projections of 4D optical coherence tomography
  
  Explore arxiv.org Nov 1 2018
  
  In laser microsurgery, image-based control of the ablation laser can lead to higher accuracy and patient safety. However, camera-based image acquisition lacks the subcutaneous tissue perception. Optical coherence tomography (OCT) as high-resolution imaging modality yields transsectional images of tissue and can provide the missing depth information. Therefore, this paper deals with the tracking of distinctive subcutaneous structures on OCTs for automated control of ablation lasers in microsurgery. We present a ...
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  Mentions: University of Hannover
5. Development of a combined OCT-Raman probe for the prospective in vivo clinical melanoma skin cancer screening
  
  Explore aip.scitation.org Nov 15 2017 Dermatology
  
  A combined optical coherence tomography (OCT)-Raman probe was designed and built into a spectral domain OCT head, and its performance was evaluated and compared to the most common Raman probe setups, based on a fiber bundle and confocal free space optics. Due to the use of the full field of view of an OCT scanning lens, the combined probe has a superior performance within maximum permissible exposure limits, compared ...
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  Mentions: University of Hannover
6. Feature tracking for automated volume of interest stabilization on 4D-OCT images
  
  Explore Conference Proceedings Mar 16 2017
  
  A common representation of volumetric medical image data is the triplanar view (TV), in which the surgeon manually selects slices showing the anatomical structure of interest. In addition to common medical imaging such as MRI or computed tomography, recent advances in the field of optical coherence tomography (OCT) have enabled live processing and volumetric rendering of four-dimensional images of the human body. Due to the region of interest undergoing motion ...
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  Mentions: Robert A. Huber University of Lübeck University of Hannover
7. Experimental Visualization of Labyrinthine Structure with Optical Coherence Tomography
  
  Explore Iranian Journal of Otorhinolaryngology Dec 30 2016 Otolaryngology
  
  Introduction: Visualization of inner ear structures is a valuable strategy for researchers and clinicians working on hearing pathologies. Optical coherence tomography (OCT) is a high-resolution imaging technology which may be used for the visualization of tissues. In this experimental study we aimed to evaluate inner ear anatomy in well-prepared human labyrinthine bones. Materials and Methods: Three fresh human explanted temporal bones were trimmed, chemically decalcified with ethylenediaminetetraacetic acid (EDTA), and ...
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  Mentions: University of Hannover Omid Majdani
8. Comparative study of presurgical skin infiltration depth measurements of melanocytic lesions with OCT and high frequency ultrasound
  
  Explore Wiley Online Library Dec 23 2016 Dermatology , Oncology
  
  A reliable, fast, and non-invasive determination of melanoma thickness in vivo is highly desirable for clinical dermatology as it may facilitate the identification of surgical melanoma margins, determine if a sentinel node biopsy should be performed or not, and reduce the number of surgical interventions for patients. In this work, optical coherence tomography (OCT) and high frequency ultrasound (HFUS) are evaluated for quantitative in vivo preoperative assessment of the skin ...
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  Mentions: Universität Rostock University of Hannover
9. Simple model to simulate OCT-depth signal in weakly and strongly scattering homogeneous media
  
  Explore IOPscience Nov 5 2016
  
  We present a simple and efficient Monte Carlo model to predict the scattering coefficients and the influence of multiple photon scattering with increasing concentration of scattering centers from optical coherence tomography (OCT) data. While the model reliably estimates optical sample parameters for a broad range of concentrations, it does not require inclusion of more complex phenomena such as dependent scattering. Instead, it relies on a particular weighting function which is ...
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  Mentions: University of Hannover
10. Towards multimodal detection of melanoma thickness based on optical coherence tomography and optoacoustics
  
  Explore Conference Proceedings Mar 15 2016 Dermatology
  
  Melanoma skin cancer has one of the highest mortality rates of all types of cancer if not detected at an early stage. The survival rate is highly dependent on its penetration depth, which is commonly determined by histopathology. In this work, we aim at combining optical coherence tomography and optoacoustic as a non-invasive all-optical method to measure the penetration depth of melanoma. We present our recent achievements to setup a ...
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  Mentions: University of Hannover
11. Fast and automatic depth control of iterative bone ablation based on optical coherence tomography data
  
  Explore Conference Proceedings Jul 21 2015
  
  Laser surgery is an established clinical procedure in dental applications, soft tissue ablation, and ophthalmology. The presented experimental set-up for closed-loop control of laser bone ablation addresses a feedback system and enables safe ablation towards anatomical structures that usually would have high risk of damage. This study is based on combined working volumes of optical coherence tomography (OCT) and Er:YAG cutting laser. High level of automation in fast image ...
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  Mentions: University of Hannover
12. Retinal Layer Measurements After Successful Macula-off Retinal Detachment Repair using OCT
  
  Explore iovs.org Sep 6 2014 Ophthalmology
  
  Purpose: Optical coherence tomography (OCT) was used to analyze the thickness of various retinal layers of patients following successful macula-off retinal detachment (RD) repair. Methods: OCT scans of patients after successful macula-off RD repair were re-analyzed with a sub-segmentation algorithm to measure various retinal layers. Regression analysis was performed to correlate time after surgery with changes in layer thickness. In addition, patients were divided in two groups. Group 1 had ...
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  Mentions: Sebastian Wolf University of Bern University of Hannover
13. Normal distributions transform in multi-modal image registration of optical coherence tomography and computed tomography datasets
  
  Explore Conference Proceedings Apr 1 2014
  
  In recent years, optical coherence tomography (OCT) has gained increasing attention not only as an imaging device, but also as a navigation system for surgical interventions. This approach demands to register intraoperative OCT to pre-operative computed tomography (CT) data. In this study, we evaluate algorithms for multi-modal image registration of OCT and CT data of a human temporal bone specimen. We focus on similarity measures that are common in this ...
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  Mentions: University of Hannover Omid Majdani
14. In situ optical coherence tomography of percutaneous implant-tissue interfaces in a murine model
  
  Explore Home May 16 2013
  
  Novel surface coatings of percutaneous implants need to be tested in biocompatibility studies. The use of animal models for testing usually involves numerous lethal biopsies for the analysis of the implant-tissue interface. In this study, optical coherence tomography (OCT) was used to monitor the reaction of the skin to a percutaneous implant in an animal model of hairless but immunocompetent mice. In vivo optical biopsies with OCT were taken at ...
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  Mentions: Alexander Krüger University of Hannover Laser Zentrum Hannover
15. A one step vs. a multi step geometric calibration of an optical coherence tomography
  
  Explore Conference Proceedings Mar 18 2013
  
  This contribution compares two approaches for the geometric calibration of an optical coherence tomography (OCT) which forms part of a medical navigation system. For this purpose, a one step and a multi step calibration is performed with a self-produced 3D reference structure and a high-accurate 6 degrees of freedom (DoF) parallel robot, respectively. These 3D landmark-based geometric calibrations are based on the identification of a parameterized grey-box OCT model. We ...
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  Mentions: University of Hannover Hannover Medical School Omid Majdani
16. Towards a one step geometric calibration of an optical coherence tomography
  
  Explore Conference Proceedings Nov 24 2012
  
  This article presents a one step geometric calibration for an optical coherence tomography (OCT) which forms part of a medical navigation system. The 3D landmark-based geometric calibration with a self-produced 3D reference structure is based on the identification of a parameterized grey-box OCT model. We show in experimental results by comparing common measurement errors in the field of medical surgery before and after calibration, that the proposed methodology reduces systematic ...
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  Mentions: University of Hannover Omid Majdani
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