1. Articles from C. Simader

    1-5 of 5
    1. Comparison of penetration depth in choroidal imaging using swept source vs spectral domain optical coherence tomography

      Comparison of penetration depth in choroidal imaging using swept source vs spectral domain optical coherence tomography

      Purpose To compare signal penetration depth and deep structure-visualization of swept source (SS) and spectral domain (SD)-optical coherence tomography (OCT) with and without enhanced depth imaging (EDI) and B-scan averaging modes. Methods Volume scans were obtained from 20 eyes of healthy volunteers by DRI OCT-1, Spectralis using EDI and B-scan averaging, and Cirrus HD-OCT. The signal penetration depth was measured as the distance between the retinal pigment epithelium and the deepest visible anatomical structure at the foveal center. Visibility and contrast of the choroidoscleral junction and of vascular details within the choroid were assessed across the entire volume using ...

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    2. High-resolution optical coherence tomography to evaluate vitreomacular traction before and after membrane peeling.

      Related Articles [High-resolution optical coherence tomography to evaluate vitreomacular traction before and after membrane peeling.] Ophthalmologe. 2008 Mar 29; Authors: Georgopoulos M, Geitzenauer W, Ahlers C, Simader C, Scholda C, Schmidt-Erfurth U AIM: Morphological assessment of the vitreomacular interface and intraretinal architecture using three-dimensional high-resolution optical coherence tomography (HROCT) before and after surgical delamination of epiretinal membranes and the internal limiting membrane (ILM). METHOD: The extent and intensity of traction of the epiretinal membrane (ERM) and the morphology of the individual retinal layers were investigated preoperatively in 14 eyes of 14 patients using three-dimensional HROCT (Cirrus prototype, scanned area 6x6 ...

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    3. Three-dimensional optical coherence tomography for evaluating the retinal architecture before and after surgery for vitreomacular traction

      Zusammenfassung Ziel  Morphologische Untersuchungen der vitreomakulären Grenzschicht und der intraretinalen Architektur mittels dreidimensionaler hochauflösender Raster-OCT (optische Kohärenztomographie) vor und nach chirurgischer Delamination von epiretinalen Membranen und der Membrana limitans interna (ILM). Methoden  Bei 14 Augen von 14 Patienten wurden präoperativ die Ausdehnung und Intensität der Traktion der epiretinalen Membran (ERM) und die Morphologie der einzelnen Netzhautschichten mittels hochauflösendem Raster OCT (HROCT, Cirrus Prototyp, abgetastete Fläche 6×6 mm, 2 mm Dicke) dreidimensional dargestellt. Zusätzlich wurden Visus und ophthalmologischer Befund (inklusive Stratus-OCT) dokumentiert. Standardisierte Follow-up-Untersuchungen wurden prospektiv nach einem Protokoll am Tag 1 ...

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    4. Automatic segmentation in three-dimensional analysis of fibrovascular pigmentepithelial detachment using high-definition optical coherence tomography

      Background/aims:A limited number of scans compromise conventional optical coherence tomography (OCT) to track chorioretinal disease in its full extension. Failures in edge-detection algorithms falsify the results of retinal mapping even further. High-definition-OCT (HD-OCT) is based on raster scanning and was used to visualise the localisation and volume of intra- and sub-pigment-epithelial (RPE) changes in fibrovascular pigment epithelial detachments (fPED). Two different scanning patterns were evaluated.Methods:22 eyes with fPED were imaged using a frequency-domain, high-speed prototype of the CirrusTM HD-OCT. The axial resolution was 6 µm, and the scanning speed was 25 kA scans/s. Two different ...

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    5. Value of polarisation-sensitive optical coherence tomography in diseases affecting the retinal pigment epithelium

      Objectives:To evaluate pathological changes of retinal pigment epithelium (RPE) by polarisation-sensitive optical coherence tomography (PS-OCT).Methods:Forty-four eyes (22 patients) with significant pathologies of the RPE were evaluated using PS-OCT. A transversal scanning time domain OCT system was used for two-dimensional cross-sectional imaging of retinal polarisation properties.Results:The RPE scrambles the polarisation state of backscattered light (ie, acts as a depolarising layer), while the polarisation state of transmitted light is maintained. In patients with RPE pathologies irregularity, elevation, thickening or absence of the RPE is readily visualised by exploiting the depolarisation information. Polarisation scrambling in the sensory retina ...

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    1-5 of 5
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    Comparison of penetration depth in choroidal imaging using swept source vs spectral domain optical coherence tomography Postdoctoral Fellows/Research Scientists at University of Washington, Seattle Perimeter Medical Imaging AI Announces Publication of Peer-Reviewed Journal Article Validating Potential Use of Wide-Field Optical Coherence Tomography (WF-OCT) in Head and Neck Surgeries Association of retinal thickness and microvasculature with cognitive performance and brain volumes in elderly adults A Deep Learning Framework for the Detection and Quantification of Reticular Pseudodrusen and Drusen on Optical Coherence Tomography Quantitative assessment of textural features in the early detection of diabetic retinopathy with optical coherence tomography angiography Line-field confocal optical coherence tomography of fibroepithelioma of Pinkus Assessment of demineralized tooth lesions using optical coherence tomography and other state-of-the-art technologies: a review Optic disc and retinal vessel densities assessment by optical coherence tomography angiography in patients with keratoconus Optical coherence tomography angiography in Bietti crystalline dystrophy Choroidal vascularity profile in diabetic eyes using wide field optical coherence tomography Diagnostic accuracy of OCTA and OCT for myopic choroidal neovascularisation: a systematic review and meta-analysis