1. Julia Walther

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    1. Mentioned In 46 Articles

    2. Quality Assessment of Tympanoplasty by Means of Endoscopic Optical Coherence Tomography

      Quality Assessment of Tympanoplasty by Means of Endoscopic Optical Coherence Tomography
      Introduction: The endoscopic optical coherence tomography (eOCT) allows the direct, contactless representation and evaluation of the morphology and oscillation behaviour of the tympanic membrane and adjoining tympanic cavity content. After further development of the measuring technology, the eOCT will be able to be used in vivo for the assessment of tympanoplasty results. Materials and Methods: The eOCT was applied to 10 patients after a tympanoplasty with an intact ossicular chain ...
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    3. Endoscopic Optical Coherence Tomography in Diagnostics of Otosclerosis

      Endoscopic Optical Coherence Tomography in Diagnostics of Otosclerosis
      Introduction: Endoscopic Optical Coherence Tomography (eOCT) enables both high-resolution contact-free 3D-imaging of the tympanic membrane and spatial and frequency-resolved oscillation measurement via Doppler-OCT. Thus it is possible to detect causes of conduction hearing loss. In case of otosclerosis, changes in oscillation amplitude at the umbo had been showed via Laser-Doppler-Vibrometry. Material and Methods: The eOCT system utilizes a swept source laser with a wave length around 1300nm. Field-of-view and working ...
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    4. Endoscopic optical coherence tomography with wide field-of-view for the morphological and functional assessment of the human tympanic membrane

      Endoscopic optical coherence tomography with wide field-of-view for the morphological and functional assessment of the human tympanic membrane
      An endoscopic optical coherence tomography (OCT) system with a wide field-of-view of 8 mm is presented, which combines the image capability of endoscopic imaging at the middle ear with the advantages of functional OCT imaging, allowing a morphological and functional assessment of the human tympanic membrane. The endoscopic tube has a diameter of 3.5 mm and contains gradient-index optics for simultaneous forward-viewing OCT and video endoscopy. The endoscope allows ...
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    5. Visualization of interfacial adhesive defects at dental restorations with spectral domain and polarization sensitive optical coherence tomography

      Visualization of interfacial adhesive defects at dental restorations with spectral domain and polarization sensitive optical coherence tomography
      Restoration loss based on interfacial adhesive defects and associated caries at the restoration margin are the main causes for invasive replacement of dental restorations. Assessment of the interfacial quality based on clinical inspection and radiographic examination is often difficult and not reliable. In this work, we present spectral domain optical coherence tomography (SDOCT) and polarization sensitive optical coherence tomography (PSOCT) for the evaluation of tooth-composite bond failure. Imaging of two ...
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    6. Optical Coherence Tomography for NDE (Book Chapter)

      Optical Coherence Tomography for NDE (Book Chapter)
      Optical coherence tomography (OCT) is a noninvasive, high-resolution, interferometric imaging modality using near-infrared light to acquire cross sections and three-dimensional images of the subsurface microstructure of samples. Because of the rapid enhancement of OCT with respect to acquisition speed and axial resolution over the past years, OCT is becoming more and more attractive for applications in nondestructive testing and evaluation. In this chapter, a brief introduction to the technique and ...
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    7. A System for Clinical Use of Endoscopic Optical Coherence Tomography

      A System for Clinical Use of Endoscopic Optical Coherence Tomography
      Introduction: Optical Coherence Tomography (OCT) allows non-invasive high-resolution imaging of tissues. With a penetration depth of a few millimeters it's possible to image the tympanic membrane and the close-by part of the tympanum, e.g. for diagnostics of otitis media and middle ear effusion. In the field of in vivo examination there are difficulties in access to the human tympanic membrane due to the narrow and curved external ear ...
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    8. In vivo imaging in the oral cavity by endoscopic optical coherence tomography

      In vivo imaging in the oral cavity by endoscopic optical coherence tomography
      The common way to diagnose hard and soft tissue irregularities in the oral cavity is initially the visual inspection by an experienced dentist followed by further medical examinations, such as radiological imaging and/or histopathological investigation. For the diagnosis of oral hard and soft tissues, the detection of early transformations is mostly hampered by poor visual access, low specificity of the diagnosis techniques, and/or limited feasibility of frequent screenings ...
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    9. Detection of carious lesions utilizing depolarization imaging by polarization sensitive optical coherence tomography

      Detection of carious lesions utilizing depolarization imaging by polarization sensitive optical coherence tomography
      As dental caries is one of the most common diseases, the early and noninvasive detection of carious lesions plays an important role in public health care. Optical coherence tomography (OCT) with its ability of depth-resolved, high-resolution, noninvasive, fast imaging has been previously recognized as a promising tool in dentistry. Additionally, polarization sensitive imaging provides quantitative measures on the birefringent tissue properties and can be utilized for imaging dental tissue, especially ...
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    10. In vivo imaging of human oral hard and soft tissues by polarization-sensitive optical coherence tomography

      In vivo imaging of human oral hard and soft tissues by polarization-sensitive optical coherence tomography
      Since optical coherence tomography (OCT) provides three-dimensional high-resolution images of biological tissue, the benefit of polarization contrast in the field of dentistry is highlighted in this study. Polarization-sensitive OCT (PS OCT) with phase-sensitive recording is used for imaging dental and mucosal tissues in the human oral cavity in vivo . An enhanced polarization contrast of oral structures is reached by analyzing the signals of the co- and crosspolarized channels of the ...
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    11. Flow Measurement by Lateral Resonant Doppler Optical Coherence Tomography in the Spectral Domain

      Flow Measurement by Lateral Resonant Doppler Optical Coherence Tomography in the Spectral Domain
      In spectral domain optical coherence tomography (SD-OCT), any transverse motion component of a detected obliquely moving sample results in a nonlinear relationship between the Doppler phase shift and the axial sample velocity restricting phase-resolved Doppler OCT (PR-DOCT). The size of the deviation from the linear relation depends on the amount of the transverse velocity component, given by the Doppler angle, and the height of the absolute sample velocity. Especially for ...
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    12. Impact of a detector dead time in phase-resolved Doppler analysis using spectral domain optical coherence tomography

      Impact of a detector dead time in phase-resolved Doppler analysis using spectral domain optical coherence tomography
      For any oblique sample movement containing a transverse velocity component, the commonly used linear relationship between the phase shift and the axial velocity component is erroneous for spectrometer-based optical coherence tomography (spectral domain OCT, SD-OCT). We recently proposed a new Doppler model that assumes a continuous integration of the photocurrent. In this research, we extend the model for detectors with a shutter control by taking detector dead time into account ...
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    13. Optimal processing of Doppler signals in OCT

      Optimal processing of Doppler signals in OCT
      Besides structural imaging, OCT can be used to estimate axial velocities of the sample resolved in depth by Doppler processing. In Fourier domain OCT (FD-OCT), this is accomplished by measuring the phase difference (i.e. phase shift) between timely separated A-scans at the same depth. In most cases, these data are disturbed by noise caused by intrinsic noise of the OCT system, specified by the SNR, and decorrelation noise caused ...
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    14. Imaging the tympanic membrane oscillation ex vivo with Doppler optical coherence tomography during simulated Eustachian catarrh

      Imaging the tympanic membrane oscillation ex vivo with Doppler optical coherence tomography during simulated Eustachian catarrh
      Recently, optical coherence tomography (OCT) was utilized in multiple studies for structural and functional imaging of the middle ear and the tympanic membrane. Since Doppler OCT allows both, the spatially resolved measurement of the tympanic membrane oscillation and high-resolution imaging, it is regarded as a promising tool for future in vivo applications. In this study, Doppler OCT is utilized for the visualization of the tympanic membrane oscillation in temporal bones ...
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  2. About Julia Walther

    Julia Walther is at the Technical University of Dresden in Germany.