Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 23 for “"endoscopes"”.
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Novel Optical Endoscopes for Early Cancer Diagnosis and Therapy
… were focused on the development of flexible endoscopes for detection of dysplasia in Barrett’s oesophagus. To enable molecular imaging with a newly discovered targeted fluorescent contrast agent, a bimodal endoscope capable of capturing NIR fluorescence and white light reflectance was …
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Novel endoscopes for microscopic assessment of airway clearance using micro-optical coherence tomography
… was incorporated into miniaturized common-path endoscopes and mucociliary transport was visualized in vivo for the first time. The first-generation Micro-OCT probe had a rigid design with outer diameter of 4 mm and a two-prism configuration providing beam splitting and sample beam shaping into …
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Development of small-diameter endoscope capable of high-resolution visualization and laser therapy through a shared optical aperture
… small diameter of currently available endoscopes, which is the result of illumination, visualization, and phototherapy functions each requiring a unique, adjacent, optical aperture. Furthermore, some MIS procedures in common practice could realize better outcomes with smaller diameter …
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Multiphoton Endoscopy
… standard histopathology. Therefore, multiphoton endoscopes (MPEs) that enter the body via a natural orifice or a small surgical incision and are capable of providing real-time, cellular level images from unstained tissues would be valuable clinical tools. These endoscopes could be used clinically …
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Investigation of Endoscopic Techniques for Flow and Combustion Measurements
… work investigated the application of fiber-based endoscopes (FBEs) in combustion and flow measurements, especially for multidimensional and quantitative measurements. The use of FBEs offers several unique advantages to greatly reduce the implementation difficulty and cost of optical diagnostics. …
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Design of a wireless ureteropyeloscope
… after currently existing instruments. Current endoscopes use fibre-optics for lighting area of interest as well as image acquisition. However, the ureteropyeloscope discussed was developed with a camera at the distal end of the insertion tube as its image acquisition system. The images captured …
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Minimally invasive diagnostic imaging using high resolution Optical Coherence Tomography
… In combination with small fiber-optic catheters, endoscopes, and other imaging devices, minimally invasive OCT imaging was carried out with novel diagnostic devices also developed in this work. The development and implementation of advanced OCT systems for both research and clinical applications …
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Design of an endoscopic 3-D Particle-Tracking Velocimetry system and its application in flow measurements within a gravel layer
… gravel layer is developed. Two fiberoptic endoscopes are used in a stereoscopic arrangement to acquire image sequences of the flow field within a single gravel pore. The images are processed by a 3-D Particle-Tracking Velocimetry (3-D PTV) algorithm, which yields the three-dimensional …
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Advanced fibre-based endoscopy for biophotonics applications
… with footprints far bellow those of conventional endoscopes, as well as enhanced spatial resolution up to the diffraction limit de-termined by the numerical aperture (NA) of the fibre.<br/><br/>In this Thesis, high-resolution focussing is demonstrated with unprecedented ability across novel …
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Holographic Control of Light Propagation in Optical Waveguides
… of faster communication technologies, ultra-thin endoscopes and holographically enhanced sensors. An experimental system is established that allows light coupling into the proximal facet of the optical waveguide to be controlled. Light exiting the waveguide at the distal facet is imaged using an …
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Accelerated fibre microendoscopy techniques for in-vivo applications
… ultra-narrow imaging tool. Compared to current endoscopes based on GRIN lenses or fibre bundles, this concept offers a footprint reduction exceeding an order of magnitude, together with a significant enhancement in resolution.<br/><br/>This thesis represents one of the first attempts to move …
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Imaging through optical multimode fiber: towards ultra-thin endoscopy
… method for implementing flexible MMF-based endoscopes by exploiting the waveguide physics and numerical optimization.
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High resolution imaging of neoplasma using optical coherence tomography
… a wide range of clinical instruments including endoscopes, catheters, laparascopes, and surgical probes. A role for OCT is envisioned in clinical scenarios such as the follow-up management of patients with cervical intraepithelial neoplasia, on tamoxifen, with gastro-esophageal reflux or …
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Ultrahigh-Resolution Endoscopic Optical Coherence Tomography for In Vivo Mouse Colonoscopy
… tomograms collected with the two endoscopes presented.
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Spectrally Resolved Detector Arrays for Multiplexed Biomedical Fluorescence Imaging
… and predict the imaging performance of spectral endoscopes were developed. With the endoscope we demonstrated simultaneous imaging and spectral unmixing of chemically oxy/deoxygenated blood and three fluorescent dyes in a tissue mimicking phantom, and of two fluorescent dyes in an ex vivo …
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Endoscopic optical coherence tomography for clinical studies in the gastrointestinal tract
… detection techniques and fiber-optic based OCT endoscopes, high speed internal body imaging was enabled, which makes OCT suitable for clinical research in the human gastrointestinal (GI) tract. Endoscopic OCT imaging is challenging because fast and stable optical scanning must be implemented …
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Design and Development of a Minimally Invasive Endoscope: Highly Flexible Stem with Large Deflection and Stiffenable Exoskeleton Structure
… little is known about how sharp and forceful endoscopes can be without accidentally cutting into tissue during navigation. In order to solve the requirements of stiffness (to support tools) and flexibility (to navigate turns), we expanded on a design by Zehel et al. [49], who proposed …
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Slaugytojo vaidmuo pacientui atliekant endoskopines intervencijas /
… preparation for the procedure, disinfection of endoscopes, sterilisation of tools, assisting the doctor during the procedure, ensuring patient safety and comfort, monitoring the patient after the procedure. The nurse's role is crucial for both the physician and the patient. 2. The preparation in …
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The Detection of Gastrointestinal Inflammation with Microultrasound and The Feasibility of Ultrasound Capsule Endoscopy
… improvements can be met by augmenting capsule endoscopes with microultrasound. Microultrasound (µUS) frequencies are > 20 MHz and have the potential to provide highly detailed transmural images of the bowel wall. This would provide capsule endoscopes with a means of detecting and displaying …
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Development of Multi-perspective Diagnostics and Analysis Algorithms with Applications to Subsonic and Supersonic Combustors
… diagnostics and the use of fiber-based endoscopes (FBEs) for non-intrusive and multi-perspective chemiluminescence imaging up to 20 kHz. Non-intrusive and full-field imaging measurements provide a wealth of information for model validation and design optimization of propulsion systems. …
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