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 42 for “"OCT imaging"”.
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En face OCT imaging for the assessment of glaucoma
… and demands early and accurate diagnosis. OCT has become a key investigative technique in glaucoma, and, although it provides invaluable clinical support, detection of early glaucoma remains imperfect. Recent OCT developments enabled direct assessment of retinal nerve fibre bundle (RNFB) …
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Design Of A Dynamic Focusing Microscope Objective For Oct Imaging
Optical Coherence Tomography (OCT) is a novel optical imaging technique that has assumed significant importance in bio-medical imaging in the last two decades because it is non-invasive and provides accurate, high resolution images of three dimensional cross-sections of body tissue, exceeding the …
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Point-Spread Function Assessment of SG-DBR Based Swept Source for OCT Imaging
<p> Swept Source Optical Coherence Tomography (SS-OCT) is a medical imaging technique that requires high repetition rate, widely-tunable coherent laser sources. Sampled grating distributed Bragg reflector (SG-DBR) lasers are proven in telecom applications and are expected to fulfill the …
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Catheter for endoscopic magnetomotive optical coherence tomography
… magnetomotive optical coherence tomography (MM-OCT). Magnetomotive optical coherence tomography is a novel technique which uses targeted magnetic contrast agents for contrast enhancement of OCT imaging. In MM-OCT, microspheres and magnetic nanoparticles (MNPs) are introduced into tissue and an …
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Endovascular Optical Coherence Tomography Imaging in Cerebrovascular Disease
… Endovascular optical coherence tomography (OCT) is the highest resolution intravascular imaging modality available, utilizing near-infrared light with a wavelength of approximately 1300 nm and excellent spatial resolution of 10µm is achievable. With near histologic resolution, OCT has been …
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Applications of Fourier Domain Mode Locked lasers for optical coherence tomography imaging
Optical coherence tomography (OCT) is a micrometer-resolution imaging technique that produces cross-sectional images of sample microstructure by measuring the amplitude and echo time delay of backscattered light. OCT imaging is performed using low-coherence interferometry, typically with a fiber …
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Endoscopic optical coherence tomography for clinical studies in the gastrointestinal tract
Optical coherence tomography (OCT) performs micrometer-scale, cross-sectional and three dimensional imaging by measuring the echo time delay of backscattered light. OCT imaging is performed using low-coherence interferometry. With the development of Fourier domain detection techniques and …
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Spectral/ Fourier domain Doppler Optical Coherence Tomography in the rodent retina
Optical Coherence Tomography (OCT) is an emerging imaging technique based on low-coherence interferometry for noninvasive, high- resolution, cross-sectional imaging in a variety of biomedical fields. In ophthalmology, OCT has rapidly become a standard clinical diagnostic tool for retinal diseases, …
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Development of Optical Coherence Tomography Systems for Ophthalmic Imaging and Intrasurgical Guidance
… structure. </p><p>Optical coherence tomography (OCT) is a non-contact volumetric imaging modality that is well suited to image the anterior and posterior human eye in vivo. The success of OCT in clinical ophthalmology motivated the development of intraoperative OCT to overcome the limitations of …
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Digital signal processing techniques for optical coherence tomography : OCT and OCT image enhancement
… resolution optical coherence tomography (OCT) systems. To reduce the dependence of OCT research systems on fixed analog electronics and to improve overall system flexibility, a digital demodulation scheme implemented entirely in software was developed. This improvement allowed rapid …
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Ultrahigh speed optical coherence tomography for ophthalmic imaging applications
Optical coherence tomography (OCT) is a non-contact, non-invasive, micron-scale optical imaging technology that has become a standard clinical tool in ophthalmology. Fourier domain OCT detection methods have enabled higher sensitivity and imaging speeds compared to previous generation timedomain …
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Advances in the endoscopic management of esophageal neoplasia using ultrahigh speed endoscopic optical coherence tomography
… error. Endoscopic optical coherence tomography (OCT) is a unique imaging technique that can provide micrometer scale, two- and three-dimensional imaging of esophageal tissue without requiring exogenous contrast agents. Although various studies have investigated the feasibility of endoscopic OCT …
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High resolution imaging of neoplasma using optical coherence tomography
Diagnostic imaging technologies for the detection of cancer include CT, MRI, ultrasonography, and endoscopy. However, many early neoplastic changes remain beyond their detection limits. A modality capable of imaging at or near the cellular level could detect disease at earlier stages than currently …
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Diagnostic and therapeutic devices and applications of endoscopic optical coherence tomography
… With the maturation of sweptsource lasers, OCT technology has undergone major advancements over the last few years. Swept-source laser sources based on Fourier domain mode locking (FDML), akinetic and vertical cavity surface emitting laser (VCSEL) technologies have shown to reach and exceed …
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Optical coherence tomography applied to investigations of optical properties of paintings
Optical Coherence Tomography (OCT), a fast 3D scanning Michelson interferometer normally applied to biomedical applications has recently been applied to art related subjects. In this thesis, the various applications of OCT to the non invasive imaging of paintings are explored in detail. The …
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Ultrahigh resolution optical coherence tomography for the detection of early stage neoplastic pathologies
… existing diagnostic modalities, including x-ray imaging, magnetic resonance imaging, ultrasound, and endoscopy do not have sufficient resolution to detect changes in architectural morphology associated with early neoplasia and other pathologies. Diagnostic modalities capable of identifying …
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RF test methods for balanced receivers for swept source optical coherence tomography
Optical coherence tomography (OCT) has risen as a clinical standard of diagnosis and management of ocular diseases since its development in 1991 by the MIT group and the collaborators. Since current cutting-edge OCT technology based on frequency-swept lasers has achieved scanning rate over …
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Development of Novel Instrumentations and Algorithms for Optical Screening of Epithelial Dysplasia
… limiting factor of using fiber bundles for a/LCI imaging, as these fiber bundles are fragile, expensive, and exhibits low optical throughput. The technique was validated using microsphere phantoms, and showed excellent agreement with the actual size. This technique was also insensible to the …
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Magnetomotive dynamics of magnetic particles for optical imaging contrast and elastography
… magnetomotion is exploited for enhancing optical imaging contrast and elastography using optical coherence tomography (OCT). A combination of simulations and experiments were performed to study the spatial and temporal characteristics of the magnetomotive (MM) response under dynamic excitation. …
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Non-invasive optical quantification of otitis media and middle ear effusions
… recent applications of non-invasive optical imaging in the middle ear. A clinical study was organized to observe the tympanic membrane of patients with normal, acute, and chronic infections in an attempt to identify differentiating characteristics of each infection state. Following this work, …
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