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 218 for “"imaging modalities"”.
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Taming unstable inverse problems: Mathematical routes toward high-resolution medical imaging modalities
… motivations that come from the field of medical imaging. The first part consists in the analysis of an inverse problem involving the Boltzmann transport equation, with applications in Optical Tomography. There we investigate the reconstruction of the spatially-dependent part of the scattering …
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Nuclear and Molecular Imaging Modalities for Predicting Calcific Aortic Valve Disease Progression in Animal Models
… shown to serve as an attractive molecular imaging target.1–3 The primary objective of this study is to assess the feasibility of detecting biomarkers of CAVD by various in vivo imaging modalities, such as PET and echocardiography. In addition, this study assesses disease progression in …
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A comparison of imaging modalities and decoding methods for detecting semantic information in the brain
… (ECoG) and 7 tesla functional magnetic resonance imaging (7T-fMRI) to detect semantic representations; and (3) to evaluate the strengths and limitations of multivariate analysis methods, in particular methods based on regularised regression, for revealing properties of semantic representations. In …
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The role of PET/CT in the differential diagnosis of thymic tumors: a retrospective case series and comparative literature review with other imaging modalities
Ο ακριβής προεγχειρητικός χαρακτηρισμός των θυμικών επιθηλιακών όγκων διαδραματίζει καθοριστικό ρόλο στη λήψη θεραπευτικών αποφάσεων, καθώς τόσο ο ιστολογικός υπότυπος όσο και η ανατομική έκταση της νόσου καθορίζουν τον χειρουργικό σχεδιασμό και τις επιλογές της συστηματικής θεραπείας. Ωστόσο, τα …
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Methodology for quantitative assessment of perfusion in porcine model of peripheral arterial disease
… review recent advancements made in perfusion imaging modalities by providing detailed information about the methods and metrics used for PAD diagnosis and treatment. In the second part, I will describe a revised protocol for applying the gold-standard method for 3D perfusion quantification and …
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Spatiotemporal brain imaging and modeling
… behavioral tasks. Advanced noninvasive medical imaging modalities are able to locate brain activities at high spatial and temporal resolutions. Quantitative modeling of these data is needed to understand how large-scale distributed neuronal interactions underlying perceptual, cognitive, and …
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Influence of Mandibular Fixed Retainers on Diagnostic Quality of Cranial MRI
… potentially undergo routine magnetic resonance imaging. Ten subjects had impressions taken and models made for retainer tray fabrication. Removable trays with each lingual retainer material incorporated in them were fabricated from the models. Subjects underwent scans with each of the five test …
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MOBILE, HYBRID COMPTON/CODED APERTURE IMAGING FOR DETECTION, IDENTIFICATION AND LOCALIZATION OF GAMMA-RAY SOURCES AT STAND-OFF DISTANCES
… truck-based, hybrid gamma-ray spectroscopic and imaging system able to quickly detect, identify and localize, radiation sources at standoff distances through improved sensitivity provided by multiple detection modes while minimizing the false alarm rate. Reconstruction of gamma-ray sources is …
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Absolute electrical impedance tomography and spectroscopy: an Orthogonal Chirp Division Multiplexed (OCDM) approach
… and Spectroscopy (aEITS) is a non-intrusive imaging technique, that reconstructs images based on estimates of the absolute internal impedance distribution of an object. However, without the availability of a reference frame, it suffers from poor image quality when general assumptions are used …
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Optimizing registration of complex vascular geometries
Advances in imaging, such as coronary angiography, intravascular ultrasound, and optical coherence tomography, can improve procedural success and outcomes for endovascular catheter intervention, such as stent implantation. Yet, these imaging modalities are not universally embraced; and thus, …
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Imaging Based Models to Improve Lung Cancer Diagnosis
… applications of machine learning to medical imaging. In this work, we seek to better understand lung cancer through the computer vision tasks of risk prediction, localization, and incorporating image priors across the clinical imaging modalities of chest radiographs and computed tomography …
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TACTILE AND MULTISPECTRAL BIMODAL IMAGING FOR BREAST CANCER RISK ASSESSMENT
… breast tumors and tissue using non-invasive imaging modalities. The proposed bimodal imaging system has tactile and multispectral imaging capabilities. Tactile imaging modality characterizes tumors by esti-mating their depth, size, and stiffness, along with the Tactile Index. Multispectral …
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Development and Implementation of Fully 3D Statistical Image Reconstruction Algorithms for Helical CT and Half-Ring PET Insert System
… tomography: PET) have become widely used imaging modalities for screening, diagnosis, and image-guided treatment planning. Along with the increased clinical use are increased demands for high image quality with reduced ionizing radiation dose to the patient. Despite their significantly …
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Comparison of Digital and CBCT Synthesized Lateral Cephalograms
… dimensions and compared across the different imaging modalities. In Group 1, forty patients were randomly selected from the Loma Linda University Graduate Orthodontic Clinic who had both a NewTom synthesized lateral cephalogram and a Sirona digital lateral cephalogram. In Group 2, forty …
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Positron Emission Tomography in Oncology and Environmental Science
… has played witness to the onset of molecular imaging for the clinical assessment of physiological targets. While several medical imaging modalities allow for the visualization of the functional and anatomical properties of humans and living systems, few offer accurate quantitation and the …
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Retrieving Information from Scattered Photons in Medical Imaging
In many medical imaging modalities, as photons travel from the emission source to the detector, they are scattered by the biological tissue. Often this scatter is viewed as a phenomenon that degrades image quality, and most research is focused on designing methods for either discarding the …
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Recognizing Brain Regions in 2D Images from Brain Tissue
Often, the first step in neuroimaging research is understanding which anatomical structures are present in an image. Structural MRI provides a clear, high-resolution visualization of the anatomy of the brain, capturing physical characteristics like the size and shape of different regions of the …
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Surface plasmon enhanced fluorescence for biological imaging : from visible to short-wave infrared
Fluorescence imaging offers high spatio-temporal resolution, low radiation dosage exposure, and low cost among all the available imaging modalities, for example, magnetic resonance imaging, computerized tomography and positron emission tomography. Imaging probes of high emissivity and …
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