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 194 for “"imaging modality"”.
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CONTRAST-ENHANCED MAMMOGRAPHY: THE EMERGENT CONTRAST-ENHANCED BREAST IMAGING MODALITY
… graded according to 2022 CEM-dedicated Breast Imaging Reporting and Data System (BI-RADS) lexicon, is associated with breast density, menstrual status, and age. Methods: This bi-centric retrospective analysis included CEM examinations performed for second-level assessment of suspicious …
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A High-Resolution Microscopic Electrical Impedance Imaging Modality: Scanning Impedance Imaging
Electrical impedance imaging is an imaging technique which has the capability of revealing the spatial distribution of the electrical impedance inside biological tissues. Classical electrical impedance imaging including Electrical Impedance Tomography (EIT) typically has low resolution. Advances in …
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Development of a Multispectral VIS-SWIR Imaging Modality for Cutaneous Water Assessment
… hallmark of inflammation. Diffuse reflectance imaging in the short-wave infrared (SWIR) spectrum is an effective method for quantitatively mapping relative cutaneous fluid content. Unlike the visible and near infrared spectra, the SWIR spectrum exhibits strong water absorption and relatively …
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IMAGING SPECIFIC ABSORPTION RATE WITH MR THERMOMETRY USING PARAMAGNETIC LANTHANIDE COMPLEXES AND IN VIVO GABA MR SPECTROSCOPY IN MOVEMENT DISORDERS
Magnetic Resonance Imaging (MRI) is a popular imaging modality due to its ability to provide excellent soft tissue contrast without exposure to ionizing radiation. It can be used for temperature monitoring (thermometry) as well as for assessing the biochemistry in vivo (MRS). This dissertation …
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Collimator width Optimization in X-ray Luminescent Computed Tomography
… Luminescent Computed Tomography (XLCT) is a new imaging modality which is under extensive trials at present. The modality works by selective excitation of X-ray sensitive nanophosphors and detecting the optical signal thus generated. This system can be used towards recreating high quality …
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Reference intervals for the echocardiographic measurements of the right heart in African school children and adolescents
Echocardiography is the primary imaging modality for the diagnosis and management of right ventricular (RV) failure.[2-5] Besides aiding in the diagnosis and management of conditions such as arrhythmogenic right ventricular cardiomyopathy, pulmonary embolism, and RV infarction, the …
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Machine Learning in Inverse Problems - Learning Regularisation Functionals and Operator Corrections
… combining knowledge and modelling of the imaging modality at hand with a regularisation functional that incorporates prior knowledge about solutions to the inverse problem. With the success of deep neural networks in many imaging tasks such as image classification or semantic segmentation, …
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Robust and efficient methods for proton computed tomography.
… computed tomography (pCT) is a recent promising imaging modality with the goal of generating accurate 3D maps of relative stopping power (RSP) with respect to water. Since the early developments of this imaging technique in 1970's, there have been significant improvements regarding the …
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Dynamic Digital Optical Tomography for Cancer Imaging and Therapy Monitoring
Diffuse optical tomography is a non-invasive imaging technique that uses near-infrared light to create three-dimensional images of tissue. This dissertation presents the design and validation of an instrument for rapid optical imaging using digital detection techniques. In addition to a detailed …
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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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Intravascular Optical Coherence Tomography Image Analysis
… Tomography (IVOCT), a high resolution (10-20µm) imaging modality that performs cross-sectional imaging of coronary arteries by measuring echoes of backscattered light, is rapidly becoming a promising imaging modality for diagnosis of CAD. Compared to alternative technologies such as intravascular …
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Algorithmic techniques for manual-scanning and multi-sensory representation of optical coherence tomography data
… tomography (OCT) is an emerging biomedical imaging modality that interferometrically measures the depth-resolved back-scattered light from a sample. The high resolution subsurface imaging capabilities of OCT can potentially provide valuable diagnostic feedback about tissue morphology during …
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Integrated Real-Time Control And Processing Systems For Multi-Channel Near-Infrared Spectroscopy Based Brain Computer Interfaces
… (Soraghan, 2010). Using a comparable functional imaging modality the assumptions on which NIRS-BCI have been reassessed, with regard to cognitive task selection, active area locations and lateralized motor cortex activation separability. This dissertation will also present methods that have been …
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LisNRs : a novel class of liposomal contrast agents for molecular MRI
… models of biological function. Molecular imaging, a technique that employs chemical probes to relay molecular events into spatially-resolved signal changes, is a promising strategy for studying complex molecular signaling networks in situ. Magnetic resonance imaging (MRI) is a leading …
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Ricketts Analysis Using Conventional and DolphinTM Generated CBCT Lateral Cephs
… on the radiographic phantom to compare each imaging modality. Twenty-five lateral cephalometric radiographs were selected retrospectively from the records of patients of the LLUSD Graduate Orthodontic Clinic who had both CBCT and Sirona digital lateral cephalograms. Radiographs were excluded …
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Dose and image quality considerations in computed tomography
The increased use of Computed Tomography as an imaging modality is of concern because of the growing body of evidence linking radiation exposure to cancer incidence. However, a framework does not yet exist for balancing the immediate needs of the clinical task (image quality) with future risks due …
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On Improving the Acquisition and Reconstruction Of Spatio-Temporal Magnetic Resonance Imaging
Magnetic Resonance Imaging (MRI) is a non-invasive but slow imaging modality that provides unparalleled flexibility in acquiring multiple forms of soft-tissue contrast. Recently, there has been a lot of interest in mapping the inherent magnetization properties of the underlying human tissue and in …
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Rapid time-resolved brain imaging with multiple clinical contrasts using wave-shuffling
Magnetic Resonance Imaging (MRI) is a non-invasive but slow biomedical imaging modality that produces images of multiple desirable contrasts. Currently, multiple receive channels are used in MRI to exploit redundancy and sample fewer data points for faster acquisition. Wave-CAIPI is a recently …
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Analytical Modeling of Optical Coherence Tomography
… Tomography (OCT) has become an indispensable imaging modality in ophthalmology and dermatology, prized for its micrometer-level resolution, non-invasiveness, and significant penetration depth. Despite its precision in revealing skin morphology, standard OCT lacks the ability to help …
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Investigation of Machine-Learning Techniques for Pulmonary Artery Pressure Estimation from Electrical Impedance Tomography Images
… of PAP using a continuous and non-invasive imaging modality - electrical impedance tomography (EIT). Previous work used a model-based algorithm relying on the known association between thoracic conductivity changes and PAP. This thesis attempted to improve these results by predicting PAP …
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