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 25 for “"Intravascular Ultrasound"”.
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LUMEN SEGMENTATION IN INTRAVASCULAR ULTRASOUND DATA
Intravascular ultrasound (IVUS) is a catheter-based medical imaging technique that is capable of producing high resolution cross-sectional images of interior of blood vessels and it is currently the gold standard technique for the study of the characteristics of the atherosclerotic plaques. …
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Unsupervised Representation Learning from Intravascular Ultrasound Videos
… cause of mortality and morbidity worldwide. Intravascular Ultrasound (IVUS) is an imaging technology that has the distinctive ability to offer real-time endovascular information of the coronary vasculature. However, its low signal-to-noise ratio, low data availability, and numerous artifacts …
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Multi-Frequency Processing for Lumen Enhancement with Wideband Intravascular Ultrasound
The application of high frequency ultrasound is the key to higher resolution intravascular ultrasound (IVUS) images. The need to further improve the IVUS spatial resolution may drive the transducer center frequency even higher than the current 40 MHz range. However, increasing the center frequency …
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AI in the Cath Lab: Implications of Clinical AI-Enabled Assistance for Intravascular Ultrasound Procedures
… decision-making and task completion time of intravascular ultrasound (IVUS) workflows for coronary procedures. It is based on an experiment that was conducted with the support of Boston Scientific, where engineers have recently developed an exploratory AI model for annotating IVUS images as …
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Geo-UNet: A Geometrically Constrained Neural Framework for Clinical-Grade Lumen Segmentation in Intravascular Ultrasound
Precisely estimating lumen boundaries in intravascular ultrasound (IVUS) is needed for sizing interventional stents to treat deep vein thrombosis (DVT). Unfortunately, current segmentation networks like the UNet lack the precision required for clinical adoption in IVUS workflows. This arises due to …
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Relationship Between Intravascular Ultrasound Parameters and Fractional Flow Reserve in Intermediate Coronary Artery Stenosis of Left Anterior Descending Artery
… study was to assess the relationship between intravascular ultrasound (IVUS) parameters, including volumetric analysis, and fractional flow reserve (FFR). METHODS: Both IVUS and FFR were performed in 206 cases of intermediate stenosis of the left anterior descending artery (LAD). Myocardial …
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The relationship between intravascular ultrasound-derived percent total atheroma volume and fractional flow reserve in the intermediate stenosis of proximal or middle left anterior descending coronary artery
… extent of the conductive vessel (expressed as Intravascular ultrasound [IVUS]-derived percent total atheroma volume [%TAV]), correlates with functional severity of intermediate stenosis of left anterior descending artery (LAD). An IVUS study and fractional flow reserve (FFR) measurements …
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Arterial Calcification and the Clinical Implications on Stent Function
… with meshes inferred from patient specific intravascular ultrasound (IVUS) data, which defined the histological disease condition of the arteries. Combined with stent modeling, this platform is targeted at the development of virtual evaluation of stent performance in a specific arterial …
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Ultrasonic Characterization of Human Coronary Arteries and Atherosclerotic Plaques
… investigating the physics of the interaction of ultrasound with normal and pathological coronary artery tissues are described in this dissertation. Ultrasound is a modality capable of visualizing and characterizing the lesions that define atherosclerosis. A better understanding of the physics …
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Magnetic Resonance Imaging in Paediatric Coronary Vasculopathy
… ability to detect intimal disease in CAV, using intravascular ultrasound to validate the findings. Finally, MRI was used to study the potential of aortic screening for rapid assessment of CAV.Results MRI coronary artery lumen imaging is feasible in children and reference values are provided. …
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Biomechanical and morphological characterization of common iliac vein remodeling: Effects of venous reflux and hypertension
… inflation-extension protocol in conjunction with intravascular ultrasound (IVUS) was utilized to investigate the passive biomechanical response of both control common iliac veins (from 9 dogs) and common iliac veins subjected to chronic venous reflux and hypertension (from 9 dogs). The change in …
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Attachment mechanisms of a novel, targeted, lipid-based, ultrasound contrast agent
… of a novel, targeted, lipid-based, microbubble ultrasound contrast agent (UCA) for assessment of coronary heart disease (CHD) with high frequency intravascular ultrasound (IVUS). The targeting mechanisms assessed for microbubble attachment include a streptavidin-biotin mechanism, electrostatic …
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The Relationship Between Volumetric Plaque Components and Classical Cardiovascular Risk Factors and the Metabolic Syndrome
… syndrome (MS) by using virtual histology-intravascular ultrasound (VH-IVUS). Background: It remains unclear how the cardiovascular risk factors correlate with the histological components of coronary plaques. Methods: “Whole vessel” VH-IVUS analysis was performed in 189 vessels of 63 …
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Optimizing registration of complex vascular geometries
… 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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Intravascular Optical Coherence Tomography Image Analysis
… of atherosclerotic plaques inside the arteries. Intravascular Optical Coherence 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 …
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Characteristics of blood vessel wall and atherosclerosis using high frequency ultrasound signals
… many techniques like electrocardiogram, x-rays, ultrasound, electroencephalogram, computed tomography and magnetic resonance imaging use signal and image processing techniques to determine the physical and biological properties of the tissues and organs. The underlying principle in signal …
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Multi-modality Imaging to Determine the Role of Calcification and Inflammation on Restenosis Rates Following Lower Limb Angioplasty
… imaging (NIRF-OCT) and plaque burden assessed by intravascular ultrasound (IVUS), in the experimental arm (EA). 40 patients were used for formal analysis. 14 patients (35%) reached the primary outcome of restenosis. Pre-PTA TBRmax in the restenosis group for 18F-FDG (2.43 [IQR 2.29 – 2.61] and …
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hs-CRP level represents the disease burden and the age but not vulnerability of coronary atherosclerosis
… we performed ‘whole vessel” virtual histology-intravascular ultrasound (VH-IVUS) in 189 vessels of 63 patients. The components of atherosclerosis were classified as fibrous (FI), fibrous-fatty (FF), necrotic core (NC) and dense calcium (DC). Quantitative assessment of these plaque components …
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Echogenic Liposomes For Nitric Oxide Delivery and Breast Cancer Treatment
… gas to enhance acoustic reflectivity in ultrasound and are used as a contrast agent. The innovative part of this study is based on a novel concept to encapsulate nitric oxide (NO) gas into ELIP, deliver it to breast cancer cells, and control its release via direct ultrasound exposure. …
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Molecular imaging of calcification and inflammation in aortic valve disease and atherosclerosis
… were associated with more high-risk features on intravascular ultrasound than those without uptake. In the carotid cohort, 38 volunteers were recruited (26 +12, separate studies). 18F-fluoride plaque uptake was associated with neurovascular symptoms (log10 mean standardized uptake value 0.29±0.10 …
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