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 20 for “"CT angiography"”.
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A retrospective study of CT angiography versus digital subtraction angiography in penetrating neck trauma
… data validating the use of Computed Tomography Angiography (CTA) in the evaluation of penetrating neck trauma. OBJECTIVES. To assess the sensitivity and specificity of CTA versus Digital Subtraction Angiography (DSA) in detecting arterial injury and secondarily evaluate the ability of CT to …
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Blood Vessel Segmentation and shape analysis for quantification of Coronary Artery Stenosis in CT Angiography
… segmentation algorithm is developed to extract the coronary arteries based on the framework of active contours. Both global and local intensity statistics are utilised in the energy functional calculation, which allows for dealing with non-uniform brightness conditions, while evolving the …
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Machine learning models for functional impairment risk prediction in ischemic stroke patients
Background: Stroke-related functional impairment risk scores are commonly used to estimate the patient-specific risk of functional impairment in acute care settings. However, these models have been primarily developed based on regression models, which might not provide optimal predictive accuracy, …
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Non-contrast Magnetic Resonance Angiography for Evaluation of Peripheral Arterial Disease
… prevalence of moderate to severe renal dysfunction in PAD patients is estimated at 27-36%. Knowledge of location, severity, and extent of PAD is imperative for accurate diagnosis and treatment planning. However, all established imaging modalities that are routinely used for treatment planning …
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Advancing clinical gait analysis through technology and policy
… and treat disability and to measure the effectiveness of assistive devices. Gait analysis is one technology used to analyze walking, but technical as well as economic, social, and policy issues hinder its clinical adoption. This thesis is divided into two parts that address some of these …
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MECHANICAL ASSESSMENT OF 3D PRINTED PATIENT SPECIFIC PHANTOMS FOR SIMULATION OF MINIMALLY INVASIVE IMAGE GUIDED PROCEDURES
… previously for device testing and physician practice; however, there is not a validation tool for these phantoms, ensuring they accurately replicate physiologic conditions. These phantoms have no previous testing completed to support they simulate EIGI’s correctly for physician practice or …
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Plaquemorphologie bei Karotisstenosen : Möglichkeiten der präoperativen Evaluation durch den 64-Zeiler-Dual-Source-Computertomographen im Vergleich mit den histopathologischen Ergebnissen
… the Plaque composition by using the Dual-Source CT and to compare the results with the histopathological findings. The uniqueness of our study is the scanner-technology, which uses the energy of two x-ray tubes to achive a faster image edition/processing and a higher spatial resolution. …
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Foley catheter balloon tamponade for penetrating neck injuries at Groote Schuur hospital: an update
Introduction Foley catheter balloon tamponade (FCBT) for bleeding penetrating neck injuries (PNIs) is an effective, readily available and easy-to-use technique. This study aims to audit the technique and highlight current investigative and management strategies. Methods All adult patients (18 years …
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Interventionelle Behandlung intrakranieller Gefäßstenosen mittels ballongestützter Angioplastie und Implantation unbeschichteter und medikamentenbeschichteter Stentsysteme
… of the neurological examination were retrospectively transferred to a standardised assessment during evaluation with the modified Rankin Scale. The technical success rate was in the region of 95.3%. We undertook 9 balloon-supported angioplasties and 32 stent implantations (26 uncoated stents …
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Radiomics and Machine Learning in the Prediction of Cardiovascular Disease
Carotid atherosclerosis is a major risk factor for ischaemic stroke which is a leading cause of death worldwide. For stroke survivors, 1 in 4 will have another stroke within five years. Carotid CT angiography (CTA) is commonly performed following an ischaemic stroke or transient ischemic attack to …
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Optimization of image quality and radiation dose in neuroradiological computed tomography
… The goal of clinical computed tomography (CT) is to produce images of diagnostic quality using the lowest possible radiation exposure. Degradation of image quality, with increased image noise and reduced spatial resolution, is a major limitation for radiation dose reduction in CT. This can …
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Assessment of coronary artery plaque progression using 64 slice multi-detector computed tomography (MDCT)
… is one of the leading cause of death. So the effective method for early detection of subclinical CAD and the prevention of developing acute coronary syndrome were emphasized for many years. Coronary MDCT is non-invasive technique, and enable to detect of non-calcified atherosclerotic plaque and …
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CT angiogram findings in patients presenting with mechanical strangulation and near hanging injuries
… neurological outcome. In developed countries, CT angiography (CTA) of the head and neck is performed as a screening tool in the acute clinical setting. This study was undertaken to assess the prevalence of vascular injury in patients presenting acutely to GSH trauma unit with these injuries and …
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Occluson Pattern in Circle of Willis: Prognostic Marker for Endovascular Treatment in Acute Carotid Terminus Occlusion
Background & OBJECTIVES: Although the recent progress in acute ischemic stroke treatment, carotid terminus occlusion (CTO) is quite demanding to recanalize, and even if it is achieved, the morbidity and mortality rates remain high. In this study, we aimed to discover a prognostic marker for acute …
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Clinical Significance of Pattern of Memory Deficits in Amnestic Mild Cognitive Impairment
Background & OBJECTIVES: Although the recent progress in acute ischemic stroke treatment, carotid terminus occlusion (CTO) is quite demanding to recanalize, and even if it is achieved, the morbidity and mortality rates remain high. In this study, we aimed to discover a prognostic marker for acute …
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Novel positron emission tomography applications for imaging cardiovascular disease activity
… of cardiovascular disease. Calcification activity can now be imaged using 18F-sodium-fluoride positron emission tomography and computed tomography which targets microcalcification (diameter <50 μm), providing different information to established macroscopic calcification (minimum diameter …
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Utilidad del dímero D en el diagnóstico de tromboembolismo pulmonar en la Fundación Santa Fé de Bogotá
… realizo un estudio de prueba diagnóstica retrospectivo donde se revisaron las historias clínicas de 109 pacientes adultos de la Fundación Santa Fe de Bogotá en quienes se realizo angioTAC de tórax con protocolo para TEP, con probabilidad diagnóstica de Tromboembolismo Pulmonar Baja o Intermedia …
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Evaluation eines Software-Pakets zur semiautomatischen Segmentation von Plaqueanteilen bei symptomatischer Arteria carotis-Stenose
… dabei entscheidende Risikoindikatoren. In der CT-Diagnostik von Karotisstenosen kann die Segmentierung von Plaquebestandteilen eine Schlüsselfunktion im Schlaganfallmanagement im Rahmen der Sekundärprävention sein. Die Verwendung von semiautomatischen Messmethoden zur Beurteilung umfangreicher …
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Diagnostischer Wert der 64-Zeilen-Mehrschichtspiral-Computertomographie des Herzens bei symptomatischen Patienten
AIMS: Cardiac multi-detector row computed tomography (MDCT) angiography has shown high levels of sensitivity and especially negative predictive value regarding the diagnosis of coronary artery disease (CAD) especially in patients with a low pre-test probability. This study was designed to determine …