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 “"contrast medium"”.
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Clinical Evaluation of RenografinR76% as a Contrast Medium in Urography
One milestone in the history of medicine was the discovery of x-rays by Wilhelm Conrad Roentgen in 1895. This led to the examination of the human body by an indirect method. It was soon learned that internal organs which were diseased could cast an abnormal shadow on an x-ray film. It was further …
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Vascular distribution of contrast medium during intraosseous regional perfusion in the equine distal limb
… To describe the vascular distribution pattern of contrast medium during intraosseous regional perfusion (IORP) of the distal portion of the forelimb in horses. Sample Population — 13 cadaver forelimbs from 12 horses without vascular or orthopedic disease of the distal forelimb. Procedure — Serial …
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A comprehensive study of the impact of contrast medium on endothelial cells in vitro: validating the protective effects of n-acetylcysteine and assessing the importance of endothelin-1 and glutathione on contrast-induced nephropathy in patients with chronic kidney disease
Contrast-induced nephropathy (CIN) is a severe complication that can sometimes affect the kidneys of patients following angiographic procedures that involve the administration of iodinated contrast medium (CM) to aid visualisation of blood vessels in medical imaging. CIN represents around 12% of …
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Sviluppo di un tomografo multi-energy per lo studio pre-clinico di nuove metodiche diagnostiche finalizzate al riconoscimento precoce della patologia tumorale
… technique, the Triple-Energy Radiography with Contrast Medium (TER), has been successfully implemented on our system. TER consist in combining a set of three quasi-monochromatic images of an object, in order to obtain a corresponding set of three single-tissue images, which are the …
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MRT-gesteuerte Ballonangioplastie peripherer Arterien zur lokalen Substanzapplikation in die Gefäßwand
… 10-20µm, through which a solution marked with a contrast-medium and containing Evans blue dye disperse during inflation. In the first instance the suitability of the catheter was investigated with a phantom trial. The emission of the gadodiamid charged agent through the perforations could be …
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Non-invasive diagnostic methods of intracranial arteries
… the impact of increased iodine concentration in contrast medium and decreased tube voltage on arterial attenuation and image quality in computed tomography angiography (CTA) of intracranial arteries, and finally to evaluate the diagnostic accuracy of CTA in non-traumatic subarachnoid haemorrhage …
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Alchemistic Polymers for the Delivery of Therapeutic Agents in Treatment of Pediatric Tracheomalacia
… using non-traditional initiators such as contrast medium and therapeutic agents. The characterization of these polymers leads to the optimization of a coating platform. Using a factorial design, a library of drug delivery particles for the delivery of an anti-inflammatory agent was …
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Diagnostic Imaging of Foreign Bodies and Compartmentalization in the Canine Manus
… in CT images, while MRI provided increased contrast of soft-tissue structures. To test the hypothesis that diagnostic accuracies of CT, MRI, and ultrasound differ for detection of acute wooden foreign bodies in the canine manus, we inserted wooden splinters into canine cadaver manus and …
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Image Quality Optimisation and Dose Management in CT, SPECT/CT, and PET/CT
… that an increased amount of intravenous contrast medium can compensate for a reduced radiation absorbed dose and vice versa, maintaining the signal-to-noise ratio in the liver and contrast-to-noise ratio for a hypothetical hypovascular liver metastasis. Subjective image quality was …
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Magnetic Resonance Imaging of Atherosclerosis
… besides luminal stenosis. Using a special contrast medium called ultrasmall superparamagnetic particles of iron oxide (USPIO), MR imaging can also help in the assessment of carotid plaque inflammation. In this dissertation, I explore the different MR imaging modalities for the assessment of …
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MULTIDISCIPLINARY WORK TO DETERMINE HYDROLOGY OF ARID LAND SPRINGS AND HOW SPRING WATERS INFLUENCE WATER QUALITY AND ECOSYSTEM HEALTH FOR DESERT ENVIRONMENTS
… high WQSC (downstream from perennial spring), 2) medium WQSC (perennial waters upstream from spring) and 3) low WQSC (stream areas that dry). Sampling of biological communities showed that biodiversity varies with and may be influenced by the WQSC. Hydrogeochemical analysis indicate that springs …
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Human studies evaluating dGEMRIC as a prognostic tool for knee osteoarthritis
… used to estimate the GAG content of cartilage. A contrast medium is used, the concentration of which in the cartilage is inversely proportional to the amount of GAG. The purpose of this work was to evaluate dGEMRIC as a prognostic tool for knee cartilage changes and knee OA in humans. It was found …
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Preparation for clinical practice in radiology: a survey of interns and radiologists
… perceived that interns’ understanding of contrast medium was inadequate, and 78%( N=39) perceived that interns were lacking in the knowledge of (N=39) radiation protection. Results of the group concept analysis suggested the following topics to be included in the intern radiology …
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An investigation into variations in the venous drainage pattern in brains of adolescents and adults
… current study 302 magnetic resonance images with contrast medium from the Groote Schuur and Red Cross Children's War Memorial Hospitals were retrospectively reviewed. The volumes of the dural venous sinuses were traced using a novel approach developed for the study. The approach included …
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Imaging Studies of the Canine Cervical Vertebral Venous Plexus
… using a biphasic IV injection of iodinated contrast medium. Dimensions of the IVVP and other vertebral canal components were calculated for the C3-C7 vertebral region. Sagittal diameters of the IVVP ranged from 0.6 mm to 3.2 mm. The IVVP area occupied 30.61% of the cervical vertebral …
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Vergleich von Miktionscystourethrographie und niedrig dosierter, kontrastverstärkter Miktionsurosonographie mittels Harmonic Imaging zur Diagnostik des vesicoureteralen Refluxes bei Kindern
Zielsetzung: Harmonic Imaging produziert Bilder mit hoher Orts- und Kontrastauflösung. Die Mikrobläschen im verwendeten Kontrastmittel werden deutlich sichtbarer. Ziel dieser Studie war es, das diagnostische Potential der kontrastverstärkten Miktionsurosonographie (MUS) mittels Harmonic Imaging bei …
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Imaging of tumours of the urinary tract in children, with particular reference to Wilms' tumour
… the primary imaging modality, and is replacing contrast medium cystography. However, examples of the latter are included as it still has a place, particularly in the less sophisticated institutes. CT and MRI, when available, have imaging advantages in the pelvis and are becoming the methods of …
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Brauchen wir gadoliniumhaltiges Kontrastmittel in der Hirn-MRT-Diagnostik bei Kindern?
Hintergrund und Ziele: Gadolinium (Gd) wird seit 1988 als Kontrastmittel (KM) für Hirn-Magnetresonanztomographie (MRT)-Untersuchungen verwendet und gilt auch heute noch in vielen Kliniken zum Standard einer „lege artis“ durchgeführten pädiatrischen Hirnuntersuchung. Es galt lange Zeit als sehr …
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Enantiomerenreine beta-Diketonate für lumineszierende helicat-artige Komplexe
… one receives a fluorescence signal at 445 nm; in contrast to the highly symmetrical triplestranded helicat which shows no fluorescence activity. The most different functions can be introduced to helicates by choice of suitable metals. Special attention is dedicated in the present work to …
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Developing a Microbubble-based Contrast Agent for X-ray Phase Contrast Imaging to Detect Neovasculature in Breast Cancer
X-ray phase contrast imaging (XPC) generates contrast from refraction and scattering of X-rays, unlike absorption in conventional radiology. This technique greatly improves the sharpness of boundaries and reveals micro-structured tissues that are not easily detected by conventional absorption-based …