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 28 for “"Doppler imaging"”.
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Coherent flow power Doppler imaging
… perfusion. Conventional techniques include color Doppler imaging and power Doppler (PD) imaging. These methods depend on either the measurement of phase change or the detection of the power of backscattered echoes from blood. Both techniques are susceptible to noise. Common noise sources include …
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Zeeman-Doppler Imaging of active late-type stars
… untersuchen. Glücklicherweise haben wir mit der Dopplerverschiebung sowie der Polarisation von Licht Mittel zur Verfügung, um indirekt die Magnetfeldtopologie entfernter Sternen zu rekonstruieren, wenn auch nur die schnell rotierender. Die auf den beiden genannten Effekten basierende …
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EI Eridani and the art of doppler imaging : a long-term study
… Eine indirekte Rekonstruktionsmethode namens 'Doppler Imaging' erlaubt es jedoch, auf die Temperaturverteilung auf der Sternoberfläche zu schließen. Für diese Arbeit wurden elf Jahre kontinuierlicher spektroskopischer Beobachtungen des aktiven Doppelsterns EI Eridani herangezogen, um insgesamt …
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Robotic telescopes & Doppler imaging : measuring differential rotation on long-period active stars
… Indirekt kann man dies jedoch mit Hilfe der Doppler-imaging Methode erreichen, die die Doppler-Verbreitung der Spektrallinien von schnell rotierenden Sternen benützt. Um jedoch ein Bild der Sternoberfläche zu erhalten, bedarf es vieler hochaufgelöster spektroskopischer Beobachtungen, die …
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Measurement of sacroiliac joint stiffness with Doppler imaging of vibrations – A reliability study
… contentious with regard to their reliability. Doppler Imaging of Vibrations (DIV) has been advocated as one alternative adjunct method of evaluating SIJ dysfunction. Purpose: The aim of this research was to test reliability of the DIV technique to assess SIJ stiffness within a normal population …
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Ultrasound tissue perfusion imaging
… and potential malignancy. Ultrasonic pulsed Doppler imaging is a safe and economical modality for noninvasive monitoring of blood flow. However, weak blood echoes make it difficult to detect perfusion using standard methods without the expense of contrast enhancement. Additionally, imaging …
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Semantically Based Lexical Processing Yields Unique Topographic Contributions to the Speech Bereitschaftspotential
… The present study also introduced the use of Doppler imaging of the tongue as a means of eliminating potential artifactual tongue movements from the speech BP.
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Non-invasive optical monitoring of free and bound oxygen in humans
… spectroscopy (I-II), blood perfusion by laser Doppler imaging (I) and blood volume by tissue viability imaging (I) in skeletal muscle and skin were studied, and continuous-wave and timeresolved near-infrared spectroscopy were compared (II) in healthy volunteers subjected to various defined …
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Application of remote ischaemic preconditioning to human coronary artery bypass surgery
… 2D contrastenhanced echocardiography and tissue Doppler imaging) or offer antiarrhythmic benefit (de novo left bundle branch block or Q waves; ventricular tachyarrhythmia incidence). RIPC did not afford renal (peak creatinine, AUC urinary albumin-creatinine ratios, dialysis requirement) or lung …
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Clinical assessment of arterial stiffness
… to investigate the reproducibility of a tissue Doppler imaging (TDI) based ultrasound system to calculate indices of arterial stiffness, and to investigate changes in arterial wall stiffness in subjects with increased age, peripheral arterial disease (PAD), chronic kidney disease (CKD) and …
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Three-Dimensional Ultrasound Imaging For Blood Flow Assessment In First Carpometacarpal Osteoarthritis
… diagnosis, and treatment. Current clinical imaging modalities, x-ray and magnetic resonance imaging, are limited by their soft tissue contrast, and accessibility, respectively. There is a clinical need for point-of-care imaging tools to improve OA care. This thesis reports on an …
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Effetti cardiotossivi precoci e tardivi del trattamento con Epirubicina. Valutazione con marker biochimici ed ecocardiografia Tissue Doppler.
… conventional echocardiography, as well as tissue Doppler imaging (TDI) with Strain (ε) and Strain Rate (SR). Moreover, echocardiographic changes identified during the Epi treatment were compared with inflammatory and oxidative stress laboratory markers. Thirty-one patients (age 59±14 yrs) with …
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Assessment of Mechanical and Hemodynamic Vascular Properties using Radiation-Force Driven Methods
… of CVD.</p><p>This thesis describes novel imaging approaches for combining clinically-accepted,</p><p>ultrasound-based flow velocity estimation techniques (color-flow Doppler and spectral-</p><p>Doppler imaging) with ARF-based elasticity characterization of vascular tissue. …
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Cavitation monitoring and spatial mapping for pulsed high-intensity focused ultrasound enhanced drug delivery
… To spatially detect cavitation, a new ultrasound imaging method termed "Bubble Doppler" was developed to detect microbubbles using a modification of Doppler processing. This method was shown to provide sensitivity superior to that of existing cavitation detection methods, and has high spatial …
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Improving Cardiovascular Risk Assessment with CT Coronary Angiography and Myocardial CT Perfusion
… utilizing both high temporal-resolution tissue Doppler imaging and CT. The period of mid-diastole was found to occur relatively later in the cardiac cycle with increasing heart rate. The study demonstrated the importance of heart rate control and precise timing in cardiac imaging. The coronary …
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Proteomic analysis of interstitial fluid for novel markers of the cutaneous response to injury
… of the inflammatory response, using Laser Doppler Imaging and a bead-based cytokine flow cytometric assay, respectively. A shotgun proteomic analysis was then undertaken to characterise of the protein content of the fluid obtained using microdialysis, dialysate. The phosphorylation status …
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Resonance Tracking and Vibration Stabilisation of Ultrasonic Surgical Instruments
… visibility of standard medical needles in colour Doppler imaging. <br/>
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Single Crystal Based Ultrasound Actuated Needle For Regional Anaesthesia and Biopsy
… is widely used in clinical practice. Ultrasound imaging has improved the efficacy and reduced some side effects during regional nerve block. However, the presentation and interpretation of real-time ultrasound guided needle interventions remains inaccurate and unreliable. Poor visibility occurs …
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Left Ventricular Diastolic Function in Adolescents with Overweight and Obesity: The Moderating Influence of Physical Activity, Cardiorespiratory Fitness, and Metabolic Health
… were best demonstrated by septal tissue-Doppler imaging (TDI) methods of echocardiography (z-score difference=0.91; 95% CI=0.46, 1.37). This study also identified preliminary evidence for links of insulin resistance (IR) and CRF with LVDF, but there were no studies to address the …
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Investigating nutrient excess and endothelial dysfunction: a role for BACE1 and amyloid?
… function was measured in vivo using laser Doppler imaging in several mouse models of nutrient excess and varying circulating Aβ levels. A 6-month old 10-week high-fat diet (HFD)-fed mouse (45% HFD) and an 8-week old db/db mouse were used as models of nutrient excess. A 10-12-week old, …
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