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Technological advances of position aware devices lead to a wealth of data documenting the lifelines of GPS-tracked animals, people, or vehicles. The integration of knowledge discovery techniques in GIS is thus an important research field with respect to the emerging volumes of tracking data. The motivation of this research is to find patterns in the way(More)
PURPOSE Colour coded duplex sonography (DS) is widely used for the assessment of renal artery stenosis (RAS). Different criteria have been specified for the detection of significant RAS. The aim of our study was to compare routinely used DS criteria, both with intra-arterial pressure gradients and arteriographic degree of stenosis, and to validate different(More)
The use of contrast-enhanced ultrasound (CEUS) for vascular imaging indications has increased dramatically during the last decade. Ultrasound contrast agents are gas-filled microbubbles that are injected into the bloodstream and serve as strict intravascular reflectors of ultrasound waves. Numerous studies have addressed the potential clinical use of CEUS(More)
STUDY OBJECTIVE A recently introduced, multidimensional index called BODE (body mass index [BMI], degree of airflow obstruction assessed by spirometry, grade of dyspnea, and exercise capacity), quantified by 6-min walking distance (6MWD), has excellent predictive power with respect to outcome in COPD. We investigated whether the BODE index is able to(More)
OBJECTIVES We sought to validate a new noninvasive technique to determine central venous pressure (CVP) using high-resolution compression sonography. BACKGROUND Information concerning CVP is crucial in clinical situations, including cardiac failure, volume overload, and sepsis. The measurement of CVP, however, requires puncture of a vein with attendant(More)
The overall goal of the ongoing project is to develop methods for spatio-temporal analysis of relative motion within groups of moving point objects , e.g. GPS-tracked animals. Whereas recent efforts of dealing with dynamic phenomena within the GIScience community mainly concentrated on modeling and representation, this research project concentrates on the(More)
PURPOSE To prospectively compare calf muscle BOLD MRI with transcutaneous oxygen pressure (TcPO2 ) measurement in patients with systemic sclerosis (SSc) and healthy volunteers and thereby get insight into the pathogenesis of vasculopathy in this connective tissue disorder. MATERIALS AND METHODS Twelve patients with SSc (6 women and 6 men, mean age 53.5 ±(More)
INTRODUCTION Muscle symptoms in systemic sclerosis (SSc) may originate from altered skeletal muscle microcirculation, which can be investigated by means of blood oxygenation level dependent (BOLD) magnetic resonance imaging (MRI). METHODS After ethics committee approval and written consent, 11 consecutive SSc patients (5 men, mean age 52.6 years, mean SSc(More)
OBJECTIVES To compare the diagnostic performance between a vascular specialist and a rheumatologist not familiar with vascular ultrasound when applying the compression sign for the diagnosis of temporal arteritis. METHODS Sixty consecutive patients with suspicion of giant cell arteritis were examined by both examiners. Compression of the temporal artery(More)
PURPOSE In patients with suspected giant cell arteritis (GCA), a search for the perivascular halo sign, a sophisticated color duplex ultrasound (CDU) finding, at experienced centers reliably identifies inflamed temporal arteries (TA). We tested whether TA compression in patients with GCA, a simple, largely operator-independent maneuver, elicits contrasting(More)