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Arterial spin labeling (ASL) permits quantification of tissue perfusion without the use of MR contrast agents. With standard ASL techniques such as flow-sensitive alternating inversion recovery (FAIR) the signal from arterial blood is measured at a fixed inversion delay after magnetic labeling. As no image information is sampled during this delay, FAIR(More)
BACKGROUND This study evaluated the wearable cardioverter-defibrillator (WCD) for use and effectiveness in preventing sudden death caused by ventricular tachyarrhythmia or fibrillation. METHODS From April 2010 through October 2013, 6043 German WCD patients (median age, 57 years; male, 78.5%) were recruited from 404 German centers. Deidentified German(More)
BACKGROUND The inspiratory medial movement of the nasal wing at high flow velocities is a protective physiologic mechanism. If this collapse of the nasal wing occurs at lower flow velocities, it may result in nasal obstruction. "Nasal wing collapse" is generally a clinical diagnosis. However, in the pressure-flow relationship of rhinomanometry, the medial(More)
PURPOSE In follow-up examinations of irradiated brain metastases conventional contrast-enhanced morphological MR imaging is often unable to distinguish between transient radiation effects, radionecrosis,and tumor recurrence. To evaluate changes of relative cerebral blood flow (rCBF) in irradiated brain metastases arterial spin-labeling techniques (ASL) were(More)
AIMS Device implantation may be challenging in patients with venous abnormalities. The most common congenital variation--frequently associated with other congenital abnormalities--is described as persistent left superior vena cava (PLSVC). METHODS AND RESULTS The present case series demonstrates successful implantable cardioverter defibrillator (ICD) lead(More)
Coupled systems of differential-algebraic equations (DAEs) may suffer from insta-bilities during a dynamic iteration. For a general dynamic iteration, we extend the existing analysis on recursion estimates, error transport and stability to a general DAE setting. In this context, we discuss the influence of certain coupling structures and the computational(More)