BACKGROUND We investigated the applicability and image quality of contrast-enhanced coronary artery visualization by multislice spiral CT using retrospective ECG gating. METHODS AND RESULTS Twenty-five patients in sinus rhythm (significant coronary artery stenoses ruled out by invasive angiography) were studied with a multislice spiral CT (Siemens SOMATOM Volume Zoom). In inspiration (mean br...

Here we present three-dimensional MHD models for the Parker instability in a thick magnetized disk, including the presence of a spiral arm. The B-field is assumed parallel to the arm, and the model results are applied to the optical segment of the Carina-Sagittarius arm. The characteristic features of the undular and interchange modes are clearly apparent in the simulations. The interchange mod...

This study investigates the thermo-mechanical behavior of energy piles equipped with a spiral pipe configuration. The analysis is based on results full-scale pile as well three-dimensional finite element analyses. two five U-shaped pipes connected in series and parallel, characterized by same total length piping network, also analyzed numerically for comparison purposes. this work highlight tha...

PURPOSE To quantitatively assess the performance and reproducibility of 3D spiral coronary artery wall imaging with beat-to-beat respiratory-motion-correction (B2B-RMC) compared to navigator gated 2D spiral and turbo-spin-echo (TSE) acquisitions. MATERIALS AND METHODS High-resolution (0.7 × 0.7 mm) cross-sectional right coronary wall acquisitions were performed in 10 subjects using four techn...

AIM The aim of this study was evaluation of constructive alignment of student perceptions to a spiral curriculum, as a pre-requisite to successful learning. METHOD A survey was undertaken to evaluate student thoughts and experiences of a spiral curriculum, by participation in an anonymous voluntary questionnaire. Students were asked to rate their thoughts on their understanding, perceived ben...

We read with great interest the recent report on blind bedside postpyloric placement by Lv et al. [1]. Their methods were proven to be safe and effective in intensive care units. Although our placing procedure is similar to that reported by the authors, the choice of a postpyloric tube and the patient’s position requires further improvement. In our center, we use a 130-cm long transpyloric tube...

cardiac myocytes under physiological conditions, are described as planar waves traveling along the longitudinal cell axis [1]. Other patterns of Ca wave propagation – circular or spiral Ca waves [2, 3] – have been observed in physiological conditions as well. Lipp & Niggli, 1993 [2], Ishida et al., 1999 [3] and Engel et al., 1994 [4] have described spiral calcium waves as individual events. We ...

We present analysis of WFPC2 imaging of two spiral galaxies partially backlit by E/S0 systems in the pairs AM1316-241 and AM0500-620, as well as the (probably spiral) foreground system in NGC 1275. Images in B and I are used to determine the reddening curve of dust in these systems. The foreground spiral component of AM1316-241 shows dust strongly concentrated in discrete arms, with a reddening...