Methods Consecutive patients recruited to the UK GCA Consortium study were invited. 49 patients (median disease duration 4.5 years) underwent CMR at 3.0T (Philips Achieva TX). Cine images were acquired to measure the diameter of the ascending aorta (AsAo) and descending aorta (DsAo) at the level of the main pulmonary artery (MPA) and aortic arch from luminal edge-to-edge. Aortic stiffness was a...

Analysis of velocity acceleration proximal to a regurgitant valve has been proposed as a method to quantify the regurgitant flow rate (Qo). Previous work has assumed inviscid flow through an infinitesimal orifice, predicting hemispheric isovelocity shells, with calculated flow rate given by Qc = 2 pi rN2vN, where vN is user-selected velocity of interest and rN is the distance from that velocity...

The flow in the gap between an inner rotating cylinder concentric with an outer stationary cylinder with an imposed pressure-driven axial flow was studied experimentally using particle image velocimetry ~PIV! in a meridional plane of the annulus. The radius ratio was h50.83 and the aspect ratio was G547. Velocity vector fields for nonwavy toroidal and helical vortices show the axial flow windin...

We have investigated the redshift space distortions in the optically selected Durham/UKST Galaxy Redshift Survey using the 2-point galaxy correlation function perpendicular and parallel to the observer's line of sight, ξ(σ, π). We present results for the real space 2-point correlation function, ξ(r), by inverting the optimally estimated projected correlation function, which is obtained by integ...

Although it is in principle possible to determine the direction of motion of an object by combining the motion of its one-dimensional oriented contours (Fennema CL, Thompson WB. Comput. Graph. Image Processing 1979;9:301-315) there is still much debate on whether human observers can do so. The Intersection Of Constraint (IOC) rule proposed by Adelson and Movshon (Adelson EH, Movshon JA. Nature ...

one method of solving the governing equations of fluid flow about complex geometries is to use multi-zonal method. in this method the overall domain is divided into small number of simpler domains. in each zone, the flow field is solved independently of other zones. the boundary conditions for connecting zones are enforced to convey the necessary linkage. this multi – zonal procedure has been a...

Horizontal and vertical components of optokinetic nystagmus (OKN) were measured using the magnetic search coil technique in normal human adults during presentation of simple and complex moving patterns. Simple patterns were gratings moving horizontally and obliquely. Complex moving patterns consisted of plaids formed by superimposed oblique motion of two sets of gratings or of illusory contours...

We present the results of a 24 ks XMM-Newton observation of the NGC5171 group of galaxies. NGC5171 is unusual in that it is an X-ray bright group (LX > 10 erg s), with irregular contours which are not centred on a bright galaxy (e.g. Mulchaey et al. 2003). The global spectrum is adequately described by a single temperature APEC model with TX = 0.96±0.04 keV, and Z = 0.13±0.02 Z⊙, in good agreem...

Doppler–Imaged Flow Convergence Region: Limitations To the Editor: I would like to congratulate Ishii et al1 for a very interesting study in the February 6, 2001, issue of Circulation on the use of 3D reconstruction of the color Doppler–imaged flow convergence region in ventricular septal defects. Their study, however, fails to mention 2 significant limitations of the flow convergence method. F...