Qiuliang Wang

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PURPOSE To improve the performance of non-Cartesian partially parallel imaging (PPI) by exploiting artificial sparsity, the generalized autocalibrating partially parallel acquisitions (GRAPPA) operator for wider band lines (GROWL) is taken as a specific example for explanation. THEORY This work is based on the GRAPPA-like PPI having an improved(More)
In this paper, we introduce and analyze a new stabilized finite element method based on combining Nitsche’s method with a ghost penalty method for two-phase Stokes flows involving two different kinematic viscosities by using the lowest equal order velocity–pressure pairs. The interface between two-phase flows does not need to align with the mesh and(More)
The uniformity of the static magnetic field B0 is of prime importance for an MRI system. The passive shimming technique is usually applied to improve the uniformity of the static field by optimizing the layout of a series of steel shims. The steel pieces are fixed in the drawers in the inner bore of the superconducting magnet, and produce a magnetizing(More)
A superconducting rotor with the high-speed rotation is driven by the torque generated from stator coils at low temperature in 4.2 K. It is necessary to fill the rotor housing with cold helium gas to remove the heat from the superconducting rotor to the support structure. However, it will bring the drag force from the gas, which has a negative effect on the(More)
A large bore NbTi superconducting magnet is designed, manufactured and tested. The superconducting magnet has an inner diameter of 460 mm, outer diameter of 600 mm and height of 540 mm. The magnet is dry wound using rectangular and round superconducting wires with their dimensions of 1.3 2.0 mm and 1.3 mm respectively. In order to improve helium cooling(More)
This paper presents a novel passive shimming method for the effective correction of static magnetic field (B0) inhomogeneities in Magnetic Resonance Imaging (MRI) systems. Passive shimming is used to find an optimum configuration for the placement of iron pieces applied to improve the B0 uniformity in the predefined imaging region referred to as the(More)
It occurred a large-scale landslide in the Three Gorges Reservoir, Qianjiangping village, shazhenxi town, Zigui County on July 13, 2003, causing serious economic losses and casualties. The digital telemetry seismic network in the Three Gorges Reservoir recorded a complete landslide sliding process of ground vibration, and obtained five micro-fracture events(More)