摘要:
Magnetic resonance imaging method and apparatus are provided for mapping the internal or bulk motion of an object by labeling the phase of a specimen magnetization with a selected spatial function and measuring changes in the phase of the magnetization. The spatial function is selectable to provide magnetization phase modulation corresponding to displacements in a selected direction, such as a radial or azimuthal direction. Methods and apparatus for producing images based on magnetization phase modulation acquire image data based on stimulated echos and stimulated anti-echos. In an embodiment, a series of 180 degree pulses produces alternating stimulated and stimulated anti-echos that are measured and assigned to respective images.
摘要:
Magnetic resonance imaging method and apparatus are provided for mapping the internal or bulk motion of an object by labeling the phase of a specimen magnetization with a selected spatial function and measuring changes in the phase of the magnetization. The spatial function is selectable to provide magnetization phase modulation corresponding to displacements in a selected direction, such as a radial or azimuthal direction. Methods and apparatus for producing images based on magnetization phase modulation acquire image data based on stimulated echos and stimulated anti-echos. In an embodiment, a series of 180 degree pulses produces alternating stimulated and stimulated anti-echos that are measured and assigned to respective images.
摘要:
An apparatus and method are disclosed for improving imaging based on a time-series of images. In one embodiment, a time-series of images are acquired using a same imaging protocol of the same subject area, but the images are spaced in time by one or more time intervals (e.g, 1, 2, 3 . . . seconds apart). A sub-region is projected across all of the images to perform a localized analysis (corresponding X-Y pixels or X-Y-Z voxels are analyzed across all images) that identifies temporal components within each sub-region. In some of the sub-regions, the temporal components are removed when the amplitude of the component is below a predetermined amplitude threshold. The images are then combined using the sub-regions with reduced components in order to obtain a single image with reduced noise.
摘要:
An MRI probe/transmitter coil has a pair of concentric cylinders with a plurality of inductively coupled freely rotating resonant elements radially mounted between the two cylinders. The coil can be tuned both symmetrically by pivoting all the resonant elements uniformly or asymmetrically by tuning them individually. The coil is driven in quadrature by a quad-hybrid circuit. A substantial part of the electromagnetic energy is stored in the resonant elements outside of the loading region of the coil to reduce perturbation in the coil operation due to the characteristics of the test subject.
摘要:
An apparatus and method are disclosed for improving imaging based on a time-series of images. In one embodiment, a time-series of images are acquired using a same imaging protocol of the same subject area, but the images are spaced in time by one or more time intervals (e.g, 1, 2, 3 . . . seconds apart). A sub-region is projected across all of the images to perform a localized analysis (corresponding X-Y pixels or X-Y-Z voxels are analyzed across all images) that identifies temporal components within each sub-region. In some of the sub-regions, the temporal components are removed when the amplitude of the component is below a predetermined amplitude threshold. The images are then combined using the sub-regions with reduced components in order to obtain a single image with reduced noise.
摘要:
During monitoring of IP network traffic, network application monitoring metrics are extracted, aggregated into logical group types and subsequently analyzed by identifying group sets of the logical group types, correlating anomalous conditions across the logically grouped and aggregated metrics, and isolating the anomalous conditions to one or more related members of the logical group types. The metrics may include usage metrics, network performance metrics and application performance metrics.
摘要:
A system and method to visually navigate hierarchical data groups are provided. If a user wishes to graphically view network traffic data for a particular business group of network nodes, a network topology navigation tool may be provided to display to the user such information that is relevant to the selected business group and the corresponding hierarchy level. The user may also be permitted to access more detailed connection information through appropriate drill-downs.
摘要:
Nodes of a network may be allocated to a number of logical groups thereof, and storage space within a network traffic monitoring device coupled to the network then allocated so as to ensure network traffic data for at least a minimum number of the nodes of each of the logical groups is stored.
摘要:
A system and method to visually navigate hierarchical data groups are provided. If a user wishes to graphically view network traffic for a particular business group of network nodes, a network topology navigation tool may be provided to display to the user such information that is relevant to the selected business group and the corresponding hierarchy level. The user may also be permitted to access more detailed connection information through appropriate drill-downs.
摘要:
Network traffic information for nodes of a first logical hierarchy is stored at a monitoring device according to ranks of the nodes within the logical hierarchy as determined by each node's position therein and user preferences. At least some of the network traffic information stored at the network monitoring device may then be reported to another network monitoring device, where it can be aggregated with similar information from other network monitoring devices. Such reporting may occur according to rankings of inter-node communication links between nodes of different logical hierarchies of monitored nodes.