Abstract: An imaging system which, in one embodiment, includes a timing algorithm which identifies the proper projection data to be used and a modified halfscan image reconstruction algorithm which provides improved image quality along with the benefits of an enhanced temporal response, is described. In an exemplary embodiment, the timing algorithm includes the steps of determining a diastolic period of a patient's heart and corresponding projection data during the diastolic period. The modified halfscan algorithm includes the steps of identifying redundant data and unequally weighting the data. The resulting images are used for coronary calcification detection.

Abstract: A hybrid electrical current switching device comprises a triggerable solid-state current switch connected in parallel with a mechanical switch in which the current flow depends on the relative positioning of a liquid metal conducting medium. The solid-state switching device operates as a crowbar switch to mitigate effects of arcing.

Abstract: A flow nozzle for a circuit interrupter includes a plurality of at least two throat regions which permit at least two transitions from subsonic to supersonic flow in the main nozzle flow channel. Very high speed photographs made of the operation of arc interruption devices of the type considered herein have shown that the greatest amount of arc cooling occurs in transition regions between subsonic and supersonic gas blast flow. Accordingly, the ability of arc interruption devices to quickly extinguish resulting arcs between electrodes in the main flow channel is significantly enhanced by the presence of a plurality of throat regions. These throat regions may be provided by shaped constructions or by bypass collars disposed in the downstream position of the main flow channel. The instant invention is applicable both to conventional single-flow and dual-flow interrupter nozzle designs.