Word: scans
(lookup in dictionary)
(lookup stats)
Dates: all
Sort By: most recent first
(reverse)
...black jacket with an upturned collar, one in a windbreaker. Two are men. The pedestrian in the windbreaker is a woman. They are talking about Rebel, though no words can be made out. The pedestrian in the heavy wool sweater looks overhead and sees the jetliner. The other two scan the crowd for familiar faces...
...project was routine, Schechter admits, but the results were not. Their scan revealed that rather than becoming uniform, space contains a huge, mysterious "gap." Taking representative samples, they expected to find 25 galaxies the size of the Milky Way. They found only one. Moreover, the same low density seemed to extend over an area 300 million light-years across-about 1 % of the visible universe. The finding of so little matter in so much space had cosmologists all over the world scratching their heads...
...Tuesday night in late September and the city is talking sports. September is always a time of controversy in this city, and this September is no exception. From a quick scan of the radio talk shows it is easy to find the controversy and the arguments that nourish and fortify sports, raising it from the level of a pastime to a zeal, a religion...
...example glucose, which is the brain's main source of energy, tagged with a telltale radioactive substance that emits positively charged particles. These positrons, when they combine with negatively charged electrons normally found in the body's cells, emit gamma rays that can be detected by a scanning device. Collected and translated into color-coded images, the resulting patterns indicate the intensity of metabolic activity. Because the radioactive substances are so short-lived, anyone undergoing a PET scan is exposed to very little radiation...
Still, the most dramatic impact of PET scanning so far has been in studies of the brain. The technique is painlessly providing detailed information about how a normal brain reacts biochemically to such stimuli as the eyes seeing light, the ears hearing a story and even the movement of an arm or a leg. For example, when a subject moves his right hand, the PET scan indicates increased glucose use by the region of the left side of the brain controlling the action. Physicians have begun to use PET scanning in determining therapy for people who have had strokes...