Medical Letter on the CDC & FDA
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West Nile Virus
Studies conducted at National Institutes of Health on physiology recently published
November 9th, 2008
According to a study from the United States, "Physiological fluctuations resulting from the heart beat and respiration are a dominant source of noise in fMRI, particularly at high field strengths. Commonly used physiological noise correction techniques, Such as RETROspective Image CORrection (RETROICOR), rely critically on the timing of the image acquisition relative to the heartbeat, but do not account for the effects of subject motion." "Such motion affects the fluctuation amplitude, yet volume registration can distort the timing information. In this study, we aimed to systematically determine the optimal order of volume registration, slice-time Correction and...
Source: Medical Letter on the CDC & FDA (2008-11-09)
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