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1. Unwanted additions to a signal not arising at its source; e.g., the 60-cycle frequency wave in an electrocardiogram; includes visual n. on imaging studies; largely eliminated from modern (post-1980) machines. See signal-to-noise ratio. 2. Extraneous uncontrolled variables influencing the distibution of measurements in a set of data. [M.E., fr. O.Fr., fr. L.L. nausea, seasickness]
structured n. in radiology, the signals from anatomic structures which interfere with the detection of significant pathology.
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