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Attenuation Correction
Adjustment for the effect of tissue thicknesses through which gamma's travel from an activity concentration origin to the scanner's detectors. The count rates of a detector are adjusted to values as if there were no attenuation along the gamma's path. This makes possible accurate quantitation in image analysis. (NCI Thesaurus)
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The fraction of beam intensity being lost per unit length of the transmitting material in a chosen x direction.
A weakening in force or intensity.
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