The slope of the tangent line of N P S N R T ( f ) at f = a is negative, and N P S N R T ( f ) has a decreasing trend at f = a .
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Noise reduction profile: A new method for evaluation of noise reduction techniques in CT.
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The slope of the tangent line of N P S N R T ( f ) at f = a is negative, and N P S N R T ( f ) has a decreasing trend at f = a .