Noise power spectrum

Last revised by Daniel J Bell on 20 Jul 2021

The noise power spectrum (NPS), also known as the power spectral density, of a signal, is the Fourier transform of the noise autocorrelation. It gives the intensity of noise as a function of spatial frequency. It is used in all the main radiological modalities, most commonly x-ray-based, i.e. radiography and CT, but also MRI and, more recently, ultrasound 1-4.

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