Noise power spectrum

Last revised by Daniel J Bell ◉ on 20 Jul 2021

Citation, DOI, disclosures and article data

Citation:

Rock P, Bell D, Murphy A, Noise power spectrum. Reference article, Radiopaedia.org (Accessed on 20 Mar 2023) https://doi.org/10.53347/rID-82093

DOI:

https://doi.org/10.53347/rID-82093

Permalink:

https://radiopaedia.org/articles/82093

rID:

82093

Article created:

15 Sep 2020, Patrick J Rock

Disclosures:

At the time the article was created Patrick J Rock had no recorded disclosures.

View Patrick J Rock's current disclosures

Last revised:

20 Jul 2021, Daniel J Bell ◉

Disclosures:

At the time the article was last revised Daniel J Bell had no recorded disclosures.

View Daniel J Bell's current disclosures

Revisions:

4 times, by 3 contributors - see full revision history and disclosures

Sections:

Radiography, Imaging Technology

Synonyms:

Noise power spectral density
Noise power spectrum (NPS)

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.