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A comparison of two methods for measuring the signal to noise ratio on MR images

Lookup NU author(s): Dr Michael FirbankORCiD, Dr Roger Harrison, Professor David Williams


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The signal to noise ratio (SNR) is one of the important measures of the performance of a magnetic resonance imaging (MRI) system. The object of this study was to compare a single acquisition method, which estimates the noise from background pixels, with a dual acquisition method which estimates the noise from the subtraction of two sequentially acquired images. The dual acquisition method is more exact, but is slower to perform and requires image manipulation. A comparison between the two methods gave a good correlation, and a regression equation of SNRsingle = 1.1 + 0.94 SNRdual. The single acquisition method is therefore appropriate for use in a quality assurance programme, since it is quicker and simpler to perform and is a good indicator of the more exact measure.

Publication metadata

Author(s): Firbank MJ, Coulthard A, Harrison RM, Williams ED

Publication type: Article

Publication status: Published

Journal: Physics in Medicine and Biology

Year: 1999

Volume: 44

Issue: 12

Pages: N261-N264

Print publication date: 01/12/1999

ISSN (print): 0031-9155

ISSN (electronic): 1361-6560

Publisher: Institute of Physics Publishing Ltd.


DOI: 10.1088/0031-9155/44/12/403


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