Noise and filtration in magnetic resonance imaging

E. R. Mcveigh, R. M. Henkelman, M. J. Bronskill

Research output: Contribution to journalArticlepeer-review

Abstract

Noise in two dimensional Fourier transform magnetic resonance images has been investigated using noise power spectra and measurements of standard deviation. The measured effects of averaging, spatial filtering, temporal filtering, and sampling have been compared with theoretical calculations. The noise of unfiltered images is found to be white, as expected, and the choice of the temporal filter and sampling interval affects the noise in a manner predicted by sampling theory. The shapes of the imager's spatial frequency filters are extracted using noise power spectra.

Original languageEnglish (US)
Pages (from-to)586-591
Number of pages6
JournalMedical Physics
Volume12
Issue number5
DOIs
StatePublished - 1985
Externally publishedYes

Keywords

  • BIOMEDICAL RADIOGRAPHY
  • DIAGNOSTIC TECHNIQUES
  • FILTRATION
  • IMAGE PROCESSING
  • IMAGES
  • NOISE
  • NUCLEAR MAGNETIC RESONANCE

ASJC Scopus subject areas

  • Biophysics
  • Radiology Nuclear Medicine and imaging

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