Signal-to-noise measurements in magnitude images from NMR phased arrays

Author

Constantinides, Chris D. ; Atalar, Ergin ; McVeigh, Elliot

Author_Institution

Dept. of Biomed. Eng., Johns Hopkins Univ., Baltimore, MD, USA

Volume

1

fYear

1997

fDate

30 Oct-2 Nov 1997

Firstpage

456

Abstract

A method is proposed to estimate signal-to-noise ratio (SNR) values in phased array magnitude images, based on a region-of-interest (ROI) analysis. It is shown that the SNR can be found by correcting the measured signal intensity for the noise bias effects and by evaluating the noise variance as the mean square value of all the pixel intensities in a chosen background ROI, divided by twice the number of receivers used. Estimated SNR values are shown to vary spatially within a bound of 20% with respect to the true SNR values as a result of noise correlations between receivers

Keywords

biomedical MRI; biomedical equipment; coils; MRI; NMR phased arrays; magnetic resonance imaging; magnitude images; measured signal intensity; medical diagnostic imaging; medical instrumentation; noise bias effects; noise correlations between receivers; noise variance; phased array coils; pixel intensity mean square value; signal-to-noise measurements; Background noise; Biomedical measurements; Image reconstruction; Noise measurement; Nuclear magnetic resonance; Phase measurement; Phase noise; Phased arrays; Pixel; Signal to noise ratio;

fLanguage

English

Publisher

ieee

Conference_Titel

Engineering in Medicine and Biology Society, 1997. Proceedings of the 19th Annual International Conference of the IEEE

Conference_Location

Chicago, IL

ISSN

1094-687X

Print_ISBN

0-7803-4262-3

Type

conf

DOI

10.1109/IEMBS.1997.754578

Filename

754578