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

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

doi:10.1002/mrm.1910380524

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

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

School of Medicine

Research output: Contribution to journal › Article › peer-review

380 Scopus citations

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.

Original language	English (US)
Pages (from-to)	852-857
Number of pages	6
Journal	Magnetic Resonance in Medicine
Volume	38
Issue number	5
DOIs	https://doi.org/10.1002/mrm.1910380524
State	Published - Nov 1997

Keywords

Noise correlations
Phased array coils
Signal-to-noise

ASJC Scopus subject areas

Radiology Nuclear Medicine and imaging
Radiological and Ultrasound Technology

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10.1002/mrm.1910380524

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AB - 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.

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KW - Phased array coils

KW - Signal-to-noise

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

Abstract

Keywords

ASJC Scopus subject areas

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