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Literature DB >> 9358462

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

C D Constantinides¹, E Atalar, E R McVeigh.

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.

Mesh：

Year: 1997 PMID： 9358462 PMCID： PMC2570034 DOI： 10.1002/mrm.1910380524

Source DB: PubMed Journal: Magn Reson Med ISSN： 0740-3194 Impact factor: 4.668

16 in total

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Journal: Magn Reson Med Date: 1992-02 Impact factor: 4.668

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Authors: C J Hardy; P A Bottomley; K W Rohling; P B Roemer
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163 in total

1. Investigation of complex phased array coil designs for cardiac imaging.

Authors: M Nittka; A Haase
Journal: MAGMA Date: 2000-06 Impact factor: 2.310

2. Multishot EPI-SSFP in the heart.

Authors: Daniel A Herzka; Peter Kellman; Anthony H Aletras; Michael A Guttman; Elliot R McVeigh
Journal: Magn Reson Med Date: 2002-04 Impact factor: 4.668

3. Free-breathing inner-volume black-blood imaging of the human heart using two-dimensionally selective local excitation at 3 T.

Authors: Khaled Z Abd-Elmoniem; Christoph Barmet; Matthias Stuber
Journal: Magn Reson Med Date: 2011-12-09 Impact factor: 4.668

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

1. Noise correlations exist for independent RF coils.

2. Noise correlations in data simultaneously acquired from multiple surface coil arrays.

3. Noise correlation in multicoil receiver systems.

4. Noise correlation.

5. A phased array coil for human cardiac imaging.

6. Calculation of the signal-to-noise ratio for simple surface coils and arrays of coils.

7. An unbiased signal-to-noise ratio measure for magnetic resonance images.

8. The Rician distribution of noisy MRI data.

9. The use of power images to perform quantitative analysis on low SNR MR images.

10. An NMR phased array for human cardiac 31P spectroscopy.

1. Investigation of complex phased array coil designs for cardiac imaging.

2. Multishot EPI-SSFP in the heart.

3. Free-breathing inner-volume black-blood imaging of the human heart using two-dimensionally selective local excitation at 3 T.

4. Myocardial tagging with SSFP.

5. Coil compression for accelerated imaging with Cartesian sampling.

6. Measuring signal-to-noise ratio in partially parallel imaging MRI.

7. Optimal real-time estimation in diffusion tensor imaging.

8. Feasibility of 7T MRI for imaging fascicular structures of peripheral nerves.

9. Feasibility of in vivo diffusion tensor imaging of articular cartilage with coverage of all cartilage regions.

10. The impact of gradient strength on in vivo diffusion MRI estimates of axon diameter.