Noise estimation in MR GRAPPA reconstructed data

Author

Aja-Fernández, Santiago ; Vegas-Sánchez-Ferrero, Gonzalo ; Tristán-Vega, Antonio

Author_Institution

ETSI Telecomun., Univ. de Valladolid, Valladolid, Spain

fYear

2011

fDate

March 30 2011-April 2 2011

Firstpage

1815

Lastpage

1818

Abstract

A new method to estimate the variance of noise from the composite magnitude signal of GRAPPA reconstructed images is presented. Parallel imaging methods allow to increase the acquisition rate via subsampled acquisitions of the k-space. However, the reconstruction process yields to a variance of noise value which is dependent on the position within the image. The proposed method uses information of the GRAPPA reconstruction coefficients and assumes a final non-central chi distribution to recover the spatial pattern of noise.

Keywords

biomedical MRI; image reconstruction; medical image processing; GRAPPA reconstructed images; GRAPPA reconstruction coefficients; MR GRAPPA reconstructed data; NOISE; composite magnitude signal; k-space; noise estimation; non-central chi distribution; parallel imaging methods; Coils; Estimation; Image reconstruction; Magnetic resonance imaging; Noise; Pixel; GRAPPA; Magnetic Resonance; Noise estimation; parallel imaging;

fLanguage

English

Publisher

ieee

Conference_Titel

Biomedical Imaging: From Nano to Macro, 2011 IEEE International Symposium on

Conference_Location

Chicago, IL

ISSN

1945-7928

Print_ISBN

978-1-4244-4127-3

Electronic_ISBN

1945-7928

Type

conf

DOI

10.1109/ISBI.2011.5872759

Filename

5872759