A method to control non-uniformity RF B1 field for high field magnetic resonance imaging

Author

Yoo, Hyoungsuk ; Gopinath, Anand ; Vaughan, T.

Author_Institution

Univ. of Minnesota, Minneapolis, MN, USA

fYear

2010

fDate

23-28 May 2010

Firstpage

1

Lastpage

1

Abstract

The higher static magnetic fields $B_0$, in MRI systems result in higher signal to noise ratios. However, as the wavelength decreases linearly with the higher static magnetic field, image inhomogeneity occurs. This paper demonstrates the use of the convex optimization with an iterative method to improve $B_1Λ +$ uniformity in an anatomic region of interest by varying the magnitude and phase of each RF channel element independently. The simulation results for 16 channels for 9.4 T systems are discussed in detail, with experimental results in a phantom.

Keywords

biomedical MRI; phantoms; MRI system; convex optimization; high field magnetic resonance imaging; image inhomogeneity; nonuniformity RF B1 field control; phantom; static magnetic fields; Biomedical imaging; Control systems; Magnetic fields; Magnetic resonance imaging; Medical control systems; Microwave imaging; Monitoring; Optimization methods; Radio frequency; Signal to noise ratio;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Symposium Digest (MTT), 2010 IEEE MTT-S International

Conference_Location

Anaheim, CA

ISSN

0149-645X

Print_ISBN

978-1-4244-6056-4

Electronic_ISBN

0149-645X

Type

conf

DOI

10.1109/MWSYM.2010.5516743

Filename

5516743