Exact correction of sharply varying off-resonance effects in spiral MRI

Author

Makhijani, Mahender K. ; Nayak, Krishna S.

Author_Institution

Dept. of Electr. Eng., Southern California Univ., CA

fYear

2006

fDate

6-9 April 2006

Firstpage

730

Lastpage

733

Abstract

Magnetic resonance imaging with non-Cartesian acquisition schemes suffer from blurring artifacts induced by off-resonance. Conventional algorithms for off-resonance correction are approximate in nature and assume that the off-resonance map is varying smoothly across the object. This assumption is violated in the case of susceptibility related off-resonance which is sharply varying near certain tissue interfaces. Iterative methods have been proposed for sharply varying off-resonance correction but are either computationally intense in the exact form or need approximations like time segmentation to reduce computational cost. Here a new method for accurate and computationally efficient off resonance correction using spatial domain deconvolution is presented

Keywords

biological tissues; biomedical MRI; deconvolution; image segmentation; iterative methods; medical image processing; blurring artifacts; exact off-resonance correction; iterative methods; magnetic resonance imaging; nonCartesian acquisition schemes; sharply varying off-resonance effects; spatial domain deconvolution; spiral MRI; susceptibility related off-resonance; time segmentation; tissue interfaces; Chemicals; Deconvolution; Frequency; Image reconstruction; Interpolation; Iterative methods; Magnetic resonance imaging; Magnetic susceptibility; Nonuniform electric fields; Spirals;

fLanguage

English

Publisher

ieee

Conference_Titel

Biomedical Imaging: Nano to Macro, 2006. 3rd IEEE International Symposium on

Conference_Location

Arlington, VA

Print_ISBN

0-7803-9576-X

Type

conf

DOI

10.1109/ISBI.2006.1625020

Filename

1625020