Title :
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
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;
Conference_Titel :
Biomedical Imaging: Nano to Macro, 2006. 3rd IEEE International Symposium on
Conference_Location :
Arlington, VA
Print_ISBN :
0-7803-9576-X
DOI :
10.1109/ISBI.2006.1625020
