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Frequency-Selective Fat Suppression Radiofrequency Pulse Train to Remove Olefinic Fats.
MedLine Citation:
PMID:  23990698     Owner:  NLM     Status:  Publisher    
CHESS pulse can suppress the signal originating from aliphatic fat protons but cannot suppress the signal from olefinic fat protons, which is near the resonance frequency of water protons. Adipose tissue contains various fat species; aliphatic fat comprises about 90 % and olefinic fat about 10 % of adipose tissue. Thus, CHESS pulse cannot be used to suppress the signal from adipose tissue completely. The purpose of this study was to find a method to suppress the signal from adipose tissue completely. The Fatsat train pulse, created with an arbitrary flip angle and insensitive to B1 inhomogeneity, was used. Because B1 inhomogeneity is larger on higher field magnetic resonance imaging, the fat suppression radiofrequency pulse needs to be B1-insensitive. To investigate a percentage of olefinic fat in adipose tissues, the excitation frequency of the Fatsat train pulse was varied from -240 to +400 Hz and the images and fat-suppressed images were obtained. The presence of olefinic fat comprising about 10 % of abdominal adipose tissue was identified. The result agreed with some previous papers. Complete fat suppression could be achieved by partial (10 %) inversion of longitudinal aliphatic fat magnetization and by canceling out the two fat magnetizations. The flip angle was identified to about 95°. In conclusion, the cause that the signal from adipose tissues cannot be suppressed completely has been found. Improved images that signals from adipose tissues were suppressed completely have been demonstrated. This technique can also be applied to several pulse sequences.
Takayuki Abe
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-7-19
Journal Detail:
Title:  Applied magnetic resonance     Volume:  44     ISSN:  0937-9347     ISO Abbreviation:  Appl Magn Reson     Publication Date:  2013  
Date Detail:
Created Date:  2013-8-30     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9204100     Medline TA:  Appl Magn Reson     Country:  -    
Other Details:
Languages:  ENG     Pagination:  1213-1221     Citation Subset:  -    
Molecular Imaging Center, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba, 263-8555 Japan.
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