Document Detail


B(1) mapping with selective pulses.
MedLine Citation:
PMID:  22246956     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Knowledge of B 1+ distribution is crucial for many applications, such as quantitative MRI. A novel method has been developed to improve the accuracy of the conventionally applied double-angle method for B 1+ mapping. It solves the remaining issues raised by the use of selective pulses for slice selection to accelerate the acquisition process. A general approach for reconstructing B 1+ maps is presented first. It takes B 1+-induced slice profile distortions over off-resonance frequencies into account. It is then shown how the ratio between the prescribed flip angles can be adjusted to reach a compromise between the level of noise propagated onto B 1+ maps and the width of the range in which the field can be mapped. Lastly, several solutions are proposed for reducing the B 1+-dependent pollution of regions distal to the image slice which participates significantly in the inaccuracy of B 1+ mapping. These methods were experimentally tested by comparison with gold standard B 1+ maps obtained on a phantom using a non-selective and thus much slower technique. As they are independent and lead to significant improvements, these solutions can be combined to achieve high precision and fast B 1+ mapping using spin-echo DAM. Magn Reson Med, 2012. © 2012 Wiley Periodicals, Inc.
Authors:
Mustapha Bouhrara; Jean-Marie Bonny
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-1-13
Journal Detail:
Title:  Magnetic resonance in medicine : official journal of the Society of Magnetic Resonance in Medicine / Society of Magnetic Resonance in Medicine     Volume:  -     ISSN:  1522-2594     ISO Abbreviation:  -     Publication Date:  2012 Jan 
Date Detail:
Created Date:  2012-1-16     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8505245     Medline TA:  Magn Reson Med     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012 Wiley Periodicals, Inc.
Affiliation:
UR370 QuaPA, INRA, F-63122 Saint Genès Champanelle, France.
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