@article{ganter_b1-mapping_2013,
	title = {B1+-mapping with the transient phase of unbalanced steady-state free precession: {B} $^{\textrm{+}}$ $_{\textrm{1}}$ -{Mapping} {With} {Transient} {Phase} {SSFP}},
	volume = {70},
	issn = {07403194},
	shorttitle = {B1+-mapping with the transient phase of unbalanced steady-state free precession},
	url = {http://doi.wiley.com/10.1002/mrm.24598},
	doi = {10.1002/mrm.24598},
	abstract = {Purpose: A novel Bþ1 -mapping technique (B1-TRAP) is presented, which derives the actual flip angle from the frequency of signal oscillations, observed in the transient phase of unbalanced steady-state free precession sequences. Theory: For short repetition times (TR), the angular frequency of distinct oscillations in the transient phase of steady-state free precession sequences is proven to be approximately proportional to the actual flip angle: v Á TR \% a. The result is not influenced by off-resonance and it can be shown that deviations are only of second order in the small parameter TR=T2.
Methods: B1-TRAP makes use of this effect through a frequency analysis of the transient phase of a train of steadystate free precession signals.
Results: In terms of reliability and time efficiency, a twodimensional multislice implementation was found to be optimal. Unlike many steady-state Bþ1 -mapping methods, the accuracy of B1-TRAP was not impaired by imperfect slice profiles.
Conclusion: Simulations, phantom, and in vivo measurements showed that B1-TRAP offers a good compromise with respect to speed, robustness, and accuracy. Magn Reson Med 70:1515–1523, 2013. VC 2013 Wiley Periodicals, Inc.},
	language = {en},
	number = {6},
	urldate = {2021-02-12},
	journal = {Magnetic Resonance in Medicine},
	author = {Ganter, Carl and Settles, Marcus and Dregely, Isabel and Santini, Francesco and Scheffler, Klaus and Bieri, Oliver},
	month = dec,
	year = {2013},
	pages = {1515--1523},
}

{"_id":"hGe8R256ywQemXmKh","bibbaseid":"ganter-settles-dregely-santini-scheffler-bieri-b1mappingwiththetransientphaseofunbalancedsteadystatefreeprecessionbtextrmtextrm1mappingwithtransientphasessfp-2013","author_short":["Ganter, C.","Settles, M.","Dregely, I.","Santini, F.","Scheffler, K.","Bieri, O."],"bibdata":{"bibtype":"article","type":"article","title":"B1+-mapping with the transient phase of unbalanced steady-state free precession: B $^{\\textrm{+}}$ $_{\\textrm{1}}$ -Mapping With Transient Phase SSFP","volume":"70","issn":"07403194","shorttitle":"B1+-mapping with the transient phase of unbalanced steady-state free precession","url":"http://doi.wiley.com/10.1002/mrm.24598","doi":"10.1002/mrm.24598","abstract":"Purpose: A novel Bþ1 -mapping technique (B1-TRAP) is presented, which derives the actual flip angle from the frequency of signal oscillations, observed in the transient phase of unbalanced steady-state free precession sequences. Theory: For short repetition times (TR), the angular frequency of distinct oscillations in the transient phase of steady-state free precession sequences is proven to be approximately proportional to the actual flip angle: v Á TR % a. The result is not influenced by off-resonance and it can be shown that deviations are only of second order in the small parameter TR=T2. Methods: B1-TRAP makes use of this effect through a frequency analysis of the transient phase of a train of steadystate free precession signals. Results: In terms of reliability and time efficiency, a twodimensional multislice implementation was found to be optimal. Unlike many steady-state Bþ1 -mapping methods, the accuracy of B1-TRAP was not impaired by imperfect slice profiles. Conclusion: Simulations, phantom, and in vivo measurements showed that B1-TRAP offers a good compromise with respect to speed, robustness, and accuracy. Magn Reson Med 70:1515–1523, 2013. VC 2013 Wiley Periodicals, Inc.","language":"en","number":"6","urldate":"2021-02-12","journal":"Magnetic Resonance in Medicine","author":[{"propositions":[],"lastnames":["Ganter"],"firstnames":["Carl"],"suffixes":[]},{"propositions":[],"lastnames":["Settles"],"firstnames":["Marcus"],"suffixes":[]},{"propositions":[],"lastnames":["Dregely"],"firstnames":["Isabel"],"suffixes":[]},{"propositions":[],"lastnames":["Santini"],"firstnames":["Francesco"],"suffixes":[]},{"propositions":[],"lastnames":["Scheffler"],"firstnames":["Klaus"],"suffixes":[]},{"propositions":[],"lastnames":["Bieri"],"firstnames":["Oliver"],"suffixes":[]}],"month":"December","year":"2013","pages":"1515–1523","bibtex":"@article{ganter_b1-mapping_2013,\n\ttitle = {B1+-mapping with the transient phase of unbalanced steady-state free precession: {B} $^{\\textrm{+}}$ $_{\\textrm{1}}$ -{Mapping} {With} {Transient} {Phase} {SSFP}},\n\tvolume = {70},\n\tissn = {07403194},\n\tshorttitle = {B1+-mapping with the transient phase of unbalanced steady-state free precession},\n\turl = {http://doi.wiley.com/10.1002/mrm.24598},\n\tdoi = {10.1002/mrm.24598},\n\tabstract = {Purpose: A novel Bþ1 -mapping technique (B1-TRAP) is presented, which derives the actual flip angle from the frequency of signal oscillations, observed in the transient phase of unbalanced steady-state free precession sequences. Theory: For short repetition times (TR), the angular frequency of distinct oscillations in the transient phase of steady-state free precession sequences is proven to be approximately proportional to the actual flip angle: v Á TR \\% a. The result is not influenced by off-resonance and it can be shown that deviations are only of second order in the small parameter TR=T2.\nMethods: B1-TRAP makes use of this effect through a frequency analysis of the transient phase of a train of steadystate free precession signals.\nResults: In terms of reliability and time efficiency, a twodimensional multislice implementation was found to be optimal. Unlike many steady-state Bþ1 -mapping methods, the accuracy of B1-TRAP was not impaired by imperfect slice profiles.\nConclusion: Simulations, phantom, and in vivo measurements showed that B1-TRAP offers a good compromise with respect to speed, robustness, and accuracy. Magn Reson Med 70:1515–1523, 2013. 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