B1+-mapping with the transient phase of unbalanced steady-state free precession: B $^{\textrm{+}}$ $_{\textrm{1}}$ -Mapping With Transient Phase SSFP. Ganter, C., Settles, M., Dregely, I., Santini, F., Scheffler, K., & Bieri, O. Magnetic Resonance in Medicine, 70(6):1515–1523, December, 2013.
Paper doi abstract bibtex 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.
@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},
}
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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. 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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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