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Develop and validate an accelerated in vivo multislice MRI technique to accurately measure the active B1 field while reducing repetition time.

Imaging of the active B₁ field in vivo

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Develop and validate an accelerated in vivo multislice MRI technique to accurately measure the active B1 field while reducing repetition time.
Incorporated a compensating radiofrequency pulse into a dual-excitation-angle ratio sequence to suppress T1 relaxation effects and shorten scan time.
Evaluated the impact of slice-selective excitation and magnetization transfer through numerical simulations, phantom tests, and in vivo acquisitions.
Compensating radiofrequency pulses effectively suppressed T1 dependence, maintaining high measurement stability and accuracy in phantom and human scans.
Successfully mapped the active B1 field across 23 cross-sectional slices in vivo in under 6 minutes.

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Experimental study demonstrates rapid multislice active B1 field mapping in vivo, indicating a reliable approach for fast radiofrequency calibration.

Stollberger et al. (1996) studied this question.

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Experimental study demonstrates rapid multislice active B1 field mapping in vivo, indicating a reliable approach for fast radiofrequency calibration.