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A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
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Fast B1 Mapping Based on Double-Angle Method with T1 Correction Using Standard Pulse Sequence.

Yoshiyuki Ishimori1, Takeshi Shimanuki2, Tomoya Kobayashi1

  • 1Department of Radiological Sciences, Ibaraki Prefectural University of Health Sciences, Kashiwa, Japan.

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|May 13, 2022
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Summary
This summary is machine-generated.

This study combines the double-angle method (DAM) with T1 correction for accurate radiofrequency (RF) field (B1) mapping. This approach significantly reduces acquisition time to under 25 seconds, improving MRI efficiency.

Keywords:
B1 mapT1 correctiondouble-angle methodflip angleradio frequency

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Biophysics
  • Medical Physics

Background:

  • Accurate radiofrequency (RF) field (B1) mapping is crucial for quantitative MRI.
  • Existing methods like the double-angle method (DAM) can be sensitive to T1 relaxation effects.
  • Short repetition times (TR) in fast imaging sequences exacerbate these T1-related inaccuracies.

Purpose of the Study:

  • To investigate the efficacy of combining the double-angle method (DAM) with T1 correction for improved B1 mapping.
  • To assess the impact of T1 correction on the accuracy of B1 estimation.
  • To evaluate the potential for reducing MRI acquisition time using this combined method.

Main Methods:

  • Signal intensities were acquired using flip angles α and 2α at short TR.
  • T1 correction was applied to convert signals to those expected at TR=∞.
  • T1 values were preliminarily measured using the saturation recovery (SR) method with varying TRs.
  • A 2D gradient echo echo-planar imaging sequence was employed.
  • Experiments were validated using CuSO4-doped water phantoms to study imaging parameter effects.

Main Results:

  • T1 values measured by the 2-SR method were found to be underestimated compared to the multipoint inversion recovery method.
  • The T1-corrected DAM achieved a flip angle (FA) error of less than 5% with optimized imaging parameters.
  • The combined method enabled a significant reduction in acquisition time to under 25 seconds.

Conclusions:

  • T1 correction effectively enhances the accuracy of B1 mapping when combined with the double-angle method.
  • The T1-corrected DAM offers a faster and more precise alternative for B1 field estimation in MRI.
  • This technique holds promise for accelerating quantitative MRI protocols without compromising accuracy.