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Silent T1 mapping using the variable flip angle method with B1 correction.

Emil Ljungberg1, Tobias Wood1, Ana Beatriz Solana2

  • 1Department of Neuroimaging, Institute of Psychiatry, Psychology & Neuroscience, King's College London, London, UK.

Magnetic Resonance in Medicine
|January 22, 2020
PubMed
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This summary is machine-generated.

Silent rotating ultrafast imaging sequence (RUFIS) offers a feasible alternative for silent variable flip angle (VFA) T1 mapping. This novel silent approach demonstrates comparable repeatability and improved reproducibility compared to traditional SPGR methods, with no significant acoustic noise increase.

Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Quantitative Imaging
  • Biomedical Engineering

Background:

  • Traditional spoiled gradient-echo (SPGR) acquisition for variable flip angle (VFA) T1 mapping is susceptible to acoustic noise.
  • Developing silent MRI techniques is crucial for patient comfort and reducing motion artifacts.

Purpose of the Study:

  • To compare the performance of a silent rotating ultrafast imaging sequence (RUFIS) against the standard Cartesian SPGR for VFA T1 mapping.
  • To evaluate the feasibility of a completely silent T1 mapping protocol using RUFIS and a novel silent magnetization prepared T1 map acquisition (SIMBA).

Main Methods:

  • Two-point VFA measurements were acquired using both RUFIS and Cartesian SPGR in a phantom and healthy volunteers.
  • A novel silent magnetization prepared T1 map acquisition (SIMBA) was developed to correct for T1 errors.
Keywords:
MRIZTEquantitativesilent

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  • The RUFIS-VFA and SIMBA combination enabled a fully silent T1 mapping protocol.

    • Main Results:

    • The silent RUFIS protocol exhibited comparable repeatability to the standard SPGR protocol.
    • In vivo, the silent RUFIS protocol demonstrated higher reproducibility than the SPGR protocol.
    • The SPGR acquisition increased acoustic noise by 33 dBA, whereas the silent protocol showed no significant increase above background noise.

    Conclusions:

    • Variable flip angle (VFA) T1 mapping using RUFIS is a viable alternative to SPGR.
    • The RUFIS-based method achieves silent T1 mapping with comparable acquisition times.
    • This silent approach offers improved patient comfort and potentially reduced motion artifacts in quantitative MRI.