MyocardialT₁mapping at 5T using multi-inversion recovery real-time spoiled GRE

Area of Science:

• Cardiovascular Magnetic Resonance Imaging
• Quantitative MRI
• Biomedical Engineering

Background:

• Accurate myocardial T1 mapping is crucial for diagnosing and monitoring cardiovascular diseases.
• Existing T1 mapping techniques at 5 Tesla (5T) may have limitations in accuracy and reproducibility.
• High-field MRI at 5T offers potential for improved signal-to-noise ratio and tissue characterization.

Purpose of the Study:

• To develop and validate a novel, accurate myocardial T1 mapping technique at 5T.
• To compare the performance of the proposed technique against a conventional method (MOLLI).
• To assess the feasibility and reproducibility of the new technique for clinical application.

Main Methods:

• Development of a Look-Locker-based multiple inversion-recovery technique with real-time spoiled gradient echo (GRE) acquisition (mIR-rt).
• Validation using Bloch simulations, phantom studies, and in 16 healthy volunteers at 5T.
• Comparison of T1 values obtained by mIR-rt and conventional MOLLI sequences.

Main Results:

• The mIR-rt technique demonstrated high accuracy, with errors less than 3% compared to reference values in simulations and phantoms.
• Conventional MOLLI sequence significantly underestimated myocardial T1 values compared to mIR-rt (p < 0.001).
• Reproducible myocardial T1 values were obtained with mIR-rt, particularly in middle slices, indicating practical relevance.

Conclusions:

• The proposed mIR-rt technique is a feasible and accurate method for myocardial T1 mapping at 5T.
• mIR-rt provides superior accuracy compared to conventional MOLLI sequences.
• The high reproducibility supports the clinical utility of mIR-rt for quantitative cardiac assessment at 5T.