Ready for Routine: Homogeneous, High-Resolution, and Multicontrast Whole-Brain MRI at 7 Tesla in Short Scan Time With...

Area of Science:

• Neuroimaging
• Magnetic Resonance Imaging (MRI)

Background:

• 7T MRI offers advanced imaging but faces challenges with field inhomogeneities and long scan times, limiting clinical adoption.
• These limitations hinder whole-brain coverage and high-resolution imaging in routine practice.

Purpose of the Study:

• To develop and validate a calibration-free parallel transmit (pTx) technique using universal pulses (UPs) for homogenous multicontrast 7T MRI.
• The goal is to achieve whole-brain coverage, high spatial resolution, and short scan times for clinical applications.

Main Methods:

• Custom MRI sequences utilizing pTx with UPs were developed and compared to conventional sequences in 10 healthy volunteers.
• Anatomical and quantitative MRI protocols (MPM, CEST) were evaluated for image quality, homogeneity, and scan time.
• The optimized protocol was demonstrated in 4 patients with various neurological diseases.

Main Results:

• Custom sequences with UPs significantly improved image homogeneity, quality, SNR, and CNR across the entire brain compared to conventional methods.
• UPs enhanced the repeatability of quantitative MRI parameters.
• Successful demonstration in patients with epilepsy, ataxia, angiopathy, and glioblastoma confirmed clinical applicability.

Conclusions:

• Homogeneous whole-brain 7T MRI with high resolution and quality is achievable within clinically feasible scan times.
• The developed protocol is user-friendly and ready for clinical implementation, potentially increasing 7T MRI adoption in neuroradiology.