C-FLAIR: Fluid-attenuated Inversion Recovery with Controlled Artifact Suppression in Brain MRI

Area of Science:

• Radiology
• Medical Imaging
• Magnetic Resonance Imaging

Background:

• Routine brain MRI utilizes T2-weighted fluid-attenuated inversion recovery (FLAIR) sequences.
• Field inhomogeneities (B0 and RF) can cause artifacts, obscuring or mimicking pathologies.
• Optimized inversion pulses are needed to improve FLAIR image quality.

Purpose of the Study:

• To develop and evaluate an optimized FLAIR inversion pulse robust to B0 and RF field inhomogeneities.
• The goal is to reduce artifacts and improve diagnostic accuracy in brain MRI.

Main Methods:

• A prospective study employed optimal control to design a FLAIR inversion pulse (C-FLAIR).
• Images were acquired at 3T in a phantom and 14 participants (healthy, MS, concussion, WWH).
• Visual assessment of signal suppression, artifacts, and lesion visibility was performed by a radiologist. SNR and CNR were computed in healthy volunteers.

Main Results:

• C-FLAIR demonstrated near-perfect inversion, removing artifacts caused by field inhomogeneities.
• Image contrast for multiple sclerosis lesions and white matter hyperintensities remained identical to conventional FLAIR.
• No significant differences in mean SNR or CNR were observed between FLAIR and C-FLAIR.

Conclusions:

• Controlled FLAIR (C-FLAIR) effectively eliminates artifacts from incomplete inversion due to field inhomogeneities.
• The C-FLAIR sequence maintains diagnostic image contrast for key brain pathologies.
• This optimized pulse offers improved image quality in routine brain MRI protocols.