A 4-minute solution for submillimeter whole-brain T_1ρ quantification.

Area of Science:

• Magnetic Resonance Imaging (MRI)
• Quantitative Imaging
• Neuroimaging

Background:

• T1ρ (T1rho) quantification is valuable for in vivo brain imaging.
• Current methods are often time-consuming, limiting whole-brain coverage.
• Accelerated imaging techniques are needed for robust and accurate T1ρ mapping.

Purpose of the Study:

• To develop a robust, accurate, and accelerated T1ρ quantification solution.
• To achieve submillimeter in vivo whole-brain imaging.
• To enable rapid T1ρ mapping for potential clinical applications.

Main Methods:

• Developed a multislice T1ρ mapping (MS-T1ρ) solution using turbo spin echo with RF cycling.
• Employed compressed sensing (SCOPE) for accelerated acquisition, achieving a 3 min 31 sec scan time.
• Validated accuracy with phantom studies and robustness with in vivo scans of 13 volunteers.

Main Results:

• MS-T1ρ demonstrated excellent agreement with reference T1ρ values in phantom studies (R² = 0.9991).
• High consistency was observed across all slices (coefficient of variation = 2.2 ± 2.43%).
• In vivo scans showed no artifacts, with no significant differences in T1ρ values compared to fully sampled acquisitions.

Conclusions:

• The proposed MS-T1ρ solution enables high-resolution whole-brain T1ρ mapping in under 4 minutes.
• This accelerated method offers a potential tool for investigating neurological diseases.
• The technique provides accurate and robust T1ρ quantification for comprehensive brain analysis.