Characterization of normal appearing brain structures using high-resolution quantitative magnetization transfer...

Area of Science:

• Neuroimaging
• Medical Physics
• Biophysics

Background:

• Quantitative Magnetization Transfer (qMT) imaging is vital for characterizing brain tissue properties.
• Standard spoiled gradient echo (SPGR) methods have limitations in resolution and acquisition time for qMT.
• Balanced steady-state free precession (bSSFP) offers potential for improved qMT imaging.

Purpose of the Study:

• To acquire 3D high-resolution qMT data using bSSFP.
• To establish standardized qMT values for various brain structures.
• To create a baseline for future characterization of brain pathologies.

Main Methods:

• Utilized MT-sensitized bSSFP to acquire 3D qMT data.
• Assessed qMT parameters (F, kf, T1, T2) in 12 white matter (WM) and 11 grey matter (GM) structures.
• Scanned 12 healthy volunteers.

Main Results:

• bSSFP provided high-resolution, high SNR qMT images in feasible times.
• qMT values generally agreed with previous SPGR studies, with expected WM/GM differences.
• High-resolution bSSFP revealed significant regional differences within WM and GM structures, reducing partial volume effects.

Conclusions:

• MT-sensitized bSSFP is ideal for clinical qMT analysis due to high-resolution 3D data acquisition in feasible times.
• The generated qMT data can serve as a reference for characterizing cerebral diseases.
• bSSFP enables assessment of small brain structures, overcoming limitations of previous methods.