Human imaging at 9.4 T using T(2) *-, phase-, and susceptibility-weighted contrast

Area of Science:

• Neuroimaging
• Magnetic Resonance Imaging (MRI)
• Biophysics

Background:

• Susceptibility effects in MRI increase with field strength, influencing image contrast.
• Local field variations impact T(2)* relaxation times and image phase.
• Susceptibility-weighted imaging (SWI) is effective for visualizing veins and deep brain structures.

Purpose of the Study:

• To investigate the utility of three contrast mechanisms (T(2)*, phase, and SWI) at 9.4 T.
• To assess the impact of high field strength on anatomical detail and contrast.
• To identify previously unseen brain structures at ultra-high field.

Main Methods:

• Utilized 9.4 T MRI scanner.
• Acquired T(2)* maps, phase images, and susceptibility-weighted images.
• Analyzed contrast mechanisms for anatomical visualization.

Main Results:

• T(2)* maps revealed white matter structures invisible in conventional MRI.
• Phase images achieved 130 μm resolution, showing high gray/white matter contrast and cortical structures.
• Susceptibility-weighted images provided excellent visibility of small veins at 175 μm resolution.

Conclusions:

• 9.4 T MRI significantly enhances susceptibility-based contrast mechanisms.
• High-resolution T(2)*, phase, and SWI imaging at 9.4 T offer superior visualization of brain anatomy.
• These advanced MRI techniques hold promise for detailed neuroanatomical studies.