Dynamic and high-resolution metabolic imaging of hyperpolarized [1-13C]-pyruvate in the rat brain using a...

Area of Science:

• Magnetic Resonance Imaging
• Metabolic Imaging
• Hyperpolarized Contrast Agents

Background:

• Fast chemical shift imaging (CSI) is crucial for metabolic imaging of hyperpolarized compounds due to their short signal duration.
• Reducing acquisition time in hyperpolarized imaging may not compromise signal-to-noise ratio as seen in thermal equilibrium imaging.

Purpose of the Study:

• To enhance imaging speed and spatial resolution for hyperpolarized (13)C metabolic imaging.
• To apply advanced CSI techniques on a clinical 3T MR scanner.
• To enable detailed metabolic studies in vivo.

Main Methods:

• Utilized a high-performance gradient insert with undersampled spiral CSI.
• Implemented single-shot (125 ms) and three-shot (1.5 mm resolution) sequences.
• Measured k-space trajectories for accurate image reconstruction.
• Applied the technique to hyperpolarized [1-(13)C]-pyruvate metabolic imaging in rat brains.

Main Results:

• Achieved increased imaging speed and spatial resolution for hyperpolarized (13)C metabolic imaging.
• Demonstrated dynamic imaging for region-of-interest-specific metabolic time courses.
• Enabled high-resolution imaging to characterize metabolite distribution.

Conclusions:

• The developed fast CSI technique effectively improves hyperpolarized (13)C metabolic imaging on a clinical scanner.
• This method allows for both rapid dynamic monitoring and high-resolution spatial characterization of metabolites.
• It holds promise for advanced in vivo metabolic research, particularly in neuroscience.