Fast CT-PRESS-based spiral chemical shift imaging at 3 Tesla

Area of Science:

• Magnetic Resonance Imaging
• Spectroscopy
• Neuroimaging

Background:

• Multivoxel magnetic resonance spectroscopy (MRS) is crucial for non-invasive metabolite quantification in the brain.
• Existing techniques often face challenges with acquisition time, resolution, and spectral quality.
• Advanced pulse sequences are needed to overcome these limitations for clinical applications.

Purpose of the Study:

• To develop and validate a novel MRS sequence combining CT-PRESS and fast spiral chemical shift imaging.
• To achieve rapid acquisition of multivoxel spectra with high in-plane resolution and minimal line splitting.
• To assess the feasibility of detecting key brain metabolites within a clinically relevant timeframe.

Main Methods:

• Implementation of a novel sequence integrating constant-time point-resolved spectroscopy (CT-PRESS) with fast spiral chemical shift imaging.
• Acquisition of multivoxel spectra with a minimum total measurement time under 5 minutes.
• In-plane resolution of 1.5x1.5 cm2 within a 24 cm field of view.
• Utilized 17 CS encoding steps in t1 (Δt1=12.8 ms) and an average echo time of 151 ms.

Main Results:

• Successful acquisition of multivoxel spectra with minimal line splitting and baseline distortions.
• Detection of key metabolites including N-acetyl-aspartate, total creatine, choline-containing compounds (Cho), glutamate (Glu), and myo-inositol (mI).
• Demonstrated feasibility in a healthy volunteer within 14 minutes on a 3 T MR scanner.

Conclusions:

• The novel CT-PRESS and fast spiral sequence enables rapid, high-quality multivoxel MRS.
• This technique shows promise for efficient in vivo brain metabolite analysis.
• Further validation may lead to improved diagnostic capabilities in neurological conditions.