Three-dimensional spiral fMRI technique: a comparison with 2D spiral acquisition

Area of Science:

• Neuroimaging
• Magnetic Resonance Imaging (MRI)
• Functional MRI (fMRI)

Background:

• Functional MRI (fMRI) is crucial for mapping brain activity.
• Spiral k-space techniques offer rapid data acquisition in fMRI.
• Comparing 3D and 2D spiral sequences is essential for optimizing fMRI performance.

Purpose of the Study:

• To compare the performance of 3D and 2D spiral k-space fMRI techniques.
• To evaluate image quality, signal-to-noise ratio (SNR), and functional contrast-to-noise ratio (fCNR).
• To assess the utility of 3D spiral fMRI for detecting brain activation.

Main Methods:

• A 4.25-minute finger-tapping task paradigm was employed.
• Comparison of 3D and 2D spiral k-space fMRI sequences using Blood Oxygen Level-Dependent (BOLD) contrast.
• Analysis included image appearance, SNR, fluctuation noise, fCNR, activation areas, inflow effect, and large vessel involvement.

Main Results:

• The 3D spiral acquisition demonstrated higher SNR and fCNR than the 2D sequence.
• Although fluctuation noise was slightly higher in 3D, the overall image quality was improved.
• 3D spiral fMRI allows for thin-slice incoherent averaging, offering an advantage over 2D.

Conclusions:

• The 3D spiral fMRI technique exhibits superior performance characteristics compared to 2D spiral fMRI.
• Advantages include higher SNR, fCNR, and the capability for thin-slice averaging.
• 3D spiral fMRI holds potential for improved brain activity mapping and clinical applications.