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Magnetic Resonance Imaging of Multiple Sclerosis at 7.0 Tesla

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Published on: February 19, 2021

Rapid 3D radial multi-echo functional magnetic resonance imaging.

Gregory R Lee¹, Mark A Griswold, Jean A Tkach

¹Department of Radiology, School of Medicine, Case Western Reserve University/University Hospitals Case Medical Center, Cleveland, Ohio 44106, USA.

|May 11, 2010

Summary

A new multi-shot 3D radial acquisition enables rapid whole-brain functional magnetic resonance imaging (fMRI) at multiple echo times. This technique improves sensitivity and signal-to-noise ratio for BOLD contrast, enhancing activation map detection.

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Area of Science:

Magnetic Resonance Imaging
Neuroimaging
Biophysics

Background:

Functional magnetic resonance imaging (fMRI) benefits from multiple echo times (TEs) for optimizing sensitivity and T2* quantification.
Single-shot echo-planar imaging (EPI) is limited by long readout durations, restricting the number and minimum value of TEs achievable within a single TR.

Purpose of the Study:

To introduce a novel multi-shot 3D radial acquisition technique for rapid whole-brain fMRI.
To enable flexible trade-offs between temporal resolution and Blood-Oxygen-Level-Dependent (BOLD) contrast-to-noise ratio (CNR).

Main Methods:

A multi-shot 3D radial acquisition strategy using a series of 2D interleaf rotations for k-space coverage.
Reconstruction of data at various temporal resolutions from a single acquired dataset.
Acquisition of whole-brain images at 5 echo times (10-46 ms) with a temporal rate of 400 ms/volume at 3.75 mm isotropic resolution.

Main Results:

Demonstrated rapid whole-brain imaging capability with multiple echo times.
Obtained consistent activation maps for a simultaneous motor/visual task across different acceleration factors.
Showed that weighted combination of echoes significantly improved Z-scores compared to individual echo time images (p=0.016).

Conclusions:

The proposed multi-shot 3D radial acquisition is a viable method for fast, multi-TE whole-brain fMRI.
This technique enhances BOLD signal detection and provides flexibility in imaging parameters.
Improved activation map sensitivity is achieved through optimal combination of multi-echo data.