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Multislice interleaved excitation cycles (MUSIC): an efficient gradient-echo technique for functional MRI
T Loenneker1, F Hennel, J Hennig
1Department of Radiology, University of Freiburg, Germany.
Magnetic Resonance in Medicine
|June 1, 1996
Summary
This study introduces an interleaved multislice excitation technique for faster gradient-echo imaging. This method improves slice efficiency, enabling rapid acquisition of functional MRI data for brain activation mapping.
Area of Science:
- Magnetic Resonance Imaging (MRI)
- Neuroimaging
- Biophysics
Background:
- Gradient-echo imaging often requires long echo times, limiting speed, especially for functional MRI (fMRI).
- Conventional single-slice techniques struggle to balance imaging time with adequate volume coverage.
- Detecting subtle susceptibility changes is crucial for mapping brain activity.
Purpose of the Study:
- To present a novel method for enhanced slice efficiency in gradient-echo MRI.
- To enable rapid, multislice functional MRI acquisition for human cortical activation studies.
- To maintain short imaging times comparable to conventional single-slice techniques.
Main Methods:
- Implementation of interleaved multislice excitation during the echo time.
- Application of the technique on clinical MR instruments at 2 Tesla and 3 Tesla.
- Demonstration using functional MRI experiments of the human visual cortex.
Main Results:
- Achieved improved slice efficiency for gradient-echo imaging with long echo times.
- Acquired fourteen 128x128 slices in 13 seconds, covering a large volume-of-interest.
- Successfully detected temporary T2* changes indicative of cortical activation.
Conclusions:
- The interleaved multislice excitation technique significantly enhances volumetric coverage in fMRI.
- This method allows for rapid acquisition of human cortical activation maps at multiple planes.
- The technique is efficient and viable on clinical MR scanners for time-sensitive neuroimaging applications.