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Improved echo volumar imaging (EVI) for functional MRI.

Wietske van der Zwaag1, Susan Francis, Richard Bowtell

  • 1Sir Peter Mansfield Magnetic Resonance Centre, School of Physics and Astronomy, University of Nottingham, Nottingham, UK.

Magnetic Resonance in Medicine
|November 8, 2006
PubMed
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This study enhances Echo Volumar Imaging (EVI) for functional MRI (fMRI) by reducing distortions and improving temporal resolution. The modified EVI sequence achieves high-quality fMRI data acquisition with a temporal resolution of 167 ms.

Area of Science:

  • Magnetic Resonance Imaging
  • Neuroimaging
  • Medical Physics

Background:

  • Echo Volumar Imaging (EVI) is a 3D MRI technique offering rapid volumetric data acquisition, beneficial for functional MRI (fMRI).
  • Traditional EVI is limited in fMRI applications due to susceptibility-induced distortions caused by long sampling times, stemming from gradient hardware constraints.
  • Few studies have explored EVI for fMRI, highlighting a need for sequence optimization.

Purpose of the Study:

  • To modify the Echo Volumar Imaging (EVI) sequence to enhance its suitability for functional MRI (fMRI) applications.
  • To overcome limitations of traditional EVI, specifically susceptibility-induced distortions and temporal resolution constraints.
  • To demonstrate the feasibility of acquiring high-temporal-resolution fMRI data using the optimized EVI sequence.

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Main Methods:

  • Modified the EVI sequence by incorporating a high gradient-switching frequency, reducing the number of echoes, and implementing outer volume suppression (OVS).
  • Utilized rewind gradients to mitigate Nyquist ghosting artifacts.
  • Employed a calibration scan for phase correction to further reduce ghosting and image distortion.

Main Results:

  • Successfully reduced the sampling time of the EVI sequence.
  • Demonstrated effective amelioration of Nyquist ghosting and susceptibility-induced distortions.
  • Achieved a high temporal resolution of 167 ms for fMRI data acquisition using the modified EVI sequence.

Conclusions:

  • The modified EVI sequence significantly improves image quality and temporal resolution for fMRI.
  • This optimized EVI technique offers a promising advancement for functional neuroimaging.
  • The enhanced EVI sequence enables efficient and high-fidelity fMRI data acquisition.