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Concurrent EEG and Functional MRI Recording and Integration Analysis for Dynamic Cortical Activity Imaging
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Spatial specificity in spatiotemporal encoding and Fourier imaging.

Ute Goerke1

  • 1CMRR and Radiology, University of Minnesota, Minneapolis, MN, USA.

Magnetic Resonance Imaging
|December 30, 2015
PubMed
Summary
This summary is machine-generated.

A novel apparent point-spread function (PSF) is proposed for ultrafast spatiotemporal encoding (SPEN) imaging, overcoming limitations of conventional PSF definitions in these techniques.

Keywords:
Frequency-swept pulseMagnetic resonance imaging (MRI)Point-spread-functionRASERSpatiotemporal encodingUltrahigh magnetic field

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Area of Science:

  • Magnetic Resonance Imaging
  • Ultrafast Imaging Techniques
  • Spatiotemporal Encoding (SPEN)

Background:

  • Spatiotemporal encoding (SPEN) imaging, including rapid acquisition with sequential excitation and refocusing (RASER), offers robustness against magnetic field variations, unlike echo-planar imaging (EPI).
  • Conventional methods struggle to accurately describe the point-spread function (PSF) in SPEN imaging due to signal attenuation related to spatial phase dispersion.

Purpose of the Study:

  • To introduce a novel definition for an apparent point-spread function (PSF) tailored for SPEN imaging techniques.
  • To address the limitations of existing PSF definitions in characterizing SPEN imaging performance.

Main Methods:

  • Theoretical derivations were developed to define the apparent PSF.
  • Bloch simulations and experimental validation were employed to confirm the theoretical findings.

Main Results:

  • The apparent PSF quantifies magnetization contribution to a voxel's signal based on distance.
  • This contrasts with the conventional PSF, which measures signal intensity at different locations.

Conclusions:

  • The conventional PSF definition is inadequate for SPEN imaging because it primarily considers signal amplitude, not phase variations.
  • The proposed apparent PSF concept is generalizable and applicable to conventional Fourier-imaging techniques as well.