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Related Concept Videos

Magnetic Resonance Imaging01:24

Magnetic Resonance Imaging

Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...
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Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...

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Rapid Scan Electron Paramagnetic Resonance Opens New Avenues for Imaging Physiologically Important Parameters In Vivo
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Functional magnetic resonance imaging using PROPELLER-EPI.

Martin Krämer1, Thies H Jochimsen, Jürgen R Reichenbach

  • 1Medical Physics Group, Department of Diagnostic and Interventional Radiology I, Jena University Hospital, Philosophenweg 3, D-07743 Jena, Germany. martinkraemer@gmx.net

Magnetic Resonance in Medicine
|December 7, 2011
PubMed
Summary
This summary is machine-generated.

Periodically rotated overlapping parallel lines with enhanced reconstruction-echo-planar imaging (PROPELLER-EPI) offers a novel approach to functional MRI. This technique provides comparable results to single-shot EPI, enabling advanced reconstruction methods.

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Neuroimaging Techniques

Background:

  • Functional MRI (fMRI) relies on detecting signal changes within the brain.
  • Standard single-shot Echo-Planar Imaging (EPI) is widely used but has limitations.
  • Advanced k-space sampling strategies are needed to improve fMRI data acquisition.

Purpose of the Study:

  • To evaluate the efficacy of Periodically Rotated Overlapping Parallel Lines with Enhanced Reconstruction-Echo-Planar Imaging (PROPELLER-EPI) for fMRI.
  • To explore the potential of PROPELLER-EPI for advanced reconstruction techniques like keyhole imaging.
  • To compare the fMRI performance of PROPELLER-EPI with conventional single-shot EPI.

Main Methods:

  • PROPELLER-EPI employs a multishot technique, acquiring narrow blades of k-space that are rotated sequentially.
  • Each acquired blade continuously refreshes the center of k-space, crucial for detecting signal changes.
  • Integration with fast gradient-echo readout enables high spatial and temporal resolutions suitable for fMRI.

Main Results:

  • PROPELLER-EPI samples the k-space center with every shot, enhancing signal change detection.
  • The technique supports sliding-window and keyhole reconstruction methods.
  • Functional data acquired using an interlaced PROPELLER-EPI sequence showed comparable fMRI results to single-shot EPI.

Conclusions:

  • PROPELLER-EPI presents distinct spatiotemporal characteristics compared to single-shot EPI.
  • Its ability to enable keyhole reconstruction makes it a promising alternative for various fMRI applications.
  • PROPELLER-EPI offers a valuable advancement in fMRI acquisition and analysis.