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Ultrashort echo time (UTE) imaging using gradient pre-equalization and compressed sensing.

Hilary T Fabich1, Martin Benning1, Andrew J Sederman1

  • 1Department of Chemical Engineering and Biotechnology, University of Cambridge, New Museums Site, Pembroke Street, Cambridge CB2 3RA, United Kingdom.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|July 19, 2014
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Summary
This summary is machine-generated.

This study introduces ultrashort echo time (UTE) imaging for non-medical uses, enabling faster scans and accurate imaging of materials like cork and rubber. Compressed sensing allows high-quality images with minimal data, potentially enabling real-time imaging of short T2(*) materials.

Keywords:
Compressed sensingGradient pre-equalizationMRIUTEUltrashort echo time

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Area of Science:

  • Materials Science
  • Medical Imaging Physics

Background:

  • Ultrashort echo time (UTE) imaging is established in medical MRI but complex to implement.
  • Non-trivial implementation challenges exist for UTE sequences.

Purpose of the Study:

  • Introduce UTE for non-medical applications.
  • Develop a method for accurate slice selection and reduced acquisition times in UTE.
  • Enable imaging of materials with short signal lifetimes.

Main Methods:

  • Gradient pre-equalization technique for optimized gradient switching.
  • Radial k-space sampling to minimize echo time.
  • Compressed sensing for reduced total acquisition time.
  • Novel image reconstruction techniques.

Main Results:

  • Achieved an effective echo time of 10μs.
  • Demonstrated UTE viability for studying cork and rubber samples with short signal lifetimes.
  • Compressed sensing provided accurate images using only 12.5% of full k-space data.

Conclusions:

  • UTE is a viable technique for non-medical applications, including materials with short T2(*) relaxation times.
  • Compressed sensing significantly reduces acquisition time, enabling potential real-time imaging.
  • The developed method allows accurate slice selection and fast data acquisition.