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Ramped hybrid encoding for improved ultrashort echo time imaging.

Hyungseok Jang1,2, Curtis N Wiens1, Alan B McMillan1

  • 1Department of Radiology, Wisconsin Institute for Medical Research, University of Wisconsin, Madison, Wisconsin, USA.

Magnetic Resonance in Medicine
|September 19, 2015
PubMed
Summary

We developed ramped hybrid encoding (RHE) to shorten MRI scan times for short T2* species. This new technique improves imaging capabilities and spatial resolution for ultrashort T2* imaging.

Keywords:
PETRAUTEZTEgradient calibrationhybrid encodingsingle point imaging

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Area of Science:

  • Magnetic Resonance Imaging
  • Biomedical Engineering

Background:

  • Imaging short T2* species is challenging due to rapid signal decay.
  • Existing methods have limitations in encoding duration and spatial resolution.

Purpose of the Study:

  • To introduce a novel acquisition technique, ramped hybrid encoding (RHE).
  • To minimize per-excitation encoding duration for improved imaging of short T2* species.

Main Methods:

  • RHE applies gradients before RF excitation and rapidly ramps them post-excitation.
  • A hybrid encoding scheme similar to PETRA acquires central k-space data.
  • A gradient calibration method using single-point imaging ensures robust reconstruction.

Main Results:

  • RHE achieves the shortest per-excitation encoding time for ultrashort T2* imaging.
  • Highest spatial resolution among ultrashort T2* imaging methods was demonstrated.
  • Phantom and in vivo experiments showed robust imaging with minimal artifacts.

Conclusions:

  • RHE significantly alleviates the impact of fast T2* decay during encoding.
  • The technique enables improved spatial resolution in ultrashort T2* imaging.