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Ultrashort echo time and zero echo time MRI at 7T.

Peder E Z Larson1,2,3, Misung Han4, Roland Krug4

  • 1Department of Radiology and Biomedical Imaging, University of California - San Francisco, Byers Hall, Rm 102C, 1700 4th St, San Francisco, CA, 94158, USA. peder.larson@ucsf.edu.

Magma (New York, N.Y.)
|December 26, 2015
PubMed
Summary

Zero echo time (ZTE) and ultrashort echo time (UTE) MRI sequences show similar performance for imaging short-T2 tissues at 7T. ZTE offers lower acoustic noise, while UTE provides greater flexibility but has higher noise and gradient sensitivity.

Keywords:
Magnetic resonance imagingMusculoskeletal systemNeuroimaging

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Biophysics
  • Medical Imaging Technology

Background:

  • Zero echo time (ZTE) and ultrashort echo time (UTE) pulse sequences in MRI are crucial for detecting signals from rapidly decaying short-T2 tissue components.
  • These advanced MRI techniques offer unique advantages over conventional methods for specific tissue characterization.

Purpose of the Study:

  • To compare the performance and identify differences between 3D ZTE and UTE pulse sequences at 7 Tesla (7T) for MRI.
  • To assess the ability of ZTE and UTE sequences to detect and characterize ultrashort, short, and long T2 tissues.

Main Methods:

  • Matched ZTE and UTE pulse sequences for readout trajectories and image contrast at 7T.
  • Utilized water- and fat-suppressed solid-state proton projection imaging for ZTE k-space center filling.
  • Acquired images from healthy volunteers and performed qualitative comparisons alongside signal-to-noise (SNR) and contrast-to-noise (CNR) measurements.

Main Results:

  • Achieved nearly identical CNR/SNR for ultrashort, short, and long-T2 components in the brain, knee, and ankle within similar scan times.
  • Observed gradient fidelity artifacts in UTE and shading artifacts in ZTE, both correctable with advanced reconstruction or protocol adjustments.

Conclusions:

  • 3D ZTE and UTE pulse sequences demonstrate comparable contrast and SNR efficiency for volumetric imaging of ultrashort-T2 components at 7T.
  • ZTE is limited to volumetric imaging but significantly reduces acoustic noise; UTE offers greater flexibility but exhibits higher acoustic noise and gradient sensitivity.