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Optimizing trajectory ordering for fast radial ultra-short TE (UTE) acquisitions.

Xucheng Zhu1, Fei Tan2, Kevin Johnson3

  • 1UC Berkeley-UCSF Graduate Program in Bioengineering, University of California, San Francisco and University of California, Berkeley, CA, United States; Radiology and Biomedical Imaging, University of California, San Francisco, CA, United States; GE Healthcare, Menlo Park, CA, United States.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|April 19, 2021
PubMed
Summary

This study introduces a new ordering scheme for fast 3D UTE MRI. The reordered 2D golden angle (r2DGA) scheme reduces spoiler gradients, enhancing scan efficiency in lung MRI.

Keywords:
Lung MRINon-Cartesian MRIUTE

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Area of Science:

  • Magnetic Resonance Imaging
  • Biomedical Engineering
  • Radiology

Background:

  • 3D UTE sequences often require additional spoiler gradients to prevent magnetization refocusing.
  • Reducing spoiler gradients can shorten TR and improve encoding efficiency in UTE MRI.

Purpose of the Study:

  • To develop and validate a novel ordering scheme for fast 3D UTE acquisition.
  • To reduce or eliminate spoiler gradients by utilizing encoding gradient-induced spoiling effects.
  • To increase encoding efficiency in 3D UTE sequences.

Main Methods:

  • Derived UTE signal evolution and gradient spoiling effects from Bloch equations.
  • Developed and simulated a reordered 2D golden angle (r2DGA) ordering scheme.
  • Validated the r2DGA scheme in phantom and volunteer studies, comparing it to sequential and 3D golden angle schemes.

Main Results:

  • The r2DGA scheme demonstrated increased scan efficiency in both single breath-holding (60% increase) and free breathing (20% reduction) 3D lung MRI.
  • Spoiler gradients were reduced or removed, leading to improved encoding efficiency.
  • The scheme showed practical improvements in lung MRI applications.

Conclusions:

  • The proposed r2DGA ordering scheme for UTE acquisition effectively reduces spoiler gradients.
  • This leads to increased encoding efficiency and improved performance in both breath-holding and free breathing lung MRI.
  • The r2DGA scheme offers a promising approach for faster 3D UTE imaging.