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Related Experiment Videos

MRI using a concentric rings trajectory.

Hochong H Wu1, Jin Hyung Lee, Dwight G Nishimura

  • 1Magnetic Resonance Systems Research Laboratory, Department of Electrical Engineering, Stanford University, Stanford, California, USA. hochong@stanford.edu

Magnetic Resonance in Medicine
|October 31, 2007
PubMed
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The concentric rings k-space trajectory offers faster MRI scans and better image quality, especially for magnetization-prepared studies. This method corrects off-resonance blurring for high-resolution imaging.

Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Medical Imaging Physics

Background:

  • Non-Cartesian MRI trajectories can suffer from off-resonance effects, leading to image blurring and reduced quality.
  • Magnetization-prepared sequences are sensitive to trajectory properties and scan time.

Purpose of the Study:

  • To evaluate the concentric rings 2D k-space trajectory as an efficient readout for MRI.
  • To assess the trajectory's performance in terms of scan time, image quality, and correction of artifacts.

Main Methods:

  • Utilized a concentric rings 2D k-space sampling strategy.
  • Developed and applied off-resonance blur correction using multifrequency reconstruction based on field maps acquired without extra excitations.
  • Conducted simulations and experimental validations.

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Main Results:

  • Concentric rings trajectory is inherently centric-ordered, providing smooth k-space weighting and enabling shorter scan times.
  • Off-resonance blur can be effectively corrected, yielding high-resolution images.
  • The trajectory demonstrates minimal T(2)(*) modulation effects and superior flow/motion property distribution compared to Cartesian sampling.

Conclusions:

  • The concentric rings trajectory is a promising alternative for MRI, particularly for magnetization-prepared studies, due to its efficiency and robustness.
  • The proposed correction method successfully mitigates off-resonance artifacts, enhancing image quality.
  • This trajectory offers advantages in scan time and artifact handling over conventional methods.