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- Title
MRI using a concentric rings trajectory.
- Authors
Wu, Hochong H.; Lee, Jin Hyung; Nishimura, Dwight G.
- Abstract
The concentric rings two-dimensional (2D) k-space trajectory provides an alternative way to sample polar data. By collecting 2D k-space data in a series of rings, many unique properties are observed. The concentric rings are inherently centric-ordered, provide a smooth weighting in k-space, and enable shorter total scan times. Due to these properties, the concentric rings are well-suited as a readout trajectory for magnetization-prepared studies. When non-Cartesian trajectories are used for MRI, off-resonance effects can cause blurring and degrade the image quality. For the concentric rings, off-resonance blur can be corrected by retracing rings near the center of k-space to obtain a field map with no extra excitations, and then employing multifrequency reconstruction. Simulations show that the concentric rings exhibit minimal effects due to T
- Publication
Magnetic Resonance in Medicine, 2008, Vol 59, Issue 1, p102
- ISSN
0740-3194
- Publication type
Article
- DOI
10.1002/mrm.21300