Journal
MAGNETIC RESONANCE MATERIALS IN PHYSICS BIOLOGY AND MEDICINE
Volume 34, Issue 1, Pages 109-118Publisher
SPRINGER
DOI: 10.1007/s10334-020-00859-z
Keywords
Eddy currents; Golden-angle; CMR
Funding
- Karolinska Institutet
- Swedish Foundation for Strategic Research [SSF ICA-120063]
- Stockholm County Council [ALF LS 1411-1372]
- Swedish Research Council
- Swedish Heart-Lung Foundation
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The proposed novel double golden-angle profile ordering method successfully reduced the angular step while maintaining image uniformity. Simulations indicated a gradual degradation in image quality with decreasing angular steps and increasing physiological bins. Phantom images demonstrated improved image uniformity and robustness to off-resonance, with in vivo imaging confirming these findings.
Purpose We propose a novel generalization of the three-dimensional double-golden-angle profile ordering, which allows for whole-heart volumetric imaging with retrospective binning and reduced eddy current artifacts. Methods A novel theory bridging the gap between the three-dimensional double golden-angle trajectory, and the two-dimensional tiny-golden-angle trajectory is presented. This enables a class of double golden-angle profile orderings with a smaller angular distance between successivek-space readouts. The novel profile orderings were evaluated through simulations, phantom experiments, and in vivo imaging. Comparisons were made to the original double-golden-angle trajectory. Image uniformity and off-resonance sensitivity were evaluated using phantom measurements, and qualitative image quality was assessed using in vivo images acquired in a healthy volunteer. Results The proposed theory successfully reduced the angular step while maintaining image uniformity after binning. Simulations revealed a slow degradation with decreasing angular steps and an increasing number of physiological bins. The phantom images showed a definite improvement in image uniformity and increased robustness to off-resonance, and in vivo imaging corroborated those findings. Conclusion Reducing the angular step in cardio-respiratory-binned golden-angle imaging shows potential for overcoming eddy current-induced image artifacts associated with 3D golden-angle radial imaging.
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