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 successive k-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.

中文翻译：

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推广三维黄金角径向采集以减少 bSSFP CMR 成像中的涡流伪影。

目的

我们提出了一种对三维双金角轮廓排序的新颖概括，它允许具有回顾性分箱和减少涡流伪影的全心脏体积成像。

方法

提出了一种弥合三维双黄金角轨迹与二维小金角轨迹之间差距的新理论。这实现了一类双黄金角轮廓排序，在连续k空间读数之间具有较小的角距离。通过模拟、幻像实验和体内成像评估了新的配置文件排序。与原来的双金角轨迹进行了对比。使用体模测量评估图像均匀性和偏共振灵敏度，并使用在健康志愿者中获得的体内图像评估定性图像质量。

结果

所提出的理论成功地减少了角度步长，同时在合并后保持图像均匀性。模拟显示，随着角度步长的减少和生理箱数量的增加，退化缓慢。体模图像显示出图像均匀性的明显改善和对偏共振的增强鲁棒性，体内成像证实了这些发现。

结论

减少心肺合并黄金角成像中的角度步长显示了克服与 3D 黄金角径向成像相关的涡流引起的图像伪影的潜力。