Comparison between conventional and golden ratio based radial trajectories: an eddy currents study

	Comparison between conventional and golden ratio based radial trajectories: an eddy currents study
	Jie Yang; Yanchun Zhu; Shuo Li; Nan Fu; Shaode Yu; Rongmao Li; Yaoqin Xie
刊名	BMC Medical Imaging
	2016
英文摘要	Aims：Golden ratio based k-space trajectories are widely used in dynamic MRI since it provides approximate uniform k-space distribution. However, rapidly switching gradient induces eddy currents, generating artifacts in image. The golden ratio (GR) based radial strategy was compared with conventional radial strategy on 0.7T open superconducting MRI system.Materials and methods：In conventional radial strategy, a constant angle increment Φuniform = 180°/P between neighboring profiles. In GR based radial strategy, the azimuthal spacing is ΦGR = 180°/1.618 = 111.2°. First, a simulation was carried out to the comparison between ideal and net gradient of Shepp-Logan phantom with two radial strategies respectively. Second, a pure water phantom was sampled by Cartesian, conventional and GR based radial trajectory on the 0.7T open superconducting MRI system. Three orthogonal planes were acquired. SNR was compared between these three sampling trajectories, and images from Cartesian trajectory were used as reference.Results：Result of simulation has illustrated that the impact of eddy currents on the ideal gradient with GR based radial strategy is more apparent. The result of a pure phantom shows that SNR values of both radial strategies (conventional: 40.76 GR:16.11) are far smaller than Cartesian strategy (145.15).Conclusions：Eddy currents artifacts are more serious in GR based radial trajectory. Rapid switching gradient in GR based radial strategy induces more eddy currents than conventional radial strategy, which may limit the application of GR based trajectories especially in high magnet filed system.
收录类别	其他
原文出处	https://bmcmedimaging.biomedcentral.com/articles/10.1186/s12880-016-0164-6
语种	英语
内容类型	期刊论文
源URL	[http://ir.siat.ac.cn:8080/handle/172644/10423]
专题	深圳先进技术研究院_医工所
作者单位	BMC Medical Imaging
推荐引用方式 GB/T 7714	Jie Yang,Yanchun Zhu,Shuo Li,et al. Comparison between conventional and golden ratio based radial trajectories: an eddy currents study[J]. BMC Medical Imaging,2016.
APA	Jie Yang.,Yanchun Zhu.,Shuo Li.,Nan Fu.,Shaode Yu.,...&Yaoqin Xie.(2016).Comparison between conventional and golden ratio based radial trajectories: an eddy currents study.BMC Medical Imaging.
MLA	Jie Yang,et al."Comparison between conventional and golden ratio based radial trajectories: an eddy currents study".BMC Medical Imaging (2016).