公开(公告)号：US20150316630A1

公开(公告)日：2015-11-05

申请号：US14677877

申请日：2015-04-02

Applicant: University of Virginia Patent Foundation

Inventor： Li Zhao ,  Craig H. Meyer

IPC: G01R33/48

CPC classification number: G01R33/5611 ,  G01R33/4818 ,  G01R33/4824

Abstract: Some aspects of the present disclosure relate image reconstruction using a variable-density spiral trajectory. An exemplary method for image reconstruction includes acquiring MR data, which includes determining a multi-level undersampling pattern based on sampling distance and probability functions, and determining a desired variable-density spiral trajectory based on the undersampling pattern. Acquiring the MR data also includes generating spiral gradient waveforms based on the desired trajectory, and tracing a variable-density spiral trajectory using the spiral gradient waveforms. After tracing, the MR data can be sub-sampled based on the variable-density spiral trajectory. The method also includes reconstructing one or more images based on the acquired MR data.

Abstract translation: 本公开的一些方面涉及使用可变密度螺旋轨迹的图像重建。 用于图像重建的示例性方法包括获取MR数据，其包括基于采样距离和概率函数来确定多级欠采样模式，以及基于所述欠采样模式来确定期望的可变密度螺旋轨迹。 获取MR数据还包括基于期望的轨迹生成螺旋梯度波形，以及使用螺旋梯度波形跟踪可变密度螺旋轨迹。 跟踪后，MR数据可以基于可变密度螺旋轨迹进行子采样。 该方法还包括基于获取的MR数据重建一个或多个图像。