Anisotropic field-of-view support for golden angle radial imaging.
Anisotropic field-of-view support for golden angle radial imaging.
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DOI：
10.1002/mrm.25898
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发表时间：
2016-07
影响因子：
3.3
通讯作者：
Nayak KS
中科院分区：
文献类型：
--
作者：
Wu Z;Han F;Hu P;Nayak KS
为黄金角径向成像提供各向异性视野（FOV）支持。在径向成像中，均匀的轮辐密度导致圆形FOV，这对于具有各向异性尺寸的对象是过度的。Larson等人先前表明，角k空间轮辐密度可以由所需的各向异性FOV确定。我们表明，传统的黄金角采样可以部署在一个角度归一化的空间，并转换回k空间，使所需的非均匀辐条密度被保留为任意时间窗口长度。椭圆FOV用于说明这种广义映射方法。进行点扩散函数和轮辐密度分析。采集体模和体内心脏图像。仿真、体模和体内实验证实，所提出的方法能够实现各向异性FOV，同时仍然保持黄金角采样的优点。当与具有相同欠采样因子的各向同性FOV相比时，这种方法对于具有1：0.3的长短轴比的椭圆FOV需要少50%的辐条。我们展示了一个简单的方法，适用于黄金角视图排序各向异性FOV径向成像。这可以减少具有各向异性尺寸的对象的成像时间，同时仍然允许任意时间窗口选择。
To provide anisotropic field-of-view (FOV) support for golden angle radial imaging. In radial imaging, uniform spoke density leads to a circular FOV, which is excessive for objects with anisotropic dimensions. Larson et al. previously showed that the angular k-space spoke density can be determined by the desired anisotropic FOV. We show that conventional golden angle sampling can be deployed in an angle-normalized space and transformed back to k-space such that the desired non-uniform spoke density is preserved for arbitrary temporal window length. Elliptical FOVs were used to illustrate this generalized mapping approach. Point-spread-function and spoke density analysis was performed. Phantom and in vivo cardiac images were acquired. Simulations, phantom, and in vivo experiments confirmed that the proposed method is able to achieve anisotropic FOV while still maintaining the benefits of golden angle sampling. This approach requires 50% less spokes for elliptical FOV with major-to-minor-axis ratio of 1:0.3, when compared to isotropic FOV with the same undersampling factor. We demonstrate a simple method for applying golden angle view ordering to anisotropic FOV radial imaging. This can reduce imaging time for objects with anisotropic dimensions while still allowing arbitrary temporal window selection.