Nayak K S, Tsai C M, Meyer C H, Nishimura D G
Department of Electrical Engineering, Stanford University, Stanford, California 94305-9510, USA.
Magn Reson Med. 2001 Mar;45(3):521-4. doi: 10.1002/1522-2594(200103)45:3<521::aid-mrm1069>3.0.co;2-6.
A new spiral imaging technique incorporates the acquisition of a field map into imaging interleaves. Variable density spiral trajectories are designed to oversample the central region of k-space, and interleaves are acquired at two different echo times. A field map is extracted from this data and multifrequency reconstruction is used to form an off-resonance corrected image using the entire dataset. Simulation, phantom, and in vivo results indicate that this technique can be used to achieve higher image and/or field map spatial resolution compared to conventional techniques. Magn Reson Med 45:521-524, 2001.
一种新的螺旋成像技术将场图采集纳入成像间隔中。可变密度螺旋轨迹被设计用于对k空间的中心区域进行过采样，并且在两个不同的回波时间采集间隔。从该数据中提取场图，并使用多频重建来利用整个数据集形成失谐校正图像。模拟、体模和体内结果表明，与传统技术相比，该技术可用于实现更高的图像和/或场图空间分辨率。《磁共振医学》45:521 - 524，2001年。
