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K-空间用于采集磁共振原始信号,作为磁共振成像(MRI)数据采集以及图像重建时应用的抽象空间,实际上为傅立叶变换中空间频率K所对应的空间。由于所有的MRI参数均受到K-空间的影响,因此要改善MRI成像质量和速度,必须要明确K-空间的含义、性质以及技术原理,从而改善K-空间技术,优化MRI成像技术。常用的K-空间采集技术有:笛卡尔K-空间采集填充、螺旋状采集填充、螺旋桨采集填充、部分K-空间采集技术、匙孔技术、并行成像技术、以及SENSE重建算法和后处理技术。本文就K-空间这些技术的概念、K-空间技术的原理、常规K-空间采集技术的研究进展一作综述,为加速成像,消除混叠伪影、减少运动伪影提高图像质量提供理论依据,为临床取得更好诊断的效果而服务。
K-space is used to acquire original magnetic resonance signals, which is used as the abstract space for magnetic resonance imaging (MRI) data acquisition and image reconstruction. It is actually the space corresponding to the spatial frequency K in the Fourier transform. Because all MRI parameters are affected by K-space, to improve the quality and speed of MRI imaging, the meaning, nature and principle of K-space must be clarified so as to improve K-space technology and optimize MRI imaging technology. Commonly used K-space acquisition techniques include Cartesian K-space acquisition and fill, helical acquisition and filling, propeller acquisition and filling, partial K-space acquisition, keyhole technology, parallel imaging and SENSE reconstruction and postprocessing techniques. In this paper, the concept of K-space technology, the principle of K-space technology and the research progress of conventional K-space acquisition technology are reviewed. This study provides a theoretical basis for accelerating imaging, eliminating aliasing artifacts and reducing motion artifacts to improve image quality. Serve clinically for better diagnostic results and services.