Jhooti P, Wiesmann F, Taylor A M, Gatehouse P D, Yang G Z, Keegan J, Pennell D J, Firmin D N
Magnetic Resonance Unit, Royal Brompton Hospital, London, UK.
J Magn Reson Imaging. 1998 Jul-Aug;8(4):968-80. doi: 10.1002/jmri.1880080428.
Respiration causes continuous change in cardiac position, which leads to image degradation. Phase-encode reordering methods are often used to reduce these artifacts. An improved method for suppressing motion artifacts by reordering the acquisition of k space has been developed that is less sensitive to change of breathing patterns and bulk movement. We describe the theory behind the new approach and compare its results with those of existing methods by use of a phantom with simulated and actual acquired breathing patterns. The comparison was also made in vivo; cardiac scans were performed in 15 subjects with image planes that are known to be particularly susceptible to respiratory artifact. A significant improvement in image quality was achieved compared with conventional nonreordered and existing reordering methods.
呼吸会导致心脏位置持续变化，进而导致图像质量下降。相位编码重排方法常用于减少这些伪影。已经开发出一种通过对k空间采集进行重排来抑制运动伪影的改进方法，该方法对呼吸模式变化和整体运动不太敏感。我们描述了这种新方法背后的理论，并通过使用具有模拟和实际采集呼吸模式的体模，将其结果与现有方法的结果进行比较。还进行了体内比较；对15名受试者进行了心脏扫描，其图像平面已知特别容易受到呼吸伪影的影响。与传统的非重排方法和现有的重排方法相比，图像质量有了显著提高。
