University Hospital Freiburg, Department of Diagnostic Radiology, Medical Physics, Freiburg, Germany.
Magn Reson Med. 2010 Mar;63(3):701-12. doi: 10.1002/mrm.22162.
Breathing motion is one of the main sources of artifacts in MRI acquisitions that can severely impair diagnosis. In MRI with continuously moving table, the application of common motion compensation approaches such as breath holding or the synchronization of the measurement with the breathing motion can be problematic. In this study, a technique for the reduction of breathing-motion artifacts for MRI with continuously moving table is presented, which reconstructs motion-consistent volumes from data acquired during free breathing. Axial images are acquired rapidly compared to the period of the breathing motion and consistently combined using a combination of rigid and nonrigid slice-to-volume registration. This new technique is compared to a previously reported artifact reduction method for MRI with continuously moving table that is based on the same acquisition scheme. While the latter method only suppresses ghosting artifacts, the new technique is shown to additionally reduce blurring, misregistrations, and signal cancellations in the reconstructed images.
呼吸运动是磁共振成像采集的主要伪影来源之一，可严重影响诊断。在连续移动台的磁共振成像中，应用常见的运动补偿方法，如屏气或测量与呼吸运动同步，可能会有问题。在这项研究中，提出了一种用于连续移动台磁共振成像中减少呼吸运动伪影的技术，该技术从自由呼吸期间采集的数据中重建运动一致的体积。与呼吸运动的周期相比，轴向图像可以快速采集，并使用刚性和非刚性的切片到体积配准的组合一致地组合。将这项新技术与以前报道的基于相同采集方案的连续移动台磁共振成像伪影减少方法进行了比较。虽然后一种方法仅抑制鬼影伪影，但新方法显示在重建图像中还可以减少模糊、配准错误和信号消除。
