Wu Wenchuan, Fang Sheng, Guo Hua
Sheng Wu Yi Xue Gong Cheng Xue Za Zhi. 2014 Jun;31(3):657-61, 670.
Aiming at motion artifacts and off-resonance artifacts in multi-shot diffusion magnetic resonance imaging (MRI), we proposed a joint correction method in this paper to correct the two kinds of artifacts simultaneously without additional acquisition of navigation data and field map. We utilized the proposed method using multi-shot variable density spiral sequence to acquire MRI data and used auto-focusing technique for image deblurring. We also used direct method or iterative method to correct motion induced phase errors in the process of deblurring. In vivo MRI experiments demonstrated that the proposed method could effectively suppress motion artifacts and off-resonance artifacts and achieve images with fine structures. In addition, the scan time was not increased in applying the proposed method.
针对多次激发扩散磁共振成像（MRI）中的运动伪影和失谐伪影，本文提出了一种联合校正方法，无需额外采集导航数据和场图即可同时校正这两种伪影。我们利用所提出的方法，采用多次激发可变密度螺旋序列采集MRI数据，并使用自动聚焦技术进行图像去模糊处理。在去模糊过程中，我们还使用直接法或迭代法校正运动引起的相位误差。体内MRI实验表明，该方法能有效抑制运动伪影和失谐伪影，获得具有精细结构的图像。此外，应用该方法不会增加扫描时间。
