Motion Artifacts Correction in MRI with Navigator Echo Combined with Compressed Sensing

doi:10.11938/cjmr20150303

Abstract

Abstract:

In MRI, rigid-body motion with limited amplitude can be tracked effectively by using navigator echo, and then corrected with the information provided by the navigator echo. However, tracking and correction of large and/or non-rigid motion artifact by means of navigator echo could be problematic. Images with a sparse representation in a given domain can be accurately reconstructed from undersampled datasets by using nonlinear reconstruction algorithms, such as compressed sensing. In this study, we developed an imaging technique using pseudo-random k-space trajectory for acquisition combined with motion tracking by navigator echo. After discarding the motion corrupted lines in k-space, the randomly undersampled dataset was reconstructed using compressed sensing. Experimental results demonstrated that good image quality can be obtained with this technique even in the presence of large non-rigid motions.

Key words: MRI, motion artifacts, navigator echo, compressed sensing

CLC Number:

O482.53

DONG Fang，WANG Qian-feng，ZHENG Hui，LI Zhi-ming，YANG Guang，LI Jian-qi*. Motion Artifacts Correction in MRI with Navigator Echo Combined with Compressed Sensing[J]. Chinese Journal of Magnetic Resonance, 2015, 32(3): 419-429.

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