PURPOSE To explore the motion sensitivity of magnetic resonance fingerprinting (MRF), we performed experiments with different types of motion at various time intervals during multiple scans. Additionally, we investigated the possibility to correct the motion artifacts based on redundancy in MRF data. METHODS A radial version of the FISP-MRF sequence was used to acquire one transverse slice through the brain. Three subjects were instructed to move in different patterns (in-plane rotation, through-plane wiggle, complex movements, adjust head position, and pretend itch) during different time intervals. The potential to correct motion artifacts in MRF by removing motion-corrupted data points from the fingerprints and dictionary was evaluated. RESULTS Morphological structures were well preserved in multi-parametric maps despite subject motion. Although the bulk T1 values were not significantly affected by motion, fine structures were blurred when in-plane motion was present during the first part of the scan. On the other hand, T2 values showed a considerable deviation from the motion-free results, especially when through-plane motion was present in the middle of the scan (-44% on average). Explicitly removing the motion-corrupted data from the scan partially restored the T2 values (-10% on average). CONCLUSION Our experimental results showed that different kinds of motion have distinct effects on the precision and effective resolution of the parametric maps measured with MRF. Although MRF-based acquisitions can be relatively robust to motion effects occurring at the beginning or end of the sequence, relying on redundancy in the data alone is not sufficient to assure the accuracy of the multi-parametric maps in all cases.

中文翻译：

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探索磁共振指纹对运动的敏感性。

目的为了探索磁共振指纹图谱（MRF）的运动敏感性，我们在多次扫描期间的不同时间间隔进行了不同类型运动的实验。此外，我们研究了基于MRF数据冗余来校正运动伪影的可能性。方法使用放射状的FISP-MRF序列获取穿过大脑的一个横向切片。指示三名受试者在不同的时间间隔内以不同的方式运动（面内旋转，面内摆动，复杂运动，调整头部位置和假发痒）。评估了通过从指纹和词典中删除运动损坏的数据点来纠正MRF中的运动伪影的可能性。结果尽管对象运动，形态学结构仍能在多参数图中得到很好的保留。尽管总体T1值不受运动的影响很大，但是当在扫描的第一部分出现平面内运动时，精细的结构会模糊。另一方面，T2值显示出与无运动结果有相当大的偏差，尤其是在扫描过程中出现贯穿平面运动时（平均为-44％）。从扫描中明确删除运动损坏的数据可以部分恢复T2值（平均-10％）。结论我们的实验结果表明，不同类型的运动对使用MRF测量的参数图的精度和有效分辨率有明显的影响。尽管基于MRF的采集对于序列开始或结束时出现的运动效果可能相对较健壮，