Regularly incremented phase encoding - MR fingerprinting (RIPE-MRF) for enhanced motion artifact suppression in preclinical cartesian MR fingerprinting.
Regularly incremented phase encoding - MR fingerprinting (RIPE-MRF) for enhanced motion artifact suppression in preclinical cartesian MR fingerprinting.
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DOI：
10.1002/mrm.26865
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发表时间：
2018-04
影响因子：
3.3
通讯作者：
Flask CA
中科院分区：
文献类型：
--
作者：
Anderson CE;Wang CY;Gu Y;Darrah R;Griswold MA;Yu X;Flask CA
引入定期增量相位编码-磁共振指纹（RIPE-MRF）方法，以限制临床前MRF评估对脉动和呼吸运动伪影的灵敏度。与以前报道的标准笛卡尔MRF方法（SC-MRF）相比，所提出的RIPE-MRF方法使用修改后的笛卡尔轨迹，该轨迹改变每个动态MRF数据集内的采集相位编码线。使用RIPE-MRF和SC-MRF方法，在7 T临床前MRI扫描仪上无门控或触发地扫描小鼠和小鼠。比较了两种方法（n=5）的体外体模T1和T2测量值以及伪影噪声比（ANR）和基于MRF的T1和T2平均值和标准差的体内肝脏评估。RIPE-MRF显示搏动区（P<0.005）和呼吸运动区（P<0.0005）的ANR显著降低。与SC-MRF方法相比，RIPE-MRF方法在T1和T2测量方面也表现出更高的精度（P< 0.05）。RIPE-MRF和SC-MRF方法显示了相似的平均T1和T2估计值（平均值差异<10%）。这些结果表明，RIPE-MRF方法可以提供有效的运动伪影抑制，对体内小动物MRI研究的T1和T2准确性的影响最小。
The Regularly Incremented Phase Encoding – Magnetic Resonance Fingerprinting (RIPE-MRF) method is introduced to limit the sensitivity of preclinical MRF assessments to pulsatile and respiratory motion artifacts. As compared to previously reported standard Cartesian MRF methods (SC-MRF), the proposed RIPE-MRF method uses a modified Cartesian trajectory that varies the acquired phase encoding line within each dynamic MRF dataset. Phantoms and mice were scanned without gating or triggering on a 7T preclinical MRI scanner using the RIPE-MRF and SC-MRF methods. In vitro phantom T1 and T2 measurements as well as in vivo liver assessments of artifact-to-noise ratio (ANR) and MRF-based T1 and T2 mean and standard deviation were compared between the two methods (n=5). RIPE-MRF showed significant ANR reductions in regions of pulsatility (P<0.005) and respiratory motion (P<0.0005). RIPE-MRF also exhibited improved precision in T1 and T2 measurements in comparison to the SC-MRF method (P< 0.05). The RIPE-MRF and SC-MRF methods displayed similar mean T1 and T2 estimates (difference in mean values <10%). These results show that the RIPE-MRF method can provide effective motion artifact suppression with minimal impact on T1 and T2 accuracy for in vivo small animal MRI studies.
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