Cardiac motion in diffusion-weighted MRI of the liver: artifact and a method of correction.
Cardiac motion in diffusion-weighted MRI of the liver: artifact and a method of correction.
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DOI：
10.1002/jmri.22816
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发表时间：
2012-02
影响因子：
4.4
通讯作者：
Bydder, Mark
中科院分区：
文献类型：
--
作者：
Liau, Joy;Lee, Jimmy;Schroeder, Michael E.;Sirlin, Claude B.;Bydder, Mark
表征肝脏中的心脏运动伪影，并评估在重复测量中使用后处理方法来减轻这些伪影的效果。三名受试者接受屏气扩散加权（DW）扫描，包括25次重复，3个b值（0,500,1000秒/mm2）。从这些重复计算的统计图被用来评估肝脏中心脏运动伪影的分布和行为。一个客观的后处理方法，以减少伪影与放射科医生定义的金标准进行比较。信号消失在心脏近端明显，如左叶，但也存在于右叶和远端肝段。随着b值的增加，差值恶化，导致对扩散系数的高估。通过参考放射科医师定义的金标准，显示了后处理校正方法，以减少心脏运动伪影。心脏运动导致肝脏DW成像出现明显伪影；我们提出了一种后处理方法，可用于减轻伪影，并有利于在多次重复的采集中进行标准信号平均。
To characterize cardiac motion artifacts in the liver and assess the use of a post-processing method to mitigate these artifacts in repeat measurements. Three subjects underwent breathhold diffusion-weighted (DW) scans consisting of 25 repetitions for three b-values (0, 500, 1000 sec/mm2). Statistical maps computed from these repetitions were used to assess the distribution and behavior of cardiac motion artifacts in the liver. An objective post-processing method to reduce the artifacts were compared with radiologist-defined gold standards. Signal dropout is pronounced in areas proximal to the heart, such as the left lobe, but also present in the right lobe and in distal liver segments. The dropout worsens with b-value and leads to overestimation of the diffusivity. By reference to a radiologist-defined gold standard, a post-processing correction method is shown to reduce cardiac motion artifact. Cardiac motion leads to significant artifacts in liver DW imaging; we propose a post-processing method that may be used to mitigate the artifact and is advantageous to standard signal averaging in acquisitions with multiple repetitions.
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影响因子：
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作者：
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通讯作者：
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DOI：
10.1007/s10334-009-0183-1
发表时间：
2009-10-01
影响因子：
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作者：
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通讯作者：
Luijten, Peter R.