Magn Reson Med:组织的T1信号在动脉自旋标记测量脑血流量时的影响

2016-05-09 MedSci MedSci原创

研究目的:动脉自旋标记可以提供定量的脑血流量的地形图。因为标记的水和结合水相交换,这项研究评估了组织T1信号在使用动脉自旋标记定量测量脑血流量时的影响。研究方法:为了对T1信号进行修饰,低剂量的锰在19只老鼠的一侧半球中脑内注射(在皮质或者纹状体),组织T1信号和脑血流量通过在4.7T磁共振上使用翻转复原及联系的动脉自旋标记序列获得地形图。研究结果:当通过动态磁敏感和弥散加权成像评估时,发现锰减少

研究目的:动脉自旋标记可以提供定量的脑血流量的地形图。因为标记的水和结合水相交换,这项研究评估了组织T1信号在使用动脉自旋标记定量测量脑血流量时的影响。

研究方法:为了对T1信号进行修饰,低剂量的锰在19只老鼠的一侧半球中脑内注射(在皮质或者纹状体),组织T1信号和脑血流量通过在4.7T磁共振上使用翻转复原及联系的动脉自旋标记序列获得地形图。

研究结果:当通过动态磁敏感和弥散加权成像评估时,发现锰减少了组织的T1信号超过30%,但是对别的组织特性很少有影响。使用单室模型,发现单一的组织T1值在锰注射侧比非注射侧皮层减少34%,纹状体减少22%。使用T1地形图,其数值各自变为-7% 和 +8%。                                    

研究结论:低剂量的锰减少组织T1值而不改变脑血流量。不同的T1对动脉自旋标记评估脑血流量在独立区域有影响。在动物上,当T1改变超过组织T1被定义的精度是,当使用动脉自旋标记测量脑血流量是应该获得组织T1的评估。

原始出处:

Debacker CS1,2,3, Daoust A1,2, Köhler S3, Voiron J3, Warnking JM1,2, Barbier EL1,2.et al,Impact of tissue T1 on perfusion measurement with arterial spin labeling.,Magn Reson Med. 2016 May 2. doi: 10.1002/mrm.26255. [Epub ahead of print]


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    2016-05-11 hongbochen
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    2016-05-10 1dd8a7c5m95(暂无匿称)

    学习了,希望有新的突破!

    0

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