Comparison of a 32-Channel with a 12-Channel Head Coil: Are There Relevant Improvements for Functional Imaging?
Comparison of a 32-Channel with a 12-Channel Head Coil: Are There Relevant Improvements for Functional Imaging?
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DOI：
10.1002/jmri.22614
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发表时间：
2011-07-01
影响因子：
4.4
通讯作者：
Lotze, Martin
中科院分区：
文献类型：
--
作者：
Kaza, Evangelia;Klose, Uwe;Lotze, Martin
目的：为了评估一个12或32通道的头部线圈和预扫描归一化滤波器的功能磁共振成像（fMRI）的研究在不同的大脑regions.Materials和方法：fMRI是从36名志愿者执行一个视觉指示的运动范式使用12通道的头部矩阵线圈和32通道相控阵列头部线圈与和不预扫描归一化滤波在3 T。对侧初级运动和视觉皮层，对侧丘脑和同侧小脑前半球的实验条件下的时间过程中的信噪比（tSNR）和功能激活的幅度（β值，t值，信号变化百分比）进行了统计学比较。在没有过滤的情况下，32通道阵列为视觉皮层提供了更高的功能激活幅度，而12通道阵列在丘脑和小脑中在这方面似乎上级。过滤没有显着影响的fMRI激活幅度检测从12通道线圈;其应用程序有利于32通道线圈在皮层下和小脑的位置，但disfavored它在cortical ons.Conclusion：32通道线圈检测到更多的fMRI激活皮质，但低于皮层下比12通道线圈;预扫描正常化改善激活参数仅在中枢脑结构。
Purpose: To evaluate the suitability of a 12- or 32-channel head coil and of a prescan normalization filter for functional magnetic resonance imaging (fMRI) studies at different brain regions.Materials and Methods: fMRI was obtained from 36 volunteers executing a visually instructed motor paradigm using a 12-channel head matrix coil and a 32-channel phased-array head coil with and without prescan normalization filtering at 3 T. The time-course signal-to-noise ratio (tSNR) and the magnitude of functional activation (beta-value, t-value, percent signal change) were statistically compared between experimental conditions for the contralateral primary motor and visual cortex, contralateral thalamus, and ipsilateral anterior cerebellar hemispheres.Results: tSNR was higher overall measuring with the 32-channel array and with prescan normalization. Without filtering, the 32-channel array delivered higher functional activation magnitudes for the visual cortex, whereas the 12-channel array seemed superior in this respect in thalamus and cerebellum. Filtering did not considerably affect the fMRI-activation magnitude detected from the 12-channel coil; its application favored the 32-channel coil at the subcortical and cerebellar locations but disfavored it at the cortical ones.Conclusion: The 32-channel coil detected more fMRI-activation cortically but less subcortically than the 12-channel coil; prescan normalization improved activation parameters only at central brain structures.