Spatial normalization of lesioned brains: performance evaluation and impact on fMRI analyses.

Spatial normalization of lesioned brains: performance evaluation and impact on fMRI analyses.
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DOI:
10.1016/j.neuroimage.2007.04.065
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发表时间:
2007-09-01
期刊:
影响因子:
5.7
通讯作者:
Friston K
Friston K
中科院分区:
医学1区
文献类型:
--
作者:
Crinion J;Ashburner J;Leff A;Brett M;Price C;Friston K

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神经成像数据的组分析的关键组成部分是精确和有效的空间归一化(即,对象间图像配准)。当患者具有结构性脑损伤(例如中风)时,该过程可能由于受试者与标准化模板图像之间缺乏对应而混淆。目前处理这个问题的程序包括正则化用于将受损大脑与模板匹配的扭曲参数的估计,或“成本函数掩蔽”;这两种解决方案都有显着的缺点。我们报告了三个实验,确定最好的空间归一化结构受损的大脑,并建立是否正常化之间的差异有显着影响功能激活的推断。我们的新协议评估不同的标准化解决方案的影响,可以很容易地应用于任何神经影像学研究。这对结构性脑损伤患者研究中的结构和功能成像技术的用户具有重要意义。
A key component of group analyses of neuroimaging data is precise and valid spatial normalization (i.e., inter-subject image registration). When patients have structural brain lesions, such as a stroke, this process can be confounded by the lack of correspondence between the subject and standardized template images. Current procedures for dealing with this problem include regularizing the estimate of warping parameters used to match lesioned brains to the template, or “cost function masking”; both these solutions have significant drawbacks. We report three experiments that identify the best spatial normalization for structurally damaged brains and establish whether differences among normalizations have a significant effect on inferences about functional activations. Our novel protocols evaluate the effects of different normalization solutions and can be applied easily to any neuroimaging study. This has important implications for users of both structural and functional imaging techniques in the study of patients with structural brain damage.
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