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The Scientific Method02:40

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Research is what makes the difference between facts and opinions. Facts are observable realities, and opinions are personal judgments, conclusions, or attitudes that may or may not be accurate. In the scientific community, facts can be established only using evidence collected through empirical research.
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相关实验视频

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Advanced Diffusion Imaging in The Hippocampus of Rats with Mild Traumatic Brain Injury
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基于MRI的脑行为模型对扩散的可重复性进行了加权.

Raviteja Kotikalapudi1,2,3, Balint Kincses4,5, Giuseppe Gallitto4,5

  • 1Department of Neurology, University Medicine Essen, Essen, Germany. raviteja.kotikalapudi@uk-essen.de.

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概括

使用扩散MRI连接体的全脑关联研究 (BWAS) 显示了中度的可复制性. 类似特征的表型比类似状态的表型更容易复制,流线连接体提供最佳结果.

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相关实验视频

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科学领域:

  • 神经成像是一种神经成像.
  • 在Connectomics上,我们提供了连接.
  • 生物统计学 生物统计学

背景情况:

  • 使用MRI进行全脑关联研究 (BWAS) 的可复制性是一个越来越令人担忧的问题.
  • 以前的研究集中在功能和解剖MRI上,使得结构连接体被低估了.

研究的目的:

  • 综合评估BWAS的可复制性,使用各种扩散MRI衍生结构连接体指标.
  • 调查影响BWAS可复制性的因素,包括表型类型和效果大小.

主要方法:

  • 利用了来自人类结合体项目 (HCP) 和自闭症脑成像数据交换 (ABIDE) 数据集的扩散MRI数据.
  • 使用流线计数,分数异构 (FA),平均扩散率 (MD),辐射扩散率 (RD) 和轴向扩散率 (AD) 来评估大脑表型关联的可复制性.
  • 将表型分类为类似特征或类似状态的表型,并分析了可复制性,效果大小和样本大小之间的关系.

主要成果:

  • 36%的脑表型关联在数据集中可复制,使用至少一个扩散MRI指标,发现样本大小高达425.
  • 与状态类型 (19%) 相比,特征类型的表型表现出更高的可复制性 (50%).
  • 基于流线的连接体显示出最高的可复制性 (29-42%),可复制性与效果大小直接相关,更大的效果 (>5%的差异) 需要更小的发现样本大小 (<300).

结论:

  • 类似特征的表型表现出良好的可复制性,在BWAS中使用结构连接体的样本大小中适度.
  • 需要非常大的样本大小 (>425) 的BWAS模型可能由于效果大小小而具有有限的实际相关性.
  • 较大的样本大小对于强大的可解释性,公平性评估和神经成像发现的概括性至关重要.