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阿尔茨海默氏症成像联盟

Ganna Blazhenets1, Heather M Snyder2, Liana G Apostolova3

  • 1Memory and Aging Center, Weill Institute for Neurosciences, University of California San Francisco, San Francisco, CA, USA.

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概括
此摘要是机器生成的。

百叶状体框架标准化了粉样体-PET成像. 分析显示,19个百分体 (CL) 是一个共同的截止值,但研究的高度异质性表明在应用通用值时要谨慎.

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科学领域:

  • 神经成像是一种神经成像.
  • 生物标志物 生物标志物
  • 阿尔茨海默氏症疾病研究研究

背景情况:

  • 对于协调粉样蛋白-PET量化和促进多队列数据比较,Centiloid框架被广泛采用.
  • 它有助于在研究和临床环境中标准化粉样蛋白成像解释.

研究的目的:

  • 通过在不同队列中比较百分点分布和阳性值,评估百分点框架的全球实施情况.
  • 使用元分析为粉样蛋白-PET阳性建立标准化的切断值.

主要方法:

  • 收集了37个公开可用的队列 (n=41,678) 的数据,包括百叶形值,人口统计和视觉读数.
  • 用高斯混合模型 (GMM) 确定每个队列的百叶状峰和切线 (平均值+2SD的低高斯) .
  • 随机效应的元分析结合了跨队列的数据,子组分析检查了处理管道,无线电追踪器和研究设置的影响. 与视觉读取的对应性使用科恩的卡帕进行了评估.

主要成果:

  • 一个常见的Centiloid峰被确定在1CL,在第二个峰值有显著的异质性 (元分析结果:64CL).
  • 分析得出基于GMM的切线值为19CL (95%CI:16-21CL),无显著差异跨射线追踪剂或研究设置.
  • 基于视觉读取的24CL (95%CI:21-27CL) 的切线显示了与Centiloids的强烈对应 (kappa=0.86),但观察到高的研究间异质性 (I2>80%).

结论:

  • 由元分析得出的Centiloid切断值与现有文献是一致的.
  • 研究中显著的异质性突显了调查促成因素的必要性,并引发了人们对普遍应用共同的截止值的担忧.