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相关概念视频

Probability Laws01:49

Probability Laws

Overview
DNA Packaging00:58

DNA Packaging

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Entropy02:39

Entropy

Salt particles that have dissolved in water never spontaneously come back together in solution to reform solid particles. Moreover, a gas that has expanded in a vacuum remains dispersed and never spontaneously reassembles. The unidirectional nature of these phenomena is the result of a thermodynamic state function called entropy (S). Entropy is the measure of the extent to which the energy is dispersed throughout a system, or in other words, it is proportional to the degree of disorder of a...
Probability in Statistics01:14

Probability in Statistics

Probability is the likelihood of an event occurring. The term event is defined as a collection of results of a procedure. An event is a simple event when an outcome cannot be divided into simpler parts.
An example of a simple event is a coin toss. The result of a coin toss is either a head or a tail. Here, head and tail are two simple events. These two simple events make up the sample space. Further, the probability of an event occurring falls within the range of 0 to 1. The probability of an...
Propagation of Uncertainty from Random Error00:59

Propagation of Uncertainty from Random Error

An experiment often consists of more than a single step. In this case, measurements at each step give rise to uncertainty. Because the measurements occur in successive steps, the uncertainty in one step necessarily contributes to that in the subsequent step. As we perform statistical analysis on these types of experiments, we must learn to account for the propagation of uncertainty from one step to the next. The propagation of uncertainty depends on the type of arithmetic operation performed on...
Propagation of Uncertainty from Systematic Error01:10

Propagation of Uncertainty from Systematic Error

The atomic mass of an element varies due to the relative ratio of its isotopes. A sample's relative proportion of oxygen isotopes influences its average atomic mass. For instance, if we were to measure the atomic mass of oxygen from a sample, the mass would be a weighted average of the isotopic masses of oxygen in that sample. Since a single sample is not likely to perfectly reflect the true atomic mass of oxygen for all the molecules of oxygen on Earth, the mass we obtain from this particular...

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相关实验视频

Updated: May 7, 2026

Co-analysis of Brain Structure and Function using fMRI and Diffusion-weighted Imaging
17:06

Co-analysis of Brain Structure and Function using fMRI and Diffusion-weighted Imaging

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确定性与概率学:对白物质束形状的影响

Yuhan Shuai1, Bramsh Qamar Chandio1, Yixue Feng1

  • 1Imaging Genetics Center, Mark and Mary Stevens Neuroimaging and Informatics Institute, Keck School of Medicine, University of Southern California, Marina del Rey, CA, USA.

bioRxiv : the preprint server for biology
|September 2, 2025
PubMed
概括
此摘要是机器生成的。

概率学曲谱显示白质束的形状相似性更高,例如弧形,提高了可复制性. 然而,确定性方法可以更好地检测神经成像研究中的微妙病理变化.

关键词:
捆绑相邻性确定性跟踪扩散核磁共振可能性追踪卷轴学

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相关实验视频

Last Updated: May 7, 2026

Co-analysis of Brain Structure and Function using fMRI and Diffusion-weighted Imaging
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Co-analysis of Brain Structure and Function using fMRI and Diffusion-weighted Imaging

Published on: November 8, 2012

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科学领域:

  • 神经成像
  • 计算神经科学
  • 医学图像分析

背景情况:

  • 扩散核磁共振扫描使用确定性和概率算法重建白质路径.
  • 这些不同的通道图策略对白质束形态的影响尚不清楚.
  • 左侧弧形囊 (AF_L) 对于语言处理至关重要,连接理解和生产区域.

研究的目的:

  • 为了比较左侧弧形囊 (AF_L) 的确定性与概率学曲谱的形态一致性.
  • 对不同数据集的跨学科形状相似性和可重现性进行评估.
  • 评估捆形状相似性分析在神经成像研究中的质量控制的有用性.

主要方法:

  • 使用捆绑形状相似性分析来比较确定性和概率性路径学结果.
  • 在四个独立数据集 (ADNI,HCP-A,NIMHANS和PING) 中分析了左侧弧形囊.
  • 基于Atlas的验证用于证实形状相似性的发现.

主要成果:

  • 与确定性方法相比,概率曲谱始终显示出AF_L的更高的跨主体形状相似性.
  • 概率方法捕获了更广泛的解剖轨迹,从而提高了数据集的可复制性.
  • 捆绑形状相似性分析证实了与概率追踪更强的结合,表明其对定量质量控制的价值.

结论:

  • 对像AF_L这样的白质束来说,概率学曲谱提供了卓越的形态一致性和可重复性.
  • 概率方法的广泛覆盖可能会降低对微妙,临床相关的病理变异的敏感性.
  • 在研究和临床环境中,选择通道学方法需要平衡形态一致性和检测神经解剖学变异的需要.