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相关概念视频

Assessment of Diffusion and Perfusion01:17

Assessment of Diffusion and Perfusion

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Understanding and evaluating diffusion and perfusion is critical in assessing a patient's respiratory and circulatory health. These processes play key roles in maintaining the body's internal environment, ensuring that tissues receive adequate oxygen while waste products are efficiently removed.
The Role of Diffusion in Respiration
Diffusion is the process by which molecules move from an area of higher concentration to an area of lower concentration. In the respiratory system, this...
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Diffusion is the passive movement of substances down their concentration gradients—requiring no expenditure of cellular energy. Substances, such as molecules or ions, diffuse from an area of high concentration to an area of low concentration in the cytosol or across membranes. Eventually, the concentration will even out, with the substance moving randomly but causing no net change in concentration. Such a state is called dynamic equilibrium, which is essential for maintaining overall...
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The non-destructive nature and ability to provide valuable chemical information make IR spectroscopy a versatile technique with broad applications in various scientific and industrial fields. IR spectroscopy is commonly used to identify and characterize organic and inorganic compounds. It provides information about the functional groups present in a molecule and the bonding between atoms. This helps in the structural elucidation of compounds during organic synthesis, pharmaceutical research,...
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IR Spectrum01:19

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When infrared (IR) radiation passes through a molecule, the bonds stretch or bend by absorbing the radiation. This absorption creates the molecule's absorption spectrum, which is the plot of its percentage transmittance versus wavenumber.
Transmittance is defined as the ratio of the radiant power passing through a sample to that from the radiation's source. Multiplying the transmittance by 100 gives the percent transmittance (%T), which varies between 100% (no absorption) and 0%...
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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
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扩散频谱成像研究的研究进展

Fenfen Sun1, Yingwen Huang1, Jingru Wang1

  • 1Center for Brain, Mind and Education, Shaoxing University, Shaoxing 312000, China.

Brain sciences
|October 28, 2023
PubMed
概括
此摘要是机器生成的。

扩散光谱成像 (DSI) 通过捕捉复杂的纤维方向,提供了超越传统DTI的高级大脑微观结构分析. 本综述探讨了DSI通道图,提出了减少扫描时间和增强临床应用的解决方案.

关键词:
申请申请表 申请表 申请表扩散磁共振成像技术的使用.扩散光谱成像成像技术方法论 方法论 方法论在进步方面取得了进展.

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科学领域:

  • 神经成像是一种神经成像.
  • 生物物理学的生物物理.
  • 医学物理 医学物理

背景情况:

  • 传统的扩散张力成像 (DTI) 由于其高斯扩散假设,在解决大脑中复杂的多向纤维通道方面存在局限性.
  • 扩散光谱成像 (DSI) 通过采样整个q空间来克服这些局限性,使得水分子扩散配置文件的高角度分辨率估计成为可能.

研究的目的:

  • 提供扩散光谱成像 (DSI) 曲谱学的全面审查,涵盖其原则,方法和应用.
  • 确定和提出解决DSI当前挑战的解决方案,旨在促进其更广泛的临床采用.

主要方法:

  • 对DSI原则,数据采集 (q空间采样) 和曲谱算法现有文献的审查.
  • 与DTI相比,DSI重建复杂的神经通路的能力的分析.
  • 识别挑战,包括漫长的扫描时间和复杂的后处理.

主要成果:

  • DSI准确地可视化了多向纤维,并改善了通道的重建,揭示了DTI错过的大脑结构.
  • DSI有可能识别出新的神经成像生物标志物,用于疾病诊断和进展预测.
  • 目前的局限性包括长时间的获取时间和复杂的数据分析,阻碍了广泛的临床使用.

结论:

  • 压缩传感技术显示出减少DSI扫描时间的希望.
  • 在DSI研究中扩大概率密度函数的应用,可以获得更丰富的信息.
  • 大规模的研究对于验证DSI发现的临床可靠性和可重复性至关重要.