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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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Diffusion01:12

Diffusion

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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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相关实验视频

Updated: Jan 15, 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

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一个非线性单通道梯度插件用于前列腺扩散成像.

Nahla M H Elsaid1,2, Horace Z Zhang1, Ates Fettahoglu1,3

  • 1Radiology and Biomedical Imaging, Yale School of Medicine, New Haven, Connecticut, USA.

Magnetic resonance in medicine
|October 13, 2025
PubMed
概括
此摘要是机器生成的。

这项研究表明,非线性"内外"梯度对于人类扩散编码是安全有效的. 这种新型硬件能够在目标器官中准确地绘制明显扩散系数 (ADC).

关键词:
扩散磁共振成像技术的使用.磁共振成像技术的使用非线性梯度线圈的线圈.前列腺ADC映射前列腺ADC映射

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相关实验视频

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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

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科学领域:

  • 磁共振成像 (MRI) 是一种磁共振成像技术.
  • 生物医学工程 生物医学工程

背景情况:

  • 在MRI中扩散编码对于组织特性至关重要.
  • 传统的梯度线圈在产生强烈的局部梯度方面存在局限性.
  • 对于先进的MRI应用,需要新的梯度线圈设计.

研究的目的:

  • 评估用于人类扩散编码的非线性"内外"梯度线圈的技术性能,可行性和安全性.
  • 评估梯度线圈能够为目标器官,如前列腺产生强烈的梯度的能力.
  • 为了确定标准校准方法是否对这种新型梯度系统有效.

主要方法:

  • 描述梯度线圈的空间,时间,机械和声学特性.
  • 获取幽灵和人类实验对象的表面扩散系数 (ADC) 映射数据.
  • 评估加热,噪音,流和周围神经刺激 (PNS).

主要成果:

  • 梯度线圈实现了高梯度强度 (>200 mT/m),适用于前列腺成像.
  • 加热,噪音和流都在人类扫描的可接受范围内.
  • 在幽灵和人类中实现了准确的ADC映射,没有报告的PNS.

结论:

  • 非线性"内外"梯度可以使用常规技术有效校准.
  • 这种硬件提供了一种方便的方法,用于在目标器官中强大的扩散权重.
  • 该系统证明了人类扩散编码应用的可行性和安全性.