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Susceptibility, Permittivity and Dielectric Constant01:26

Susceptibility, Permittivity and Dielectric Constant

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When placed in an external electric field, a dielectric material gets polarized. The charge density in the dielectric material is given by the sum of the bound and free charge densities, while the total charge density can also be written in terms of the total electric field. The bound charge density can be measured in terms of polarization, leading to the relationship between electric displacement and polarization.
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Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)01:15

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)

281
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
281

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相关实验视频

Updated: Jun 19, 2025

Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F−
06:53

Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F−

Published on: July 27, 2018

8.7K

使用基于概率密度函数的道组合布洛赫-西格特方法实现了在3T的允许性成像.

Jiajia Wang1, Yunyu Gao1, Sherman Xuegang Xin1

  • 1School of Biomedical Engineering, Southern Medical University, Guangzhou 510515, China.

Bioengineering (Basel, Switzerland)
|July 27, 2024
PubMed
概括

一种新方法提高了磁共振电特性断层扫描 (MR EPT) 测量组织电容性的准确性. 这种技术提高了信号噪声比,可能有助于早期癌症诊断.

科学领域:

  • 医疗成像医学成像
  • 生物物理学的生物物理.
  • 电气工程 电气工程

背景情况:

  • 磁共振电特性断层扫描 (MR EPT) 使用B1+大小测量组织的导电性.
  • 当前MR EPT的准确性受到B1+级的低信号噪声比 (SNR) 的限制.

研究的目的:

  • 引入和评估基于概率密度函数 (PDF) 的道组合布洛赫-西格特 (BSS) 方法,以提高MR EPT的准确性.
  • 评估这种新方法在生物组织的MR EPT中的可行性.

主要方法:

  • 使用3TMRI扫描仪与八通道接收线圈.
  • 采用基于PDF的频道组合BSS方法进行B1+大小评估.
  • 应用了基于赫尔姆霍尔茨的EPT重建算法,并将结果与开放式同轴探头测量结果进行了比较.

主要成果:

  • 基于PDF的通道组合BSS方法证明了允许度测量准确度的提高.
  • Gd幻影的相对电容性重建为52.413 (地面真相78.86),有33.53%的误差.
  • 鼠腿肌的相对电流性重建为54.053 (地面真相为49.04),误差为10.22%.

结论:

关键词:
B1 地图技术的绘制技术布洛赫西格特的方法电气性质断层扫描 电气性质断层扫描相对的允许性相对的允许性.

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Last Updated: Jun 19, 2025

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  • 基于PDF的通道组合BSS方法显著提高了MR EPT电容度测量的准确性.
  • 这种改进的准确性有助于推进MR EPT应用,包括早期癌症检测.