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相关概念视频

Bode Plots Construction01:24

Bode Plots Construction

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The Bode plot is an essential tool in control system analysis, mapping the frequency response of a system through a magnitude plot and a phase plot, both against a logarithmic frequency axis. To construct a Bode plot, consider the transfer function H(ω):
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NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

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When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
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Monitoring Lung Function with Electrical Impedance Tomography in the Intensive Care Unit
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基于噪声的校正用于电阻断层扫描.

Kai Mason1, Florencia Maurino-Alperovich1, David Holder1

  • 1Department of Medical Physics and Biomedical Engineering, University College London, London, United Kingdom.

Physiological measurement
|May 21, 2024
PubMed
概括

一种新的基于噪声的校正 (NBC) 方法通过减少噪声传播,显著提高了电阻断层扫描 (EIT) 的图像质量. 不相关的基于噪声的校正建议在EIT应用程序中一般使用.

科学领域:

  • 生物医学工程 生物医学工程
  • 医疗成像医学成像
  • 电气工程 电气工程

背景情况:

  • 阻抗成像中的噪声测量导致图像不准确.
  • 现有的后处理技术无法有效计算和抑制测量噪声传播.

研究的目的:

  • 开发一种基于噪声的校正 (NBC) 后处理方法,用于阻抗断层扫描.
  • 评估NBC在提高电阻断层扫描 (EIT) 图像质量的有效性.
  • 对比NBC的相关噪声与非相关噪声的性能.
  • 评估NBC对体内数据的适用性及其在不同几何形状的稳定性.

主要方法:

  • 在2D和3D领域 (同质和异质人头) 进行in silico EIT.
  • 使用实验EIT在盐水中的验证方法 (2D圆形和3D人头形).
  • 使用权重空间方差 (WSV) 误差评估图像质量.
  • 测试了人肺通风和大鼠大脑活动的体内NBC和体内EIT数据.

主要成果:

  • 在所有测试条件 (在和实验条件下) 中,NBC在视觉上保持或提高了图像质量.
  • 在几乎所有情况下,NBC显著改善了WSV,这表明准确度提高了.
关键词:
电阻断层扫描电阻断层扫描图像重建 图像重建噪音传播的传播后处理 后处理 后处理

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  • 在体内,NBC提高了EIT数据质量,保留了重建的扰动形状.

    • 结论:

    • 基于噪声的校正 (NBC) 是一种有效的后处理技术,可以提高EIT图像质量.
    • 不相关的基于噪声的校正显示出优异的性能,并被推用于一般的EIT应用.