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相关概念视频

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...

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相关实验视频

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一般化通道分离算法用于准确的基于相机的多波长PTT和BP估计.

Gašper Slapničar1,2, Wenjin Wang3, Mitja Luštrek1,2

  • 1Department of Intelligent Systems, Jožef Stefan Institute, Jamova cesta 39, 1000 Ljubljana, Slovenia.

Biomedical optics express
|June 10, 2024
PubMed
概括

这项研究引入了使用多波长 (MW) 脉冲过渡时间 (PTT) 进行无接触血压监测的新算法. 数据驱动的方法有效地分离了颜色通道,从摄像头数据中实现了精确的血压估计.

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科学领域:

  • 生物医学工程 生物医学工程
  • 光学传感传感器是什么?
  • 生理监测 生理监测

背景情况:

  • 多波长 (MW) 脉冲过渡时间 (PTT) 能够持续监测血压 (BP),但在基于接触的方法中受到皮肤压缩的挑战.
  • 将MW PTT扩展到非接触式摄像头传感受阻碍了RGB摄像头的颜色通道重叠,混合波长响应并阻止准确的PTT测量.

研究的目的:

  • 开发和验证新的独立于摄像头的,基于数据的通道分离算法,用于无接触的MW PTT和BP估计.
  • 为了克服消费者RGB摄像头中颜色通道重叠的局限性,用于生理信号采集.

主要方法:

  • 提出了新的独立于相机的数据驱动的通道分离算法,利用受约束的遗传算法.
  • 系统验证的算法在摄像机记录的手掌和地面真实BP测量从13名受试者在休息和活动场景.
  • 将拟议的算法与既有盲源分离方法和特定于相机的基于物理的方法进行比较.

主要成果:

  • 性能最好的算法在一个留下一个受试者的个性化实验中,达到缩BP的3.48 mmHg和缩BP的2.61 mmHg的平均绝对误差 (MAE).
  • 在使用随机森林回归器进行PTT重建和BP估计时表现良好.
  • 拟议的算法有效地解决了颜色通道重叠问题,从摄像头数据中实现了有意义的PTT测量.

结论:

  • 开发的算法使新的,无接触的MW PTT和BP估计成为可能.
  • 这种方法为使用随时可用的摄像头技术进行非侵入性,持续的血压监测提供了一个有希望的途径.
  • 数据驱动的通道分离方法为克服基于摄像头的生理传感方面的挑战提供了强大的解决方案.