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相关概念视频

Deconvolution01:20

Deconvolution

198
Deconvolution, also known as inverse filtering, is the process of extracting the impulse response from known input and output signals. This technique is vital in scenarios where the system's characteristics are unknown, and they must be inferred from the observable signals.
Deconvolution involves several mathematical techniques to derive the impulse response. One common approach is polynomial division. In this method, the input and output sequences are treated as coefficients of...
198
¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

1.1K
The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
1.1K
IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations01:08

IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations

1.1K
Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single...
1.1K
¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

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

1.1K
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...
1.1K
Upsampling01:22

Upsampling

266
Managing signal sampling rates is essential in digital signal processing to maintain signal integrity. A decimated signal, characterized by a reduced frequency range due to its lower sampling rate, can be upsampled by inserting zeros between each sample. This upsampling process expands the original spectrum and introduces repeated spectral replicas at intervals dictated by the new Nyquist frequency. To refine this zero-inserted sequence, it is passed through a lowpass filter with a cutoff...
266

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SSN2V:无人监督的OCT使用斑点分割去噪音.

Julia Schottenhamml1, Tobias Würfl2, Stefan B Ploner2

  • 1Pattern Recognition Lab, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany. julia.schottenhamml@fau.de.

Scientific reports
|June 27, 2023
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概括
此摘要是机器生成的。

这项研究引入了一种新的无监督光学连贯性断层扫描 (OCT) 消极化方法. 该算法有效地减少了斑点噪声,同时保留了关键的血流信息,以便更清晰的视网膜成像.

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科学领域:

  • 生物医学成像技术 生物医学成像技术
  • 医学图像分析 医学图像分析
  • 光学连贯性断层扫描技术

背景情况:

  • 光学连贯断层扫描 (OCT) 中的斑点噪声会降低图像质量,原因是信号与噪声比较低.
  • 现有的无色化方法往往不分青红白地去除斑点,失去宝贵的血流信息或导致图像模糊.
  • 无监督的清除噪音至关重要,因为没有噪音的OCT扫描是无法实现的.

研究的目的:

  • 开发一个无监督的OCT无噪声算法,可以减少噪声,同时保留与流量相关的斑点信息.
  • 为了解决目前方法的局限性,这些方法要么不充分揭示图像,要么产生模糊图像.
  • 通过保持图像清晰度来提高OCT的临床实用性.

主要方法:

  • 开发了一个完全不受监督的算法,用于单OCT无声化 (SSN2V).
  • 该算法将已知的运算符纳入神经网络架构中的约束.
  • 这种方法区分噪声和流量信息在speckle.

主要成果:

  • 拟议的SSN2V方法有效地减少了人类视网膜OCT B扫描中的斑点噪声.
  • 该算法成功地保存了与流动相关的斑点信息,保持了图像的清晰度.
  • 定量和定性评估与现有方法相比显示出更高的性能.

结论:

  • 通过SSN2V算法,在无监督的OCT报警方面取得了重大进展.
  • 在降低噪音的同时保护流量信息,可以提高临床应用的图像质量.
  • 这种方法通过提供更清晰,更清晰的视网膜可视化,提高了OCT成像的诊断潜力.