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相关概念视频

Group Polarization01:01

Group Polarization

Group polarization is the strengthening of an original group attitude following the discussion of views within a group (Teger & Pruitt, 1967). That is, if a group initially favors a viewpoint, after discussion the group consensus is likely a stronger endorsement of the viewpoint. Conversely, if the group was initially opposed to a viewpoint, group discussion would likely lead to stronger opposition.
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...
Imaging Biological Samples with Optical Microscopy01:18

Imaging Biological Samples with Optical Microscopy

Optical microscopy uses optic principles to provide detailed images of samples. Antonie van Leeuwenhoek designed the first compound optical microscope in the 17th century to visualize blood cells, bacteria, and yeast cells. In 1830, Joseph Jackson Lister created an essentially modern light microscope. The 20th century saw the development of microscopes with enhanced magnification and resolution.
In optical microscopy, the specimen to be viewed is placed on a glass slide and clipped on the stage...
Electron Microscope Tomography and Single-particle Reconstruction01:07

Electron Microscope Tomography and Single-particle Reconstruction

Transmission electron microscopy (TEM) can be used to determine the 3D structure of biological samples with the help of techniques such as electron microscope tomography and single-particle reconstruction. While single-particle reconstruction can examine macromolecules and macromolecular complexes in vitro conditions only, tomography permits the study of cell components or small cells in vivo.
Electron Tomography
Electron tomography can be performed either in TEM or STEM (scanning transmission...
Computed Tomography01:10

Computed Tomography

Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
The technique was invented in the 1970s and is based on the principle that as X-rays pass through the body, they are absorbed or reflected at different levels. In the technique, a patient lies on a motorized platform while a computerized axial tomography (CAT) scanner rotates...
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)01:15

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)

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...

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相关实验视频

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Integrated Photoacoustic Ophthalmoscopy and Spectral-domain Optical Coherence Tomography
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压缩传感用于偏振敏感的光学连贯性断层扫描.

Jianfeng Wang1, Eric J Chaney1, Edita Aksamitiene1

  • 1Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, United States of America.

Journal of physics D: Applied physics
|January 15, 2024
PubMed
概括
此摘要是机器生成的。

压缩传感 (CS) 和稀疏采样加速了极化敏感光学连贯断层扫描 (PS-OCT) 成像. 这种方法使用50%的B扫描重建体积PS-OCT数据,有效地加倍获取速度.

关键词:
压力感应感应 压力感应感应极化敏感的光学连贯性断层扫描仪稀疏采样 稀疏采样 稀疏采样

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科学领域:

  • 生物医学光学 生物医学光学
  • 医学成像技术 医学成像技术

背景情况:

  • 极化敏感光学连贯断层扫描 (PS-OCT) 提供了有价值的微观结构和双断层信息.
  • 获取完整的体积PS-OCT数据集需要大量的B扫描,限制成像速度.
  • 压缩传感 (CS) 和稀疏采样为加速数据采集提供了潜在的解决方案.

研究的目的:

  • 实施和评估压力传感 (CS) 和稀疏采样,以减少体积PS-OCT中的B扫描采集.
  • 评估重建PS-OCT数据的可行性,使用显著减少B扫描.
  • 确定降低B扫描速率对重建的PS-OCT测量的准确性和质量的影响.

主要方法:

  • 通过随机化步骤大小沿着PS-OCT成像缓慢轴实施稀疏采样.
  • 应用压力传感 (CS) 算法,从低样本B扫描中重建体积PS-OCT数据.
  • 在缺失的B扫描率为25%,50%和75%的情况下,使用相关系数评估了重建的准确性.

主要成果:

  • CS成功地重建了相当好的PS-OCT测量 (相关系数>0.6),即使B扫描缺失高达50%.
  • 使用CS稀疏采样使得需要的B扫描数量大大减少.
  • 该方法证明了加速体积PS-OCT测量的潜力,有效地使收购率翻一番.

结论:

  • 压缩传感与稀疏采样相结合是加速体积PS-OCT获取的有效策略.
  • 这种方法允许高质量的PS-OCT数据重建,并且大大减少了扫描时间.
  • 这些发现表明,更快的体内和体外PS-OCT成像应用的可行途径.