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相关概念视频

¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

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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...
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Diffusion01:12

Diffusion

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Diffusion is the passive movement of substances down their concentration gradients—requiring no expenditure of cellular energy. Substances, such as molecules or ions, diffuse from an area of high concentration to an area of low concentration in the cytosol or across membranes. Eventually, the concentration will even out, with the substance moving randomly but causing no net change in concentration. Such a state is called dynamic equilibrium, which is essential for maintaining overall...
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Diffusion01:21

Diffusion

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Diffusion is a type of passive transport. In passive transport, a substance tends to move from an area of high concentration to an area of low concentration until the concentration is equal across the space. For example, take the diffusion of substances through the air. When someone opens a perfume bottle in a room filled with people, the perfume is at its highest concentration in the bottle and is at its lowest at the edges of the room. The perfume vapor will diffuse, or spread away, from the...
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Fast Decoupled and DC Powerflow01:24

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The fast decoupled power flow method addresses contingencies in power system operations, such as generator outages or transmission line failures. This method provides quick power flow solutions, essential for real-time system adjustments. Fast decoupled power flow algorithms simplify the Jacobian matrix by neglecting certain elements, leading to two sets of decoupled equations:
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Translation01:31

Translation

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Lesson: Translation
Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
Translation Produces the Building Blocks of...
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Initiation of Translation02:33

Initiation of Translation

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Initiating translation is complex because it involves multiple molecules. Initiator tRNA, ribosomal subunits, and eukaryotic initiation factors (eIFs) are all required to assemble on the initiation codon of mRNA. This process consists of several steps that are mediated by different eIFs.
First, the initiator tRNA must be selected from the pool of elongator tRNAs by eukaryotic initiation factor 2 (eIF2). The initiator tRNA (Met-tRNAi) has conserved sequence elements including modified bases at...
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相关实验视频

Updated: Jan 28, 2026

Diffusion Imaging in the Rat Cervical Spinal Cord
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FDDM:无监督医疗图像翻译与频率脱的扩散模型.

Yunxiang Li1, Hua-Chieh Shao1, Xiaoxue Qian1

  • 1Department of Radiation Oncology, UT Southwestern Medical Center, Dallas, 75390, TX, USA.

Machine learning: science and technology
|January 26, 2026
PubMed
概括
此摘要是机器生成的。

频率分离扩散模型 (FDDM) 通过在MR-to-CT转换中保存解剖结构来改善医疗图像翻译. 这种新型的扩散模型提高了诊断准确度,用于诸如放射治疗规划等任务.

关键词:
扩散模型的扩散模型生成模型的生成模型医学图像翻译 医学图像翻译

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Last Updated: Jan 28, 2026

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科学领域:

  • 医疗成像医学成像
  • 人工智能的人工智能
  • 图像处理 图像处理

背景情况:

  • 扩散模型对医学图像翻译有前途,但在解剖学准确性方面存在困难,尤其是在未配对数据方面.
  • 准确的翻译对于疾病诊断,定位和治疗计划至关重要.

研究的目的:

  • 引入频率分离扩散模型 (FDDM) 以实现高保真度的MR-to-CT图像转换.
  • 为了提高医疗图像翻译期间解剖结构的保存.

主要方法:

  • FDDM采用两阶段的方法:最初的解剖转换,然后是指导扩散过程.
  • 双路径反向扩散过程将低频和高频信息分开,以提高图像质量和解剖学准确度.

主要成果:

  • 在大脑和骨盆MR-to-CT数据集上,FDDM显著优于现有的GAN,VAE和基于扩散的模型.
  • 在FID,MAE,MSE,SSIM和DICE指标中取得了优异的成绩,特别是在FID中表现出色.
  • 证明了高质量的图像生成,同时保持了解剖结构的准确性.

结论:

  • FDDM提供了一个强大的解决方案,用于MR-to-CT转换,平衡图像质量与解剖学精度.
  • 该模型有助于更准确的下游应用,如解剖细分和放射治疗规划.