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相关概念视频

Synthesis and Decomposition Reactions02:17

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Synthesis and decomposition are two types of redox reactions. Synthesis means to make something, whereas decomposition means to break something. The reactions are accompanied by chemical and energy changes. 
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Ureters01:22

Ureters

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The ureters are retroperitoneal tubes located on either side of the vertebral column. They are responsible for transporting urine from each kidney to the urinary bladder. These tubes have thick walls and are approximately 25-30 cm long. Their diameter is around 10 mm at the renal pelvis, gradually narrowing to 1 mm as the ureter obliquely enters the posterior bladder wall through the ureteric orifices. The shape of these orifices is slit-like, which helps to prevent urine backflow toward the...
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Light as Energy01:35

Light as Energy

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The energy required to carry out photosynthesis is light— typically electromagnetic radiation from the sun. The range of all possible wavelengths is known as the electromagnetic spectrum.
Photons
A photon is a discrete electromagnetic particle or bundle of energy. Photons are characterized by their frequency, wavelength, and amplitude, similar to the properties of a wave. Waves with higher frequencies transmit more energy and have shorter wavelengths than longer wavelengths that transmit...
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The universe is composed of matter in different forms, and all forms of matter contain energy.  The different forms of energy on Earth originate from the Sun — the ultimate energy source. Plants capture light energy from the Sun, and, via the process of photosynthesis, convert it into chemical energy. This stored energy from plants can be harnessed in many ways. For example, eating plant products as food provides energy for our body to function, and burning wood or coal (fossilized...
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Free Energy01:21

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Free energy—abbreviated as G for the scientist Gibbs who discovered it—is a measurement of useful energy that can be extracted from a reaction to do work. It is the energy in a chemical reaction that is available after entropy is accounted for. Reactions that take in energy are considered endergonic and reactions that release energy are exergonic. Plants carry out endergonic reactions by taking in sunlight and carbon dioxide to produce glucose and oxygen. Animals, in turn, break...
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The upper urinary system comprises two kidneys and two ureters, which are crucial in filtering blood and forming urine.KidneysLocation and Structure:The kidneys are two bean-shaped organs positioned behind the peritoneum on either side of the spine.Kidneys are between the 12th thoracic (T12) and the 3rd lumbar (L3) vertebrae.The position of the liver causes the right kidney to sit slightly lower than the left.Protective Layers:Each kidney is enveloped in a tough, fibrous membrane called the...
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Gene Regulation and Targeted Therapy in Gastric Cancer Peritoneal Metastasis: Radiological Findings from Dual Energy CT and PET/CT
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用双能量CT两种材料分解生成尿管细分的训练数据.

Dae Chul Jung1, Jungwook Lee2, Seungsoo Lee3

  • 1Department of Radiology, Severance Hospital, Research Institute of Radiological Science, Yonsei University College of Medicine, Seoul, Republic of Korea.

Journal of imaging informatics in medicine
|January 26, 2026
PubMed
概括
此摘要是机器生成的。

双能CT (DECT) 有效地产生训练数据,用于用两种材料分解进行尿管细分. 虽然对非对比CT尿管细分有希望,但外部验证显示性能有限.

关键词:
深度学习是一种深度学习.双能量计算机断层扫描技术图像细分 图像细分 图像细分在UreterUreter中使用.虚拟无增强成像 虚拟无增强成像

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科学领域:

  • 医疗成像医学成像
  • 放射学中的人工智能
  • 泌尿外科成像 泌尿外科成像

背景情况:

  • 精确的尿管细分对于诊断和管理各种泌尿病状况至关重要.
  • 深度学习模型需要大量高质量的数据集,以进行有效的培训.
  • 产生尿道的细分面具,特别是非对比CT,存在挑战.

研究的目的:

  • 评估使用基于双能CT (DECT) 的两种材料分解来创建尿管细分的训练数据的可行性.
  • 开发和评估使用DECT衍生虚拟未增强 (VUE) 图像进行尿管细分的深度学习模型.

主要方法:

  • 一项回顾性研究,涉及180名接受DECT泌尿镜检查的患者.
  • 虚拟未增强 (VUE) 图像是从晚分泌阶段 (LEP) DECT图像中合成的,使用两种材料分解.
  • 在LEP图像上生成了地面真相细分面具,并与VUE图像配对形成训练数据集.
  • 在内部和外部数据集上训练和验证了一个深度学习模型 (nnU-Net框架).

主要成果:

  • 内部测试数据集实现了高性能:中位数Dice系数为0.89,精度为0.90,回忆率为0.88.
  • 外部验证显示性能有限:中位数Dice系数为0.43和回忆率为0.28,精度高 (0.95).
  • 在内部和外部验证数据集之间的所有指标中观察到具有统计学意义的差异 (P < 0.01).

结论:

  • 基于DECT的两种材料分解是一种可行的方法,用于生成尿管细分的训练数据.
  • 该方法显示了在非对比CT扫描上尿管细分的潜力,尽管外部验证的局限性.
  • 需要进一步的研究和多中心验证,以提高概括性和临床适用性.