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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
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Radiation: Applications

The average temperature of Earth is the subject of much current discussion. Earth is in radiative contact with both the Sun and dark space; it receives almost all its energy from the radiation of the Sun and reflects some of it into outer space. Dark space is very cold, about 3 K, so Earth radiates energy into it. For instance, heat transfer occurs from soil and grasses, the rate of which can be so rapid that frost can occur on clear summer evenings, even in warm latitudes.
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German physicist Wilhelm Röntgen (1845–1923) was experimenting with electrical current when he discovered that a mysterious and invisible "ray" would pass through his flesh but leave an outline of his bones on a screen coated with a metal compound. In 1895, Röntgen made the first durable record of the internal parts of a living human: an "X-ray" image (as it came to be called) of his wife’s hand. Scientists worldwide quickly began their own experiments with X-rays, and by 1900, X-ray was widely...
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Positron emission tomography (PET) is a medical imaging technique involving radiopharmaceuticals — substances that emit short-lived radiation. Although the first PET scanner was introduced in 1961, it took 15 more years before radiopharmaceuticals were combined with the technique and revolutionized its potential.
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在粒子治疗中使用康普顿摄像机数据进行范围验证之前,具有光束前的规范化起源组合.

Jona Kasprzak1, Jorge Roser1,2, Julius Werner1

  • 1Institute of Medical Engineering, Universität zu Lübeck, Lübeck, Germany.

Physics in medicine and biology
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PubMed
概括

这项研究引入了一种新方法,即光束先前起源组合 (BP-OE),以改善粒子治疗成像中的范围转移检测. 与传统方法相比,BP-OE显著提高了图像质量和准确性.

关键词:
在吉布斯之前,吉布斯的先行者.之前的光束之前的光束康普顿摄像机 康普顿摄像机图像重建 图像重建起源组合 起源组合组合微粒疗法是一种微粒疗法.规范化 规范化 规范化

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科学领域:

  • 医学物理 医学物理
  • 图像重建 图像的重建
  • 微粒疗法是一种微粒疗法.

背景情况:

  • 颗粒疗法 (PT) 需要精确的范围验证,以最大限度地减少边缘并确保治疗的准确性.
  • 使用康普顿摄像头 (CC) 的快速马成像是一种有前途的技术,用于在PT期间实时监控.
  • 对于CC图像重建的常规原始组合 (OE) 算法存在文物和噪声,这限制了它们在检测范围转移方面的有效性.

研究的目的:

  • 用康普顿相机成像来提高粒子治疗中范围转移识别的准确性.
  • 为了提高康普顿摄像机重建图像的图像质量.
  • 开发一个规范化的Origin Ensemble算法,结合光束的先验知识.

主要方法:

  • 使用吉布斯的分布函数实现了光束预测,以规范原始组合 (OE) 算法,创建了BP-OE方法.
  • 在GATE中进行蒙特卡罗模拟,使用PMMA目标上的治疗光束,通过空气层引入距离转移,并模拟现实的骨层.
  • 使用溢出比率 (SOR) 和远端沉降转移分析对传统OE进行评估BP-OE.

主要成果:

  • BP-OE提高了距离偏移估计准确度,在中心束中提高了11%,在离中心束中提高了250%.
  • 使用BP-OE观察到图像噪声的显著减少,导致溢出比率 (SOR) 提高了96%.
  • 基于吉布斯的规范化框架显示了结合额外先验的潜力,例如光滑或边缘保护功能.

结论:

  • 拟议的BP-OE方法提供了优越的范围转移估计和图像质量,与传统的OE相比,用于基于康普顿摄像头的颗粒疗法监测.
  • 开发的规范化框架是多功能性的,可以扩展到其他成像模式,如PET或复杂的多束场景.
  • 在粒子治疗中,BP-OE代表了确保治疗准确性和安全性的重大进步.