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相关概念视频

Computed Tomography01:10

Computed Tomography

8.0K
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...
8.0K
Imaging Studies III: Computed Tomography01:27

Imaging Studies III: Computed Tomography

280
DefinitionComputed Tomography (CT) of the genitourinary (GU) tract is a non-invasive imaging modality that utilizes X-rays and computer processing to generate detailed cross-sectional images of the urinary system, encompassing the kidneys, ureters, bladder, and adjacent structures such as the adrenal glands.PurposeCT scans of the GU tract serve several diagnostic and therapeutic purposes, including:Diagnosis of Urinary Tract Diseases: Detects kidney stones, tumors, cysts, and congenital...
280
NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

1.0K
When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
1.0K
Inertia Tensor01:24

Inertia Tensor

1.1K
The concept of the inertia tensor is employed to depict the mass distribution and rotational inertia of a solid or rigid object. This tensor is expressed through a three-by-three matrix. Each component within this matrix corresponds to varying moments of inertia about specific axes.
The diagonal components of the inertia tensor matrix represent the moments of inertia concerning the principal axes of the object. These primary axes are defined as the axes where the object experiences the least...
1.1K

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相关实验视频

Updated: Jan 13, 2026

Diffusion Imaging in the Rat Cervical Spinal Cord
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Diffusion Imaging in the Rat Cervical Spinal Cord

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在张量断层扫描中对异型吸收进行计算校正.

Mads Carlsen1, Marianne Liebi1

  • 1Center for Photon Science, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland.

Journal of synchrotron radiation
|October 28, 2025
PubMed
概括

在X射线散射张量断层扫描中无otropic 吸收通常被忽视. 这项研究模拟并纠正了这种效应,发现传统方法适合典型的X射线散射和吸收水平.

科学领域:

  • 物理 物理学 物理
  • 材料科学 材料科学 材料科学
  • 晶体学 晶体学是指结晶学.

背景情况:

  • 射线散射张量断层扫描对样品几何非常敏感.
  • 散射X射线的无otropic吸收是重建算法中未得到解决的一个问题.
  • 宏观样本几何学可以诱导异构吸收.

研究的目的:

  • 为了研究X射线散射张量断层扫描中异构吸收的影响.
  • 开发和验证用于纠正异型吸收的计算方法.
  • 将模拟结果与实验数据进行比较.

主要方法:

  • 进行X射线散射张量断层扫描的模拟研究.
  • 开发一种计算校正方法,用于异型吸收.
  • 分析来自氧酸盐的实验性X射线散射数据.

主要成果:

  • 不同类型的吸收显著影响X射线散射张量断层扫描在大角度.
  • 拟议的计算方法有效地纠正了异型吸收.
  • 模拟显示的趋势与酸的实验数据一致.

结论:

关键词:
电脑断层扫描是X射线衍射计算的.在X射线中,散射是X射线的散射.异型吸收异型吸收张量断层扫描 (tensor tomography) 是一种张量断层扫描.

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  • 异性吸收是X射线散射张量断层扫描中的一个相关因素.
  • 传统的传动校正方法在典型的实验条件下是足够的.
  • 对于极端的吸收或散射角度可能需要进一步的研究.