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相关概念视频

Computed Tomography01:10

Computed Tomography

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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...
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Imaging Studies III: Computed Tomography01:27

Imaging Studies III: Computed Tomography

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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...
536
Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview

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Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
The ATR process begins by directing a beam...
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Electron Microscope Tomography and Single-particle Reconstruction01:07

Electron Microscope Tomography and Single-particle Reconstruction

3.0K
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...
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Positron Emission Tomography01:29

Positron Emission Tomography

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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.
One of the main requirements of a PET scan is a positron-emitting radioisotope, which is produced in a cyclotron and then attached to a substance used by the part of the body...
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Plane Electromagnetic Waves I01:30

Plane Electromagnetic Waves I

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The existence of combined electric and magnetic fields that propagate through space as electromagnetic (EM) waves is the most significant prediction of Maxwell's equations. As Maxwell's equations hold in free space, the predicted electromagnetic waves do not require a medium for their propagation. An EM wave comprises an electric field, defined as the force per charge on a stationary charge, and a magnetic field, which is the force per charge on a moving charge.
The EM field is assumed to be a...
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Updated: Mar 12, 2026

Terahertz Imaging and Characterization Protocol for Freshly Excised Breast Cancer Tumors
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基于特拉赫兹计算断层扫描的一般化平面波谱的倒置方法.

Tianqi Feng1, Chengyong Yu2, Yu Shi1

  • 1School of Integrated Circuit Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China.

The Review of scientific instruments
|March 11, 2026
PubMed
概括
此摘要是机器生成的。

这项研究引入了一种新的太赫兹计算断层扫描 (THz-CT) 倒置方法,该方法可以解释角散射. 该方法提高了各种材料的重建精度,提高了非破坏性测试能力.

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科学领域:

  • 物理 物理学 物理
  • 电磁学 电磁学 电磁学 电磁学
  • 影像科学 影像科学

背景情况:

  • 来自X射线CT的太赫兹计算断层扫描 (THz-CT) 方法通常使用变换并假定直线传播.
  • 这些传统方法忽略了太赫兹波散射现象,如折射和角散射,导致重建不准确.
  • 现有的研究往往忽略了角散射对THz-CT性能的影响.

研究的目的:

  • 提出一种新的THz-CT反转方法,该方法包含角散射特征.
  • 为了解决理论平面波假设和实验高斯波束条件之间的差异.
  • 为了验证不同材料类型的拟议方法的准确性和可行性.

主要方法:

  • 基于一般化的平面波谱的倒置算法的开发,以模拟分层结构中的角散射.
  • 引入一个场校正,使理论平面波分析与实验高斯波束条件相协调.
  • 使用定制的角散射现场测试系统进行实验验证,并与有序子集预期最大化 (OSEM) 方法进行比较.

主要成果:

  • 拟议的反转方法准确地重建了太赫兹计算机断层扫描数据,并考虑了角散射.
  • 与OSEM的实验比较表明,拟议方法的精度更高.
  • 该方法在PEC (完美电导体) 样品中显示出高精度,并且在介电材料中显示出可行性.

结论:

  • 开发的反转方法有效地处理THz-CT中的角散射,提高重建质量.
  • 场校正成功地弥合了理论模型和实验设置之间的差距.
  • 这种技术提供了一种更准确和更通用的方法,用于使用THz-CT进行非破坏性测试,适用于导电和介电材料.