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相关概念视频

Computed Tomography01:10

Computed Tomography

4.6K
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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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...
4.3K
Imaging Studies III: Computed Tomography01:27

Imaging Studies III: Computed Tomography

30
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...
30
Electron Microscope Tomography and Single-particle Reconstruction01:07

Electron Microscope Tomography and Single-particle Reconstruction

2.4K
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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Imaging Studies II: Positron Emission Tomography and Scintigraphy01:25

Imaging Studies II: Positron Emission Tomography and Scintigraphy

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Positron Emission Tomography (PET) is a medical imaging technique that provides crucial insights into the body's physiological functions at a molecular level. It is an indispensable resource for diagnosing, staging, and monitoring various illnesses, notably cancer, neurological disorders, and cardiovascular conditions.
Fundamental Principles of PET
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Computed Tomography-guided Time-domain Diffuse Fluorescence Tomography in Small Animals for Localization of Cancer Biomarkers
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[CT技术:光子计数探测器计算机断层扫描]

Yannik Christian Layer1, Dmitrij Kravchenko2, Tatjana Dell2

  • 1Klinik für Diagnostische und Interventionelle Radiologie, Universitätsklinikum Bonn, Venusberg-Campus 1, 53127, Bonn, Deutschland. yannik.layer@ukbonn.de.

Radiologie (Heidelberg, Germany)
|June 8, 2023
PubMed
概括
此摘要是机器生成的。

光子计数探测器计算机断层扫描 (PCD-CT) 提供了优越的成像,可减少辐射剂量和提高分辨率. 这种先进的CT技术比传统方法显著改进,为新的临床应用铺平了道路.

关键词:
提供图像质量的质量.用光子计数检测器进行检测.辐射剂量 辐射剂量空间分辨率的空间分辨率频谱成像技术的使用.

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Visualization of Low-Level Gamma Radiation Sources Using a Low-Cost, High-Sensitivity, Omnidirectional Compton Camera
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A Basic Positron Emission Tomography System Constructed to Locate a Radioactive Source in a Bi-dimensional Space
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Computed Tomography-guided Time-domain Diffuse Fluorescence Tomography in Small Animals for Localization of Cancer Biomarkers
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Visualization of Low-Level Gamma Radiation Sources Using a Low-Cost, High-Sensitivity, Omnidirectional Compton Camera
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A Basic Positron Emission Tomography System Constructed to Locate a Radioactive Source in a Bi-dimensional Space
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科学领域:

  • 医学成像技术 医学成像技术
  • 辐射物理学 辐射物理学

背景情况:

  • 光子计数探测器计算机断层扫描 (PCD-CT) 使用直接的光子到电信号的转换.
  • 这项技术克服了传统探测器的局限性,使得光谱评估和减少辐射暴露成为可能.
  • PCD-CT通过减少电子噪声和消除探测器隔离来提高空间分辨率和剂量效率.

研究的目的:

  • 评估光子计数探测器计算机断层扫描的进展和临床潜力.
  • 要突出PCD-CT.提供的图像质量和辐射剂量效率的改善.
  • 讨论光谱成像能力在PCD-CT中的影响.

主要方法:

  • 对PCD-CT性能最近的研究结果的审查.
  • 分析图像质量指标,包括噪音,空间分辨率和文物减少.
  • 评估光谱成像应用程序,如虚拟单能和非对比图像.

主要成果:

  • PCD-CT显示,图像噪声和辐射剂量显著降低.
  • 增强的空间分辨率和改进的信号检测得到证实.
  • 光谱成像能够实现先进的应用,如虚拟成像和映射,具有多相成像的潜力.

结论:

  • 第一个PCD-CT设备于2021年获得临床批准,显示出其优于标准CT的优势.
  • 需要进一步的研究,以获得最佳的设置,验证和探索新的临床应用.
  • 在高分辨率成像和需要高辐射剂量的检查方面,PCD-CT非常出色.