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相关概念视频

Magnetic Resonance Imaging01:24

Magnetic Resonance Imaging

5.3K
Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...
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Imaging Studies I: CT and MRI01:14

Imaging Studies I: CT and MRI

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Introduction: MRI and CT scans are crucial advancements in medical imaging techniques, playing a vital role in diagnosing conditions related to the gastrointestinal (GI) system. Each scan serves distinct purposes, targets specific areas, and requires unique nursing duties.
Description of the Procedures
Computed Tomography (CT) scan:
Computed Tomography (CT) scans use X-ray technology to generate detailed images of bones, organs, and tissues. During the scan, the patient lies on a moving table...
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Imaging Studies for Cardiovascular System IV: CMRI01:21

Imaging Studies for Cardiovascular System IV: CMRI

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Cardiovascular magnetic resonance imaging, or CMRI, is a non-invasive diagnostic test that employs a magnetic field and radiofrequency waves to create precise images of the heart and arteries. It provides comprehensive information about cardiac anatomy, function, perfusion, and tissue characterization without ionizing radiation.IndicationsCMRI diagnoses various heart conditions, including tissue damage from heart attacks, ischemic heart disease, myocarditis, aortic issues (tears, aneurysms,...
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Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

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The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
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Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
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Preparation and In Vitro Characterization of Dendrimer-based Contrast Agents for Magnetic Resonance Imaging
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动态可切换的磁共振成像对比剂 磁共振成像对比剂

Qiyue Wang1,2, Zeyu Liang1,2, Fangyuan Li1,2

  • 1Institute of Pharmaceutics, College of Pharmaceutical Sciences Zhejiang University Hangzhou Zhejiang P. R. China.

Exploration (Beijing, China)
|June 16, 2023
PubMed
概括
此摘要是机器生成的。

动态可切换的MRI对比剂通过改变疾病环境中的结构和功能来改善成像. 未来与超高场MRI的整合有望实现微观病变的非侵入性检测.

关键词:
动态MRI对比剂 动态MRI对比剂医学诊断 医学诊断 医学诊断微环境刺激的微环境刺激

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科学领域:

  • 医疗成像医学成像
  • 纳米技术 纳米技术
  • 生物医学工程 生物医学工程

背景情况:

  • 对比剂通过改变水质子放松时间来提高磁共振成像 (MRI) 的灵敏度和分辨率.
  • 磁力共振成像的性能与对比剂的结构特征,如尺寸,形状和表面变化密切相关.
  • 动态切换的对比剂是最近的进步,能够在疾病微环境中进行结构变化和功能激活.

研究的目的:

  • 要突出动态MRI对比剂的设计原则.
  • 讨论它们可控制的结构转换和可调节的成像特性.
  • 为了应对医疗诊断当前的挑战和未来的前景.

主要方法:

  • 对动态MRI对比剂的巧妙设计的审查.
  • 对可控制的结构转型机制的分析.
  • 评估可调节的成像属性调制.

主要成果:

  • 动态对比剂具有可适应的结构和成像特性.
  • 它们的性能通过智能设计和环境响应性来优化.
  • 在临床翻译中,对于准确的医学诊断仍然存在挑战.

结论:

  • 动态MRI对比剂为高性能MRI提供了先进的功能.
  • 未来与超高场MRI技术的整合可以使微观病变的非侵入性,本病理水平检测成为可能.
  • 需要进一步的研究来克服当前的诊断挑战.