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相关概念视频

Magnetic Resonance Imaging01:24

Magnetic Resonance Imaging

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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 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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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 IV: Magnetic Resonance Imaging01:27

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Introduction:Magnetic Resonance Imaging, or MRI, can include a specialized imaging technique of the urinary system known as Magnetic Resonance Urography (MRU). This radiation-free technique uses strong magnetic fields and radio waves to produce detailed images with the help of a computer. MRU is particularly effective for visualizing fluid-filled structures like the kidneys, ureters, and bladder.Applications of MRI in the Genitourinary SystemKidneys and Ureters: MRI detects tumors, cysts,...
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相关实验视频

Updated: Jan 17, 2026

Magnetic Resonance Imaging of Multiple Sclerosis at 7.0 Tesla
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在肌肉中植入永久磁铁的MRI安全考虑.

Cameron R Taylor1,2, Eric D Anttila3, Steven J Charlebois3

  • 1K. Lisa Yang Center for Bionics, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA.

Journal of magnetic resonance imaging : JMRI
|September 17, 2025
PubMed
概括

永久磁铁植入物用于假肢控制在MRI中显示无迁移和最小的去磁化,长达1.5T. 这些发现表明,这些植入物患者可以安全地接受MRI扫描.

关键词:
核磁共振成像 (MRI) 的条件性肌肉内植入物是一种植入物.磁性植入物是一种磁性植入物.永久磁铁植入体的使用方法

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科学领域:

  • 生物医学工程 生物医学工程
  • 材料科学 材料科学 材料科学
  • 放射学 放射学是一门学科.

背景情况:

  • 永久磁体植入物用于各种医疗设备,包括耳植入物和假肢控制器.
  • 由于与磁共振成像 (MRI) 的潜在相互作用,它们的使用需要谨慎使用.
  • 之前的研究评估了磁铁稳定性和图像工件,但用于假肢的肌肉磁铁需要进一步评估MRI条件.

研究的目的:

  • 评估植入肌肉的3毫米直径球形永久磁铁的位置和磁化稳定性.
  • 在MRI条件下评估这些植入物产生的图像工件.

主要方法:

  • 进行了一项前性纵向研究,使用猪模型在八个肌肉中植入磁铁.
  • 组织学检查评估了植入物迁移和纤维性反应,并补充了CT成像用于二次分析.
  • 基板研究量化了最坏的情况下的去磁化和MRI图像文物大小.

主要成果:

  • 组织学分析显示,磁铁和对照点周围的纤维囊完好无损,表明没有显著的迁移.
  • 在0.55-T和1.5-T的MRI暴露没有影响植入物迁移 (p>0.96).
  • 在1.5-T时,最大的去磁化率为13.5%,图像工件延长至71mm.

结论:

  • 研究的永久磁体植入物在0.55-T和1.5-TMRI下表现出对迁移的抗性和实质性的去磁化.
  • 观察到可以忽略不计的图像工件,这表明这些植入物不禁用MRI,直到1.5T.
  • 患有这些肌肉内永久磁体植入物的患者可能可以安全地接受MRI成像.