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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 I: CT and MRI01:14

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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

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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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Atomic Nuclei: Nuclear Relaxation Processes01:23

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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
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相关实验视频

Updated: Jun 10, 2025

Quantifying Mixing using Magnetic Resonance Imaging
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金属材料对磁共振图像均性的影响:一个定量实验研究.

Hiroaki Shimamoto1, Doaa Felemban2, Yuka Uchimoto3

  • 1Department of Oral and Maxillofacial Radiology, Osaka University Graduate School of Dentistry, 1-8 Yamadaoka, Suita, Osaka, 565-0871, Japan. shimamoto.hiroaki.dent@osaka-u.ac.jp.

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概括

像- (Co-Cr) 和 (Ti) 这样的金属材料可以显著降低磁共振 (MR) 图像的均性,特别是在渐变回声序列中. 这种效应归因于它们对磁场的高度易感性.

关键词:
图像的一致性 图像的一致性这就是为什么MRI是MRI.金属材料是金属材料.量化研究是指进行量化研究.

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科学领域:

  • 医疗成像医学成像
  • 材料科学 材料科学 材料科学
  • 生物医学工程 生物医学工程

背景情况:

  • 金属材料越来越多地用于医疗设备,引发了人们对其对磁共振 (MR) 成像的影响的担忧.
  • 评估金属植入物对MRI图像质量的影响对于准确的诊断和治疗计划至关重要.

研究的目的:

  • 用标准化的方法量化评估各种金属材料对MR图像统一性的影响.
  • 为了识别降低MR图像质量的特定金属材料.

主要方法:

  • 六种类型的1立方厘米金属材料 (Au,Ag,Al,Au-Ag-Pd合金,Ti,Co-Cr合金) 被嵌入到一个玻璃幻影中.
  • 扫描使用1.5TMRI扫描仪进行,使用T1加权旋回回声 (SE) 和梯度回声 (GRE) 序列,按照ASTM F2119-07标准进行扫描.
  • 使用非统一性指数 (NUI) 测量图像的统一性.

主要成果:

  • - (Co-Cr) 合金和 (Ti) 显著降低了MR图像的统一性,特别是在T1-GRE序列中.
  • Co-Cr 植入物导致统一性下降最为显著,效应延伸至6.6厘米.
  • 其他测试的金属材料 (Au,Ag,Al,Au-Ag-Pd合金) 对图像统一性没有显著影响.

结论:

  • 由于Co-Cr和Ti的存在,MR图像的统一性受到影响,受扫描序列和线圈类型的影响.
  • 观察到的图像不均性可能是由于Co-Cr和Ti的高磁性易感性.
  • 标准化的评估方法对于量化金属材料对MRI成像的影响至关重要.