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相关概念视频

Magnetic Resonance Imaging01:24

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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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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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Nuclear magnetic resonance (NMR) is a phenomenon exhibited by certain nuclei that can absorb characteristic radio frequency radiation under certain conditions. NMR has been extensively applied in molecular spectroscopy and medical diagnostic imaging. In both these applications, the molecule or subject under study is placed in a magnetic field and irradiated with radio frequency energy.
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The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N-O and N=O bonds.
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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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Support reactions in three dimensions help maintain the stability and equilibrium of various structures and systems. These reactions prevent the system from translating and rotating, ensuring the design can withstand external forces and perform its intended function efficiently and safely. Some of the supports providing support reactions in three dimensions are discussed below:
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Estimating Bilateral Atrial Function by Cardiovascular Magnetic Resonance Feature Tracking in Patients with Paroxysmal Atrial Fibrillation
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在心血管磁共振中,自动测量角和三角形角尺寸.

Ricardo A Gonzales1, Jérôme Lamy2, Felicia Seemann3

  • 1Radcliffe Department of Medicine, University of Oxford, Oxford, UK.

Proceedings. IEEE International Symposium on Biomedical Imaging
|February 11, 2026
PubMed
概括

这项研究引入了一种使用心血管磁共振 (CMR) 测量中和三环形尺寸的自动化方法. 这种精确的技术有助于评估心脏功能和规划门干预.

关键词:
心血管磁共振是一种心血管磁共振.环形维度是一个环形维度.自动化维度测量自动化维度测量额头门的中枢门三管门的三管门

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科学领域:

  • 心血管成像 - 心血管成像
  • 人工智能在医学中的应用
  • 心脏机械学 心脏机械学

背景情况:

  • 准确评估心肌运动对于评估心脏功能至关重要.
  • 米特拉和三管的动态提供了透视透功能和反的见解.
  • 目前用于环形尺寸测量的方法可能是耗时和主观的.

研究的目的:

  • 开发和验证使用心血管磁共振 (CMR) 测量额头环状 (MA) 和三环状 (TA) 尺寸的自动化框架.
  • 评估自动测量的准确性和可重复性.
  • 评估这些测量在区分健康个体和心力衰竭患者之间的潜力.

主要方法:

  • 利用剩余的神经网络骨干自动测量CMR长轴线的MA和TA直径.
  • 采用时间分辨率CMR成像用于动态门运动分析.
  • 将自动测量与观察者之间的变化进行比较.

主要成果:

  • 自动化框架在测量MA和TA直径方面取得了极好的准确性 (平均ICC=0.92),与观察者之间的变异性 (平均ICC=0.92) 相比.
  • 在健康对照组和慢性心力衰竭患者之间观察到膜尺寸的显著差异 (p<0.001).
  • 该方法在对环形尺寸的定量评估中表现出强大的性能.

结论:

  • 使用CMR自动测量米特拉和三形环形尺寸是可行的,并且非常准确.
  • 该框架为定量评估膜尺寸提供了宝贵的工具,有助于诊断和治疗规划.
  • 这些发现支持使用这项技术来改善心血管疾病患者的管理.