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相关概念视频

Solenoids01:17

Solenoids

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A solenoid is a conducting wire coated with an insulating material, wound tightly in the form of a helical coil. The magnetic field for a solenoid is the vector sum of the magnetic field due to its individual turns. For an ideal solenoid, the magnetic field inside is almost uniform and parallel to the solenoid axis, while the magnetic field outside the solenoid is nearly zero.
Each turn in a solenoid can be approximated as a circular current carrying coil that generates a dipole moment. The...
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Magnetic Field of a Solenoid01:18

Magnetic Field of a Solenoid

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A solenoid is a conducting wire coated with an insulating material, wound tightly in the form of a helical coil. The magnetic field due to a solenoid is the vector sum of the magnetic fields due to its individual turns. Therefore, for an ideal solenoid, the magnetic field within the solenoid is directly proportional to the number of turns per unit length and the current. Conversely, the magnetic field outside the solenoid is zero.
Consider a solenoid with 100 turns wrapped around a cylinder of...
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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

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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相关实验视频

Updated: Jun 7, 2025

MRM Microcoil Performance Calibration and Usage Demonstrated on Medicago truncatula Roots at 22 T
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MRM Microcoil Performance Calibration and Usage Demonstrated on Medicago truncatula Roots at 22 T

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浮动电磁球为MRI使用.

Ming Lu1,2, Yijin Yang3, Shuyang Chai1,3

  • 1Vanderbilt University Institute of Imaging Science, Vanderbilt University Medical Center, Nashville, Tennessee, USA.

NMR in biomedicine
|November 9, 2024
PubMed
概括

新的浮动电磁球为MRI射频线圈提供了卓越的常态排斥. 这种紧的,可调节的设计提高了可用性和MRI性能,与传统的巴祖卡球相比.

关键词:
射频线圈是一个RF线圈.巴伦巴伦 (Balun Balun) 是一个非常古老的城市.电缆陷 电缆陷 电缆陷常态电流是常态电流.漂浮式气球 漂浮式气球

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Functional Neuroimaging Using Ultrasonic Blood-brain Barrier Disruption and Manganese-enhanced MRI
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Functional Neuroimaging Using Ultrasonic Blood-brain Barrier Disruption and Manganese-enhanced MRI

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Electric and Magnetic Field Devices for Stimulation of Biological Tissues
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Electric and Magnetic Field Devices for Stimulation of Biological Tissues

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相关实验视频

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科学领域:

  • 医疗成像医学成像
  • 电气工程 电气工程
  • 无线电频率工程 无线电频率工程

背景情况:

  • 气球是磁共振成像 (MRI) 射频 (RF) 线圈中的关键组件.
  • 它们对于抑制常态电流,保持信号噪声比 (SNR) 和确保MRI过程中患者安全至关重要.

研究的目的:

  • 介绍和评估新型的浮式电磁球 balun.
  • 将其性能与已建立的浮动巴祖卡弹进行比较.
  • 评估其适用于现代,紧的MRI系统的适用性.

主要方法:

  • 进行了电磁模拟.
  • 在静态磁场 (1.5 T,3 T,7 T) 下进行了基板测试.
  • 对比分析的重点是常态排斥率 (CMRR).

主要成果:

  • 浮动电磁气球表现出优越的常态排斥与浮动巴祖卡气球在测试的场强度相比.
  • 浮动电磁气球具有紧的尺寸和安装后的可调性.
  • 它消除了在电缆屏上接的需要,简化了实施.

结论:

  • 浮动电磁球为MRI射频线圈设计带来了重大进步.
  • 它的紧尺寸和易用性解决了当前巴伦技术的局限性.
  • 这项创新有可能提高MRI性能,并实现更密集的射频线圈阵列.