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相关概念视频

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.
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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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Radiological Investigation II: MRI and Ventilation Perfusion Scan01:30

Radiological Investigation II: MRI and Ventilation Perfusion Scan

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Description
Magnetic Resonance Imaging (MRI) and Ventilation Perfusion Scans are two radiological investigations that offer detailed diagnostic images of the body, particularly lung structures.
MRI
MRI uses magnetic fields and radiofrequency signals to distinguish between normal and abnormal tissues. This technology provides a more detailed diagnostic image than CT scans, enabling it to characterize pulmonary nodules, stage bronchogenic carcinoma, and evaluate inflammatory activity in...
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Rapidly Varying Flow01:24

Rapidly Varying Flow

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Rapidly varying flow (RVF) in open channels is characterized by abrupt changes in flow depth over a short distance, with the rate of depth change relative to distance often approaching unity. These flows are inherently complex due to their transient and multi-dimensional nature, making exact analysis difficult. However, approximate solutions using simplified models provide valuable insights into their behavior.Key Features of Rapidly Varying FlowRVF is commonly observed in scenarios involving...
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RACE - Rapid Amplification of cDNA Ends02:35

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Rapid Amplification of cDNA Ends, or RACE, is one of the most effective methods to obtain a full-length cDNA from an mRNA sequence between a known internal region to the unknown sequence at the 5’ or 3’ end. The unknown region is cloned in the cDNA by a gene-specific primer that binds the known end, and a hybrid primer that attaches a predefined anchor sequence to the unknown end of the cDNA. The sequence in between is amplified by PCR with an anchor primer and a gene-specific...
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Plant tissue culture is widely used in both primary and applied science. Applications range from plant development studies to functional gene studies, crop improvement, commercial micropropagation, virus elimination, and conservation of rare species.
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Stem cells are undifferentiated cells that divide and produce more stem cells or progenitor cells that differentiate into mature, specialized cell types. All the cells in the body are generated from stem cells in the early embryo, but small populations of stem cells are also present in many adult tissues including the bone marrow, brain, skin, and gut. These adult stem cells typically produce the various cell types found in that tissue—to replace cells that are damaged or to continuously...
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相关实验视频

Updated: Jan 30, 2026

Optogenetic Functional MRI
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Optogenetic Functional MRI

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快速雷射核磁共振成像

Sören Lehmkuhl1, Simon Fleischer1, Jing Yang1

  • 1Institute of Microstructure Technology, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, 76344, Karlsruhe, Germany.

Angewandte Chemie (International ed. in English)
|January 29, 2026
PubMed
概括
此摘要是机器生成的。

研究人员通过激发发射辐射 (RASER) 进行了快速磁共振成像 (MRI),没有高功率的射频脉冲. 这种新的技术可以实现更快,更安全的MRI扫描,非常适合便携式和超极化成像应用.

关键词:
过极化的超极化这就是为什么MRI是MRI.核磁共振光谱法 (NMR) 是一种光谱法.准气为一种气.拉塞尔是一个皮者.

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科学领域:

  • 磁共振成像是一种磁共振成像技术.
  • 生物物理学的生物物理.
  • 医学物理 医学物理

背景情况:

  • 传统的MRI使用高功率射频 (RF) 脉冲来激发核旋转,导致组织加热,需要大型放大器.
  • 增加MRI场强度加剧了安全问题和设备需求.
  • 另一种选择,通过激发辐射发射 (RASER) 进行射频放大自刺激,绕过射频脉冲.

研究的目的:

  • 为了证明基于RASER的MRI用于快速成像的可行性.
  • 评估RASERMRI在高场强度和低度的性能.
  • 探索RASER MRI在动态成像和便携式应用中的潜力.

主要方法:

  • 在500 MHz (11.7 T) 的pyrazine溶液上进行了Proton RASER MRI.
  • 图像参数包括128x128矩阵大小,实现采集时间低至78 ms.
  • 时间序列成像采用单个高极化pyrazine的玻尿酸进行.

主要成果:

  • 快速质子RASERMRI图像的pyrazine (120mM) 已成功获得与一个128x128矩阵在78 ms.
  • 这项研究证明了超极化pyrazine的动态跟踪能力.
  • 这种方法消除了对发送接收MRI扫描仪电子的需求.

结论:

  • RASER MRI为传统的射频脉冲激发提供了一个可行的替代方案,使得MRI更快,更安全.
  • 这种技术非常适合便携式MRI系统.
  • 激光核磁共振是有前途的高级应用程序,如使用各种标记器的超极化核磁共振.