• 제목/요약/키워드: Magnetic resonance

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The Fornix: Functional Anatomy, Normal Neuroimaging, and Various Pathological Conditions

  • Choi, Young Jae;Lee, Eun Ja;Lee, Jung Eun
    • Investigative Magnetic Resonance Imaging
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    • 제25권2호
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    • pp.59-75
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    • 2021
  • The fornix is the major white-matter outflow tract from the hippocampus; it has a significant role in cognitive function. It is readily imaged via magnetic resonance imaging; its main parts are the crura, commissure, body, and columns. In this pictorial essay, we describe and illustrate the functional and imaging anatomy of the fornix and limbic system, as well as various disease entities involving the fornix.

동물에서 자기 공명 영상 진단의 물리적 원리 (Physical Principles of Magnetic Resonance Imaging in Animal)

  • 김종규
    • 한국임상수의학회지
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    • 제16권1호
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    • pp.75-79
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    • 1999
  • Magnetic resonance imaging (MRI) is an imaging technique used to produce high quality images of the inside of the animal body. MRI is based on the principles of nuclear magnetic resonance (NMR) and started out as a tomographic imaging technique, that is it produced an image of the NMR signal in a thin slice through the animal body. The animal body is primarily fat and water, Fat and water have many hydrogen atoms. Hydrogen nuclei have an NMR signal. For these reasons magnetic resonance imaging primarily images the NMR signal from the hydrogen nuclei. Hydrogen protons, within the body align with the magnetic field. By applying short radio frequency (RF) pulses to a specific anatomical slice, the protons in the slice absorb energy at this resonant frequency causing them to spin perpendicular to the magnetic field. As the protons relax back into alignment with the magnetic field, a signal is received by an RF coil that acts as an antennae. This signal is processed by a computer to produce diagnostic images of the anatomical area of interest.

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자기공진방식의 무선전력전송 시스템에서 공진 중계기 적용 여부에 따른 전력전송 효율 분석 (Analysis of the Efficiency According to Resonant Repeater Application in Magnetic Resonant Wireless Power Transfer System)

  • 백승명;김동은;손진근
    • 전기학회논문지P
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    • 제67권4호
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    • pp.221-226
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    • 2018
  • In this paper, the power transfer efficiency analysis based on the resonant repeater in a magnetic resonance wireless power transfer system is proposed. The efficiency of the magnetic resonance method was verified by comparing the general frequency with the resonance frequency. The resonance repeater was arranged to increase the efficiency and increase the transfer distance. When using resonant repeaters, the maximum efficiency increase is about 36.23[%] and the transfer distance was extended to more than 20[cm]. Through this study, confirmed the effect of using resonance repeaters in wireless power transfer system. As a result, it can be expected that the overall technology related to wireless power transfer system will be more valuable for energy-IT technology.

K-Space의 원리

  • 오창현;이성우
    • Investigative Magnetic Resonance Imaging
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    • 제3권1호
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    • pp.1-5
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    • 1999
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