公开(公告)号：US20180330863A1

公开(公告)日：2018-11-15

申请号：US15966904

申请日：2018-04-30

Applicant: Korea Research Institute of Standards and Science

Inventor： Seong-min Hwang ,  Jeong-Hyun Shim ,  Ingo Hilschenz ,  Seong-Joo Lee ,  Kiwoong Kim

IPC: H01F27/10 ,  H01F7/06 ,  H01F27/22

CPC classification number: H01F27/10 ,  H01F7/06 ,  H01F27/22

Abstract: An electromagnet includes insulating cooling plates of a ceramic material which are vertically arranged parallel to each other, washer-shaped insulating center spacers maintained at a constant distance between adjacent insulating cooling plates, pancake coils including Litz wires which are spirally wound on each of the insulating center spacers in the space between the adjacent insulating cooling plates, and a housing which covers at least outer side surfaces of the insulating cooling plates and the pancake coils and provides a coolant to cool the insulating cooling plates.

公开(公告)号：US11064900B2

公开(公告)日：2021-07-20

申请号：US16085488

申请日：2017-04-03

Applicant: KOREA RESEARCH INSTITUTE OF STANDARDS AND SCIENCE

Inventor： Seong-Joo Lee ,  Kiwoong Kim ,  Jeong-Hyun Shim ,  Kwon-Kyu Yu ,  Seong-min Hwang

IPC: A61B5/055 ,  G01R33/48 ,  G01R33/381 ,  G01R33/32 ,  G01R33/56 ,  A61B5/00 ,  G01R33/24 ,  G01R33/44 ,  G01R33/421

Abstract: Provided are an ultra-low field nuclear magnetic resonance device and a method for measuring an ultra-low field nuclear resonance image. The ultra-low field nuclear magnetic resonance device includes an AC power supply configured to supply a current to a measurement target in such a manner the current flows to the measurement target, magnetic field measurement means disposed adjacent to the measurement target, and measurement bias magnetic field generation means configured to apply a measurement bias magnetic field corresponding to a proton magnetic resonance frequency of the measurement target. A vibration frequency of the AC power supply matches the proton magnetic resonance frequency of the measurement target, and the magnetic field measurement means measures a nuclear magnetic resonance signal generated from the measurement target.

公开(公告)号：US09903927B2

公开(公告)日：2018-02-27

申请号：US13909564

申请日：2013-06-04

Applicant: KOREA RESEARCH INSTITUTE OF STANDARDS AND SCIENCE

Inventor： Seong-min Hwang ,  Kiwoong Kim ,  Jin Mok Kim ,  Yong-Ho Lee ,  Chan Seok Kang ,  Kwon Kyu Yu ,  Seong-Joo Lee

IPC: G01V3/00 ,  G01R33/421 ,  A61B5/00 ,  A61B5/055 ,  G01R33/44

CPC classification number: G01R33/421 ,  A61B5/0046 ,  A61B5/055 ,  G01R33/445

Abstract: Provided are an apparatus and a method for canceling magnetic fields. The apparatus includes a magnetic field canceling coil disposed adjacent to an inner wall of a magnetic shield room to surround the entire inner space or a portion of an inner space of the magnetic shield room; and a magnetic field canceling coil driver to supply current to the magnetic field canceling coil. The magnetic field canceling coil cancels a prepolarization magnetic field established on the wall of the magnetic shield room by a prepolarization coil disposed in the center of the magnetic shield room to minimize magnetic interference caused by the magnetic shield room.

公开(公告)号：US10162028B2

公开(公告)日：2018-12-25

申请号：US14618535

申请日：2015-02-10

Applicant: Korea Research Institute of Standards and Science

Inventor： Seong-min Hwang ,  Kiwoong Kim ,  Kwon-Kyu Yu ,  Seong-Joo Lee ,  Jeong-Hyun Shim

IPC: G01R33/44 ,  G01R33/3815 ,  G01R33/32 ,  G01R33/34

Abstract: Provided is a low magnetic field and ultra-low magnetic field NMR and MRI apparatus. The low magnetic field and ultra-low magnetic field NMR and MRI apparatus includes a SQUID sensor and a prepolarization magnetic field coil. The prepolarization magnetic field coil generates a prepolarization magnetic field to polarize a sample. The prepolarization magnetic coil generates a counter pulse in a direction opposite to that of the prepolarization magnetic field immediately before or immediately after the prepolarization magnetic field is generated. The counter pulse demagnetizes wanted magnetization including that of the prepolarization magnetic field coil itself.

公开(公告)号：US20160209482A1

公开(公告)日：2016-07-21

申请号：US14618535

申请日：2015-02-10

Applicant: Korea Research Institute of Standards and Science

Inventor： Seong-min Hwang ,  Kiwoong Kim ,  Kwon-Kyu Yu ,  Seong-Joo Lee ,  Jeong-Hyun Shim

IPC: G01R33/44 ,  G01R33/3815 ,  G01R33/32

CPC classification number: G01R33/445 ,  G01R33/326 ,  G01R33/34023 ,  G01R33/3815

Abstract: Provided is a low magnetic field and ultra-low magnetic field NMR and MRI apparatus. The low magnetic field and ultra-low magnetic field NMR and MRI apparatus includes a SQUID sensor and a prepolarization magnetic field coil. The prepolarization magnetic field coil generates a prepolarization magnetic field to polarize a sample. The prepolarization magnetic coil generates a counter pulse in a direction opposite to that of the prepolarization magnetic field immediately before or immediately after the prepolarization magnetic field is generated. The counter pulse demagnetizes wanted magnetization including that of the prepolarization magnetic field coil itself.

Abstract translation: 提供了低磁场和超低磁场NMR和MRI装置。 低磁场和超低磁场NMR和MRI装置包括SQUID传感器和预极化磁场线圈。 预极化磁场线圈产生极化磁极以使样品极化。 前极化磁线圈在产生前极化磁场之前或之后产生与反极化磁场相反方向的计数脉冲。 计数脉冲使包括预极化磁场线圈本身的所需磁化消磁。

公开(公告)号：US09903925B2

公开(公告)日：2018-02-27

申请号：US13921724

申请日：2013-06-19

Applicant: Korea Research Institute of Standards and Science

Inventor： Ki Woong Kim ,  Seong-Joo Lee ,  Chan Seok Kang ,  Seong-min Hwang ,  Yong-Ho Lee

IPC: G01V3/00 ,  G01R33/36 ,  G01R33/28 ,  G01R33/44 ,  G01R33/62 ,  G01R33/30 ,  G01R33/32 ,  G01R33/48

CPC classification number: G01R33/36 ,  G01R33/282 ,  G01R33/307 ,  G01R33/326 ,  G01R33/3607 ,  G01R33/445 ,  G01R33/4826 ,  G01R33/62

Abstract: Provided are a low-field nuclear magnetic resonance device and a low-field nuclear magnetic resonance method. The low-field nuclear magnetic resonance device includes a dynamic nuclear polarization (DNP) amplification unit to amplify the nuclear polarization of hydrogen atoms of water using a DNP-possible substance (DNP substance) to provide the amplified nuclear polarization to a measurement target, a sensor unit to measure a magnetic resonance signal of the measurement target using a SQUID sensor or an optically-pumped atomic magnetometer, and a measurement field coil to apply a measurement field to the measurement target. The DNP amplification unit is separated from the measurement target, the sensor unit, and the measurement field coil.