Title:
MAGNETIC RESONANCE MEASUREMENT DEVICE
Document Type and Number:
WIPO Patent Application WO/2020/054686
Kind Code:
A1
Abstract:
This magnetic resonance measurement device has a first LC circuit for forming an oscillating magnetic field in which an object causes magnetic resonance, the first LC circuit has a parallel connector including a diode, and the parallel connector further includes a diode connected in parallel in the opposite direction to the diode, or an inductor connected in parallel to the diode. In a first state in which an oscillating voltage for forming an oscillating magnetic field is applied to the first LC circuit, the diode of the parallel connector is short-circuited, and the resonance frequency of the first LC circuit thereby becomes a first resonance frequency. In a second state in which an oscillating voltage is not applied to the first LC circuit, the diode of the parallel connector functions as a capacitance, and the resonance frequency of the first LC circuit thereby becomes a second resonance frequency different from the first resonance frequency.
Inventors:
TAKAHASHI MASATO (JP)
Application Number:
PCT/JP2019/035446
Publication Date:
March 19, 2020
Filing Date:
September 10, 2019
Export Citation:
Assignee:
RIKEN (JP)
International Classes:
G01N24/00; A61B5/055; G01N24/08
Foreign References:
| JPH06142076A | 1994-05-24 | |||
| JPS63117745A | 1988-05-21 | |||
| JP2007322361A | 2007-12-13 | |||
| JPH0584228A | 1993-04-06 | |||
| JPH02261428A | 1990-10-24 | |||
| US4620155A | 1986-10-28 | |||
| US4725779A | 1988-02-16 | |||
| US5221902A | 1993-06-22 | |||
| US6956370B2 | 2005-10-18 | |||
| US20060119357A1 | 2006-06-08 | |||
| US7388377B2 | 2008-06-17 | |||
| US7710116B2 | 2010-05-04 |
Other References:
M. ROBIN BENDALLALAN CONNELLYJAMIE M. MCKENDRY: "Elimination of Coupling between Cylindrical Transmit Coils and Surface-Receive Coils for in Vivo NMR", MAGNETIC RESONANCE IN MEDICINE, vol. 3, 1986, pages 157 - 163, XP002377116
A.S. PESHKOVSKYJ. FORGUEZL. CERIONID.J. PUSIOL: "RF probe recovery time reduction with a novel active ringing suppression circuit", JOURNAL OF MAGNETIC RESONANCE, vol. 177, 2005, pages 67 - 73
HUI DONGYI ZHANGHANS-JOACHIM KRAUSEXIAOMING XIEALEX I BRAGINSKIANDREAS OFFENHAUSSER: "Suppression of ringing in the tuned input circuit of a SQUID detector used in low-field NMR measurements", SUPERCOND. SCI. TECHNOL., vol. 22, 2009, pages 125022, XP020167937
DAVID 0. BRUNNERLUKAS FURRERMARKUS WEIGERWERNER BAUMBERGERTHOMAS SCHMIDJONAS REBERBENJAMIN E. DIETRICHBERTRAM J. WILMROMAIN FROIDE: "Symmetrically biased T/R switches for NMR and MRI with microsecond dead time", JOURNAL OF MAGNETIC RESONANCE, vol. 263, 2016, pages 147 - 155, XP029409186, DOI: 10.1016/j.jmr.2015.12.016
See also references of EP 3851839A4
A.S. PESHKOVSKYJ. FORGUEZL. CERIONID.J. PUSIOL: "RF probe recovery time reduction with a novel active ringing suppression circuit", JOURNAL OF MAGNETIC RESONANCE, vol. 177, 2005, pages 67 - 73
HUI DONGYI ZHANGHANS-JOACHIM KRAUSEXIAOMING XIEALEX I BRAGINSKIANDREAS OFFENHAUSSER: "Suppression of ringing in the tuned input circuit of a SQUID detector used in low-field NMR measurements", SUPERCOND. SCI. TECHNOL., vol. 22, 2009, pages 125022, XP020167937
DAVID 0. BRUNNERLUKAS FURRERMARKUS WEIGERWERNER BAUMBERGERTHOMAS SCHMIDJONAS REBERBENJAMIN E. DIETRICHBERTRAM J. WILMROMAIN FROIDE: "Symmetrically biased T/R switches for NMR and MRI with microsecond dead time", JOURNAL OF MAGNETIC RESONANCE, vol. 263, 2016, pages 147 - 155, XP029409186, DOI: 10.1016/j.jmr.2015.12.016
See also references of EP 3851839A4
Attorney, Agent or Firm:
IP FIRM SHUWA (JP)
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