GB1081514A - Gyromagnetic resonance apparatus - Google Patents

Gyromagnetic resonance apparatus

Info

Publication number
GB1081514A
GB1081514A GB20116/65A GB2011665A GB1081514A GB 1081514 A GB1081514 A GB 1081514A GB 20116/65 A GB20116/65 A GB 20116/65A GB 2011665 A GB2011665 A GB 2011665A GB 1081514 A GB1081514 A GB 1081514A
Authority
GB
United Kingdom
Prior art keywords
phase detector
field
control
output
generator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB20116/65A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Varian Medical Systems Inc
Original Assignee
Varian Associates Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Varian Associates Inc filed Critical Varian Associates Inc
Publication of GB1081514A publication Critical patent/GB1081514A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
    • G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
    • G01R33/38—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
    • G01R33/381—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using electromagnets
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
    • G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
    • G01R33/38—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
    • G01R33/387—Compensation of inhomogeneities
    • G01R33/3875—Compensation of inhomogeneities using correction coil assemblies, e.g. active shimming
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
    • G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
    • G01R33/38—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
    • G01R33/389—Field stabilisation, e.g. by field measurements and control means or indirectly by current stabilisation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
    • G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
    • G01R33/46—NMR spectroscopy

Landscapes

  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

1,081,514. Electro-physical measurements. VARIAN ASSOCIATES. May 12, 1965 [June 4, 1964], No. 20116/65. Heading G1N. The invention relates to automatic homogenity control in a gyromagnetic spectrometer having a probe 10 containing the unknown sample and a reference material (e.g. 1% tetramethyl silane), excited by an R. F. generator 14 to produce a spectral signal which is fed to a phase detector 18 providing audio output. Correcting Field Drift This output is passed to A. F. phase detectors 24, 36 and compared with phase controlled signals from A. F. generators 26, 34 operating at e. g. 2 kc/s and 3 kc/s to provide absorption and dispersion peaks. In operation the dispersion signal is used to control the field/frequency ratio if the polarizing field or frequency of the R. F. generator drifts causing the operating point to move from the zero position as illustrated in Fig. 2 (not shown). Optimizing Field A further A. F. phase detector 42 is set to operate in the absorption mode, and its output is compared in an L. F. phase detector 48 with a signal from an L. F. generator which tends to modulate the supply to the shim coils 40 causing periodic changes in field gradient at the probe which periodically broadens the absorption peak from shape A to shape B Fig. 3 (not shown). The resultant output from the phase detector 42 and hence L. F. phase detector 48 operates the current control 52 to produce resonance lines having the greatest amplitude. Modifications. Fig. 5 (not shown) separate current controls may be used for each pair of shim coils. Fig. 7 (not shown) the control may be applied by a "sequencer" alternately to the shim coils and the "curvature coils" 80.
GB20116/65A 1964-06-04 1965-05-12 Gyromagnetic resonance apparatus Expired GB1081514A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US37262664A 1964-06-04 1964-06-04

Publications (1)

Publication Number Publication Date
GB1081514A true GB1081514A (en) 1967-08-31

Family

ID=23468972

Family Applications (1)

Application Number Title Priority Date Filing Date
GB20116/65A Expired GB1081514A (en) 1964-06-04 1965-05-12 Gyromagnetic resonance apparatus

Country Status (5)

Country Link
CH (1) CH466611A (en)
DE (1) DE1673187C3 (en)
FR (1) FR1444078A (en)
GB (1) GB1081514A (en)
NL (1) NL6506391A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2915076A1 (en) * 1978-04-14 1979-10-25 Varian Associates METHOD FOR STABILIZING THE GYROMAGNETIC RATIO IN AN NMR SPECTROMETER AND A SUITABLE PULSE SPECTROMETER
DE3842104A1 (en) * 1987-12-14 1989-06-22 Toshiba Kawasaki Kk METHOD AND DEVICE FOR IMAGING CORE MAGNETIC RESONANCE

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0522191B1 (en) * 1991-07-11 1996-06-26 Spectrospin Ag Method and apparatus for compensating field disturbances in magnetic fields

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2915076A1 (en) * 1978-04-14 1979-10-25 Varian Associates METHOD FOR STABILIZING THE GYROMAGNETIC RATIO IN AN NMR SPECTROMETER AND A SUITABLE PULSE SPECTROMETER
DE3842104A1 (en) * 1987-12-14 1989-06-22 Toshiba Kawasaki Kk METHOD AND DEVICE FOR IMAGING CORE MAGNETIC RESONANCE

Also Published As

Publication number Publication date
FR1444078A (en) 1966-07-01
DE1673187B2 (en) 1973-05-17
DE1673187A1 (en) 1970-08-06
NL6506391A (en) 1965-12-06
CH466611A (en) 1968-12-15
DE1673187C3 (en) 1973-12-13

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