GB1241843A - Spectrometer apparatus - Google Patents

Spectrometer apparatus

Info

Publication number
GB1241843A
GB1241843A GB3974268A GB3974268A GB1241843A GB 1241843 A GB1241843 A GB 1241843A GB 3974268 A GB3974268 A GB 3974268A GB 3974268 A GB3974268 A GB 3974268A GB 1241843 A GB1241843 A GB 1241843A
Authority
GB
United Kingdom
Prior art keywords
resonance
adjusted
give
maximum
spectrum
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
GB3974268A
Inventor
Richard R Ernst
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
Priority claimed from US661985A external-priority patent/US3873909A/en
Application filed by Varian Associates Inc filed Critical Varian Associates Inc
Publication of GB1241843A publication Critical patent/GB1241843A/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
    • G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
    • G01R33/46—NMR spectroscopy
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N24/00—Investigating or analyzing materials by the use of nuclear magnetic resonance, electron paramagnetic resonance or other spin effects
    • 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]
    • G01R33/48—NMR imaging systems
    • G01R33/58—Calibration of imaging systems, e.g. using test probes, Phantoms; Calibration objects or fiducial markers such as active or passive RF coils surrounding an MR active material
    • G01R33/583—Calibration of signal excitation or detection systems, e.g. for optimal RF excitation power or frequency

Abstract

1,241,843. Gyromagnetic resonance spectrometers. VARIAN ASSOCIATES. Aug.20, 1968 [Aug.21, 1967(2)], No.39742/68. Heading G1N. The operating parameters of a gyromagnetic resonance spectrometer 1 are automatically adjusted under the control of a computer 2 which stores in its memory the results of scanning a reference resonance line or whole spectrum for different settings of the operating parameters and derives correction signals which are applied to adjust the operating parameters of the spectrometer. Individual parameters are adjusted as follows:- Field homogeneity. The currents in field homogenizing coils 12, 13 are adjusted to give maximum resonance peak height or maximum area under resonance curve with forced or free precession with the spectrometer locked on to a given reference resonance line or with repetitive scanning of a reference resonance line or spectrum. If free precession is used, a "dephasing pulse" may be applied between successive resonance measurements. Alternatively, the adjustments may be made to give minimum width of peak or maximum peak-to-peak of first wiggle of resonance. Field Stability. The polarizing field is adjusted to give maximum correlation between successive spectra or to superimpose one spectrum on another or to give zero beat frequency between a free precession signal and the r.f. exciting signal or another stable frequency. Radio Frequency Phase. With the spectrometer locked on to a given reference line, the phase of the r.f. transmitter is adjusted so that with pulsed excitation the initial value of the dispersion mode signal is zero or the initial value of the absorption mode signal is a maximum. Alternatively, with repetitive scanning of a line or spectrum, the phase is adjusted to give maximum peak height, maximum peak area or maximum peak symmetry. Radio Frequency Intensity. The intensity of the r.f. transmitter is adjusted to give maximum peak height with repetitive scanning of the spectrum. Scanning Rate. The scanning speed may be slow when the resonance signal is above a given value and fast when the resonance signal is below the given value. Alternatively, correction signals may be derived from side-bands of a given reference line or the rate-of-change of a beat frequency between a strong free induction resonance and the r.f. signal. Filter time-constants. These are adjusted during repetitive scanning of a spectrum to give maximum peak height or twice the minimum peak width or to eliminate wiggles from a reference line. Sample Spinning Rate. This may be adjusted to give maximum energy of a resonance line under pulsed r.f.; or maximum peak height or area or peak-to-peak height of first wiggle during repetitive scanning. Double Resonance Transmitter. The frequency of the double resonance r.f. transmitter is adjusted to give maximum effect and its intensity is adjusted to give maximum peak height when locked on to a reference line.
GB3974268A 1967-08-21 1968-08-20 Spectrometer apparatus Expired GB1241843A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US66198667A 1967-08-21 1967-08-21
US661985A US3873909A (en) 1967-08-21 1967-08-21 Gyromagnetic apparatus employing computer means for correcting its operating parameters

Publications (1)

Publication Number Publication Date
GB1241843A true GB1241843A (en) 1971-08-04

Family

ID=27098434

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3974268A Expired GB1241843A (en) 1967-08-21 1968-08-20 Spectrometer apparatus

Country Status (4)

Country Link
JP (1) JPS5126829B1 (en)
DE (1) DE1798079C3 (en)
FR (1) FR1578451A (en)
GB (1) GB1241843A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2934966A1 (en) * 1979-08-29 1981-03-19 Southwest Research Institute, San Antonio, Tex. Enhanced NMR detection appts. for explosives - has transmitter and receiver connected to RF coil surrounding sample holder near magnet
EP0124108A2 (en) * 1983-04-30 1984-11-07 Kabushiki Kaisha Toshiba Correction circuit for a static magnetic field of an NMR apparatus and NMR apparatus for utilizing the same
GB2155642A (en) * 1984-03-09 1985-09-25 Mitsubishi Electric Corp Apparatus for generating highly homogeneous magnetic field
EP1586915A1 (en) * 2004-04-15 2005-10-19 Jeol Ltd. Method of quantifying a magnetic resonance spectrum

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3628161A1 (en) * 1986-08-20 1988-02-25 Spectrospin Ag DEVICE FOR COMPENSATING TIME VARIANTS FIELD FAULTS IN MAGNETIC FIELDS

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2934966A1 (en) * 1979-08-29 1981-03-19 Southwest Research Institute, San Antonio, Tex. Enhanced NMR detection appts. for explosives - has transmitter and receiver connected to RF coil surrounding sample holder near magnet
EP0124108A2 (en) * 1983-04-30 1984-11-07 Kabushiki Kaisha Toshiba Correction circuit for a static magnetic field of an NMR apparatus and NMR apparatus for utilizing the same
EP0124108A3 (en) * 1983-04-30 1986-03-19 Kabushiki Kaisha Toshiba Correction circuit for a static magnetic field of an nmr apparatus and nmr apparatus for utilizing the same
US4644473A (en) * 1983-04-30 1987-02-17 Kabushiki Kaisha Toshiba Correction circuit for a static magnetic field of an NMR apparatus and NMR apparatus for utilizing the same
GB2155642A (en) * 1984-03-09 1985-09-25 Mitsubishi Electric Corp Apparatus for generating highly homogeneous magnetic field
EP1586915A1 (en) * 2004-04-15 2005-10-19 Jeol Ltd. Method of quantifying a magnetic resonance spectrum

Also Published As

Publication number Publication date
DE1798079B2 (en) 1974-07-18
FR1578451A (en) 1969-08-14
JPS5126829B1 (en) 1976-08-09
DE1798079A1 (en) 1971-11-04
DE1798079C3 (en) 1975-03-06

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