EP0129356A2
Expired / Lapsed
EP
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Nuclear magnetic resonance method and apparatus
Assignee: Philips Design Ltd
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Filing: 1984-06-01
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Granted: —
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Expires: 2004-06-01
Abstract
Abstract A NMR imaging method and apparatus effective to cause spins of a chosen nucleus within a body to rotate through an angle of 180 DEG wherein degradation of the image due to non-uniformity of the r.f. coil (9) is reduced. The method includes applying an even number of r.f. magnetic field pulses (B2, B4) at the Larmor frequency for a chosen nucleus in the body and each intended to rotate the spins of these nuclei through 180 DEG , half of the number of pulses having a phase difference of 180 DEG with respect to the other half of the number of pulses. NMR signals from the body are measured after each pulse, and the signals are averaged.
Inventors
- 👤 David Robert Bailes
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 11:34
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/20; G01R33/44; G01R33/48; G01R33/54; G01R33/56; G01R33/565; G01R33/5659
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
134 words
A method of investigating the spatial distribution of a quantity relating to nuclear magnetic resonance in a body in which the spins of the chosen nucleus in the body are rotated through 180°, and the nuclear magnetic resonance signal from said body measured after said rotation characterised in that: an even number of r.f. magnetic field pulses (B 2 , B 4 ) are applied, each at the Larmor frequency for said nucleus and each intended to rotate the spins of said nuclei through substantially 180°, half (B 2 ) of said number of pulses have a phase difference of substantially 180° with respect to the other half (B 4 ) of said number of pulses; nuclear magnetic resonance signals from said body after each of said pulses are measured;and said signals are averaged.
Claim 2
Independent Claim
134 words
A method of investigating the spatial distribution of a quantity relating to nuclear magnetic resonance in a body in which the spins of the chosen nucleus in the body are rotated through 180°, and the nuclear magnetic resonance signal from said body measured after said rotation characterised in that: an even number of r.f. magnetic field pulses (B 2 , B 4 ) are applied, each at the Larmor frequency for said nucleus and each intended to rotate the spins of said nuclei through substantially 180°, half (B 2 ) of said number of pulses have a phase difference of substantially 180° with respect to the other half (B 4 ) of said number of pulses; nuclear magnetic resonance signals from said body after each of said pulses are measured;and said signals are averaged.
Claim 3
Dependent Claim
28 words
A method according to Claim 1 in which each of said pulses (B 2 , B 4 ) is applied in the presence of a gradient magnetic field.
Claim 4
Independent Claim
116 words
An apparatus for investigating the spatial distribution of a quantity relating to nuclear magnetic resonance in a body characterised in that it includes: means (9) arranged to apply an even number of r.f. magnetic field pulses (B 2 , B 4 ) each at the Larmor frequency for a chosen nucleus in the body and each intended to rotate the spins of said nuclei through substantially 180°, half of said number of pulses having a phase difference of substantially 180 0 with respect to the other half of said number of pulses, means (9) arranged to measure nuclear magnetic resonance signals from said body after each of said pulses;and means (37) arranged to average said signals.
Claim 5
Independent Claim
116 words
An apparatus for investigating the spatial distribution of a quantity relating to nuclear magnetic resonance in a body characterised in that it includes: means (9) arranged to apply an even number of r.f. magnetic field pulses (B 2 , B 4 ) each at the Larmor frequency for a chosen nucleus in the body and each intended to rotate the spins of said nuclei through substantially 180°, half of said number of pulses having a phase difference of substantially 180 0 with respect to the other half of said number of pulses, means (9) arranged to measure nuclear magnetic resonance signals from said body after each of said pulses;and means (37) arranged to average said signals.
Claim 6
Dependent Claim
20 words
An apparatus according to Claim 3 including means(7) arranged to apply a gradient magnetic field during each of said pulses.
References Cited (Backward Citations)
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