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1. (US5254949) Nuclear magnetic resonance imaging methods

Office : United States of America
Application Number: 07781206 Application Date: 11.12.1991
Publication Number: 5254949 Publication Date: 19.10.1993
Grant Number: 5254949 Grant Date: 19.10.1993
Publication Kind : A
Prior PCT appl.: Application Number:GB90000967 ; Publication Number: Click to see the data
IPC:
G01R 33/20
A61B 5/055
G01N 24/00
G01N 24/08
G01R 33/44
G01R 33/46
G01R 33/48
G01R 33/54
G PHYSICS
01
MEASURING; TESTING
R
MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
33
Arrangements or instruments for measuring magnetic variables
20
involving magnetic resonance
A HUMAN NECESSITIES
61
MEDICAL OR VETERINARY SCIENCE; HYGIENE
B
DIAGNOSIS; SURGERY; IDENTIFICATION
5
Measuring for diagnostic purposes; Identification of persons
05
Measuring for diagnosis by means of electric currents or magnetic fields
055
involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
G PHYSICS
01
MEASURING; TESTING
N
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
24
Investigating or analysing materials by the use of nuclear magnetic resonance, electron paramagnetic resonance or other spin effects
G PHYSICS
01
MEASURING; TESTING
N
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
24
Investigating or analysing materials by the use of nuclear magnetic resonance, electron paramagnetic resonance or other spin effects
08
by using nuclear magnetic resonance
G PHYSICS
01
MEASURING; TESTING
R
MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
33
Arrangements or instruments for measuring magnetic variables
20
involving magnetic resonance
44
using nuclear magnetic resonance (NMR)
G PHYSICS
01
MEASURING; TESTING
R
MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
33
Arrangements or instruments for measuring magnetic variables
20
involving magnetic resonance
44
using nuclear magnetic resonance (NMR)
46
NMR spectroscopy
G PHYSICS
01
MEASURING; TESTING
R
MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
33
Arrangements or instruments for measuring magnetic variables
20
involving magnetic resonance
44
using nuclear magnetic resonance (NMR)
48
NMR imaging systems
G PHYSICS
01
MEASURING; TESTING
R
MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
33
Arrangements or instruments for measuring magnetic variables
20
involving magnetic resonance
44
using nuclear magnetic resonance (NMR)
48
NMR imaging systems
54
Signal processing systems, e.g. using pulse sequences
Applicants: British Technology Group Ltd.
Inventors: McDonald Peter J.
Tokarczuk Pawel F.
Agents: Cushman, Darby & Cushman
Priority Data: 8914467 23.06.1989 GB
Title: (EN) Nuclear magnetic resonance imaging methods
Abstract: front page image
(EN)

To derive NMR imaging information an object is subjected to a static magnetic field on which is superimposed a sinusoidally time varying magnetic gradient field. A sequence of narrow 90.degree. rf pulses are applied around the instants when the gradient field has a zero value. The rf pulses have relative phase quadrature such that excited nuclei precess with accumulated phase in each sequence.


Also published as:
EP0478632DE000069030002GB2234594WO/1991/000529