Magnetic resonance imaging apparatus and method for correcting the intensity of the static magnetic field of the apparatus

An MRI apparatus has a plurality of shim coils 102 and gradient magnetic field coils 104, which are connected to power sources 103 and 105 respectively. These power sources are controlled by a computer 112 to correct intensity of a static magnetic field generated by a magnet. For this purpose, the p...

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Bibliographic Details
Main Author TSUDA; MUNETAKA
Format Patent
LanguageEnglish
Published 02.03.1999
Edition6
Subjects
DIAGNOSIS
HUMAN NECESSITIES
HYGIENE
IDENTIFICATION
MEASURING
MEASURING ELECTRIC VARIABLES
MEASURING MAGNETIC VARIABLES
MEDICAL OR VETERINARY SCIENCE
PHYSICS
SURGERY
TESTING
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Summary:An MRI apparatus has a plurality of shim coils 102 and gradient magnetic field coils 104, which are connected to power sources 103 and 105 respectively. These power sources are controlled by a computer 112 to correct intensity of a static magnetic field generated by a magnet. For this purpose, the power sources 103 and 105 supply composite current of DC and AC so that the shim coils and the gradient magnetic field coils generate a rotating magnetic field. As a result, the uniformity of the static magnetic field in a region of an object under examination is improved and image distortion is suppressed. The MRI apparatus can be effectively applied to a fast imaging technique, an imaging technique where NMR signals of adipose tissue are suppressed, and a high resolution spectrum.
Bibliography:Application Number: US19970829523