The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 08, 2008
Filed:
Jul. 20, 2005
Satoshi Hirata, Kodaira, JP;
Hisaaki Ochi, Kodaira, JP;
Satoshi Hirata, Kodaira, JP;
Hisaaki Ochi, Kodaira, JP;
Hitachi Medical Corporation, Tokyo, JP;
Abstract
Provided is a magnetic resonance imaging system capable of reducing degradation in a magnetic resonance spectrum derived from a change in a static magnetic field. A sequence controller performs non-water-suppressed spectrum measurement (pre-scan) cyclically during water-suppressed spectrum measurement (main scan) accompanied by repetitive measurement intended for averaging of signals, and cyclically detects a water resonant frequency (water-signal peak position) and a phase value at a water-signal peak from an obtained non-water-suppressed spectrum (the cyclic pre-scan makes it possible to sense a time-varying rate of static magnetic field strength (resonant frequency)). For the water-suppressed spectrum measurement (main scan) succeeding the pre-scan, a reception-initiating phase value that is used to detect a magnetic resonance signal is set to a value calculated using the phase value at the water-signal peak position detected during the pre-scan. For averaging of measured magnetic resonance signals, data items are shifted by the value calculated from the phase value at the water-signal peak position detected during the pre-scan. Thereafter, the averaging is carried out.