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:
Mar. 19, 2013
Filed:
Dec. 20, 2006
Satoshi Hirata, Kodaira, JP;
Hisaaki Ochi, Kodaira, JP;
Satoshi Hirata, Kodaira, JP;
Hisaaki Ochi, Kodaira, JP;
Hitachi Medical Corporation, Tokyo, JP;
Abstract
Magnetic resonance imaging apparatus enabling highly precise spectrum measurement even when resonance frequency changes during MRS or MRSI measurement. When a pulse sequence for suppressing water signals, and an MRS or MRSI pulse sequence are sequentially executed to carry out measurement using repetitive measurement for signal integration or repetitive measurement for phase encoding, signal Sigfrom water is measured with the pulse sequence for suppressing water signals in every repetitive measurement. When the resonance frequency of water deviates from an excitation band region, nuclear magnetization included in water molecules is not excited, so that water signal strength deceases, and therefore change of static magnetic field intensity can be detected by monitoring change of signal Sig.When water signal strength decreases below a predetermined value, it is determined that resonance frequency has shifted, preliminary measurement for detecting water resonance frequency is performed, and various frequencies are corrected during the repetitive measurement.