Patent ID: 8400148
Filing Date: 2013-03-19
Classification: G01R

Abstract:
1. A magnetic resonance imaging apparatus comprising: a static magnetic field magnet which generates a static magnetic field, a magnetic field gradient generating means which generates a magnetic field gradient, a radio frequency magnetic field generating means which generates a radio frequency magnetic field, a receiving means which receives nuclear magnetic resonance signals generated by a subject, a control means which controls the magnetic field gradient generating means, the radio frequency magnetic field generating means and the receiving means, and a means which calculates a spectrum of an imaging region of the subject by using the nuclear magnetic resonance signals, wherein: the control means includes at least one first pulse sequence for applying a radio frequency magnetic field of a first frequency for suppressing magnetization of a specific substance contained in the imaging region, and a second pulse sequence for applying a radio frequency magnetic field of a second frequency following the first pulse sequence to obtain nuclear magnetic resonance signals from the imaging region, performs control for obtaining the nuclear magnetic resonance signals after application of the radio frequency magnetic field of the first frequency with the first pulse sequence, and the magnetic resonance imaging apparatus further comprising a determination means utilizing a water signal suppression pulse sequence for determining change of the first frequency by using information of the nuclear magnetic resonance signals obtained with the first pulse sequence, wherein the determination means determines that there is change when intensity of the nuclear magnetic resonance signals is lower than a preliminarily determined threshold value.