Patent ID: 9588206
Date: 2017-03-07
CPC Classifications: A61B,G01R

Claim:
1. A magnetic resonance imaging apparatus comprising: a magnet which generates a static magnetic field; a gradient magnetic field generating unit configured to apply a gradient magnetic field in a static magnetic field space; a high-frequency magnetic field applying unit configured to apply a high-frequency magnetic field to an object to be examined; a signal detecting unit configured to detect a nuclear magnetic resonance signal generated from the object; a measurement control unit configured to control operation of the gradient magnetic field generating unit, the high-frequency magnetic field applying unit and the signal detecting unit; and a calculation unit configured to issue a command to the measurement control unit to control in accordance with a predetermined pulse sequence and perform calculation including reconstruction of an image from nuclear magnetic resonance signals detected by the signal detecting unit, wherein the calculation unit comprises: a high-frequency magnetic field determining unit configured to determine high-frequency magnetic field information to be applied from the high-frequency magnetic field applying unit on the basis of an output gradient magnetic field waveform which is applied by the gradient magnetic field generating unit in accordance with an input gradient magnetic field waveform which is input according to the pulse sequence; and a sequence creating unit configured to set high-frequency magnetic field information determined by the high-frequency magnetic field determining unit in the pulse sequence, and wherein the calculation unit is configured to calculate a correction amount in a frequency of the high-frequency magnetic field and a correction amount in a phase of the high-frequency magnetic field, and determines the high-frequency magnetic field information to be set in the pulse sequence by correcting the frequency and phase of a preset high-frequency magnetic field using the correction amounts.