Patent ID: 7348779
Filing Date: 2008-03-25
Classification: G01R

Abstract:
1. A magnetic resonance imaging method comprising: (1) a step for applying one or more pulses of the gradient magnetic field sequentially and detecting nuclear magnetic resonance signals for reconstructing magnetic resonance images; (2) a step for calculating a residual magnetic field being generated in the magnetic device by the applied gradient magnetic field on the basis of the residual magnetic field response function that represents the relation between the strength of the applied gradient magnetic field and the strength of the residual magnetic field being generated by the applied gradient magnetic field; and (3) a step for correcting the residual magnetic field calculated in the step (2) along with the application of each pulse of the gradient magnetic field; (4) a step for updating the residual magnetic field response function in accordance with the strength of each pulse of the applied gradient magnetic field along with the application of the gradient magnetic field pulses, wherein the calculation in step (2) is executed to calculate the strength of the residual magnetic field upon every application of the gradient magnetic field pulse in the process of executing the imaging sequence, and the strength of the residual magnetic field calculated in step (2) is used to correct the residual magnetic field in step (3) which changes the strength in accordance with every application of the gradient magnetic field pulse in the process of executing the imaging sequence, and updating of the residual magnetic field response function in step (4) is executed upon every application of the gradient magnetic field pulse in the process of executing the imaging sequence, and the calculation of the residual magnetic field in step (2) is executed by using the residual magnetic field response function updated in step (4), and the residual magnetic field response function, which is used in step (2) and updated in step (4), is stored in a storage means and updated in real time and changes in accordance with every application of the gradient magnetic field pulse in the process of executing the imaging sequence.