MAGNETIC RESONANCE IMAGING DEVICE AND VIBRATIONAL ERROR MAGNETIC FIELD-REDUCING METHOD

摘要

In order to reduce, irrespective of measurement conditions, the deterioration of image quality arising from vibrational error magnetic fields generated by vibration of the mechanical structures of MRI devices, error magnetic field image data representing the error magnetic field distribution is acquired on the basis of echo signals measured using pulse sequences having a test gradient magnetic field. Using the error magnetic field image data, parameter values for a damped vibration function representing the vibrational error magnetic field are calculated and a correcting magnetic field is calculated on the basis of the parameter values for the damped vibration function representing the calculated vibrational error magnetic field.