MAGNETIC RESONANCE IMAGING APPARATUS AND CONTROL DEVICE OF A MAGNETIC RESONANCE IMAGING APPARATUS

摘要

A control device of a magnetic resonance (MRI) imaging apparatus includes a condition setting unit and a judging unit. The condition setting unit sets an imaging sequence to be performed by the magnetic resonance imaging apparatus based on set conditions of the set imaging sequence. The judging unit then (a) calculates a value of electric current supplied to a gradient magnetic field coil of the MRI apparatus to perform that set imaging sequence based on the set conditions of the set imaging sequence, (b) calculates a value of voltage that would need to be applied to the gradient magnetic field coil based on a mutual inductance of the gradient magnetic field to cause electric current flowing to the gradient magnetic field coil to become equal to the value of the calculated electric current, and (c) judges whether the set imaging sequence is practicable or not based on the calculated value of voltage.

主权项

1. A magnetic resonance imaging apparatus that applies a gradient magnetic field to an imaging region, generates k-space data including a plurality of matrix elements by sampling a nuclear magnetic resonance signal acquired from the imaging region and reconstructs image data based on the k-space data, comprising:
a gradient magnetic field power supply configured to apply the gradient magnetic field to the imaging region by supplying gradient magnetic field current to a gradient magnetic field coil under an imaging sequence; a gradient magnetic field calculating unit configured to calculate a waveform of the gradient magnetic field current based on conditions of the imaging sequence, and calculate a waveform of a gradient magnetic field in a readout direction based on a mutual inductance by which the gradient magnetic field coil causes mutual induction and the waveform of the gradient magnetic field current; and a regridding processing unit configured to generate or rearrange the k-space data by sampling at unequally-spaced intervals, so that a part of the nuclear magnetic resonance signal acquired during a time span in which a time integral value of intensity of the gradient magnetic field in a readout direction is non-linear and each time integral value up to a sampling period corresponding to each of the matrix elements becomes equally-spaced.