| 摘要 |
<P>PROBLEM TO BE SOLVED: To calculate actual gradient magnetic field waveforms in MRI with a high precision, and to perform regridding processing with a high precision on the basis of the gradient magnetic field waveform. <P>SOLUTION: An MRI apparatus includes a gradient magnetic field calculating unit and a regridding processing unit. The gradient magnetic field calculating unit calculates a waveform of a gradient magnetic field current supplied to a gradient magnetic field coil on the basis of conditions of an imaging sequence and calculates the gradient magnetic field waveform in a readout direction on the basis of a mutual inductance by which the gradient magnetic field coil causes the mutual induction and the waveform of the gradient magnetic field current. The regridding processing unit generates or rearranges k-space data so that a part of a nuclear magnetic resonance signal acquired during a time zone in which a time integral value of an intensity of the gradient magnetic field in the readout direction is non-linear may undergo sampling, and the time integral value up to a sampling period corresponding to each matrix element in the k-space data may equally be spaced. <P>COPYRIGHT: (C)2013,JPO&INPIT |
