Magnetic resonance imaging device, method for correcting measured-space coordinates, and image reconstruction method

To approximate the waveform shape of a gradient magnetic field pulse with good precision and to improve image quality even in a changing imaging cross-section or in oblique imaging, this MRI device divides the waveform shape of the gradient magnetic field pulse into a plurality of sections, defines an approximation function for each section, and uses an approximation function parameter to correct a spatial coordinate (k) for arranging an echo signal. The measured signal is used to search for the optimal parameter of an approximation function for the waveform shape of the gradient magnetic field pulse.