MAGNETIC RESONANCE IMAGING APPARATUS AND METHOD FOR CALCULATING PULSE SEQUENCE TO BE CARRIED ON MAGNETIC RESONANCE IMAGING APPARATUS

摘要

When imaging is performed by executing a pulse sequence on an MRI apparatus, silencing is realized with securing sufficient application amount of crusher without extending the application time thereof. In the pulse sequence carried by the MRI apparatus, at least one gradient magnetic field pulse included in the pulse sequence has a waveform synthesized from two or more base waves shifting along the time axis direction (synthesized waveform), and the base waves have a smoothly changing waveform convex upward. The pulse of the synthesized waveform is generated from one or more trapezoidal or triangular base pulses by a waveform conversion part of a computer of the MRI apparatus or an external computer.

主权项

1. A magnetic resonance imaging apparatus comprising a static magnetic field magnet that generates a static magnetic field, a gradient coil that generates a gradient magnetic field in the static magnetic field generated by the static magnetic field magnet, a radio frequency coil that generates a radio frequency magnetic field and detects a magnetic resonance signal, and a control part that drives the gradient coil and the radio frequency coil according to a predetermined pulse sequence, wherein:
at least one gradient magnetic field pulse included in the pulse sequence is a pulse having a waveform synthesized from two or more base waves shifting along the time axis direction (synthesized waveform), and the base waves have a smoothly changing waveform convex upward.