Patent ID: 7187171

Claim:
A magnetic resonance imaging apparatus for imaging using a high-speed spin echo method, the apparatus including a gradient magnetic field coil which generates a gradient magnetic field for readout upon receiving a readout pulse, and a supply unit which supplies the readout pulse to the gradient magnetic field coil, comprising: a collection unit configured to collect, before actual scanning for collecting data used for imaging, a first spin echo, a second spin echo, and one of a third echo and a fourth echo occurring after the first and second spin echoes, each of the first and third spin echoes being an n th (n is a positive odd number) spin echo, each of the second and fourth spin echoes being an m th (m is a positive even number) spin echo; a first control unit configured to control the supply unit to supply the gradient magnetic field coil with a base pulse as the readout pulse during a period of collecting by the collection unit, spin echoes including the first to fourth spin echoes, and to further supply the gradient magnetic field coil with a unit pulse as the readout pulse during a period ranging from an end of a period of collecting a spin echo, which is included in the spin echoes and occurs immediately before one of the third and fourth spin echoes, to a start of a period of collecting one of the third and fourth spin echoes; a first measurement unit configured to measure an amount of deviation of a peak position of the second spin echo from a peak position of the first spin echo; a second measurement unit configured to measure an amount of shift of a peak position of the third spin echo from the peak position of the first spin echo, or an amount of shift of a peak position of the fourth spin echo from the peak position of the second spin echo; a determination unit configured to determine an amount of correction energy, based on the amount of shift, an amount of energy of the unit pulse, and the amount of deviation; and a second control unit configured to control the supply unit to supply the gradient magnetic field coil with the base pulse as the readout pulse during the actual scanning, and to further supply the gradient magnetic field coil with a correction pulse of the determined amount of correction energy as the readout pulse during the actual scanning.