MAGNETIC RESONANCE IMAGING DEVICE AND METHOD FOR MEASURING IRRADIATION MAGNETIC FIELD

摘要

In order to provide an MRI device capable of measuring the B1 distribution of an RF transmission coil in a short time and with high precision, an imaging means of an MRI device is provided with a B1 distribution measurement sequence which includes application of a pre-pulse by an RF radiation means, and a plurality of signal acquisition sequences in which the elapsed time (TI) from application of the pre-pulse varies. The signal acquisition sequences each use RF pulses having a small flip angle, and are executed before the end of longitudinal relaxation after the pre-pulse. A computation means computes the B1 distribution of the RF radiation means using image data having different TI values obtained by the plurality of signal acquisition sequences.