Method and apparatus for MR imaging without a flashing phenomenon of an object having periodical motion

摘要

In an MR imaging method, at least radio frequency pulses for excitation are repetitiously consecutively applied in accordance with predetermined pulse sequences until measurement of NMR signals corresponding to phase encoding numbers necessary for desired image construction ends, an external trigger signal synchronous with periodical motion of an object to be inspected is received during the period of application, and a gradient magnetic field having a phase encoding amount necessary for the image construction is applied at the termination of a predetermined time following the reception of the trigger signal to fetch at least one NMR signal. When a plurality of NMR signals are desired to be fetched, a plurality of gradient magnetic fields having mutually different phase encoding amounts are applied. This process is repeated until measurement of NMR signals corresponding to phase encoding numbers necessary for desired image construction ends and an image at a desired phase of the periodical motion of the inspected object is constructed using the thus fetched NMR signals.