PROBLEM TO BE SOLVED: To provide an MRI system which can effectively prevent the generation of an unintended fake image due to an addition of prepulse, independently of imaging conditions.SOLUTION: The system has an irradiation means which generates a high-frequency magnetic field to be exposed to a subject in a static magnetic field, a receiving means which receives echo signals from the subject, a measurement control means which controls the irradiation means and the receiving means based on a given pulse sequence, wherein the pulse sequence consists of a prepulse part having prepulse and a main measurement part measuring the echo signals, and the measurement control means characteristically changes irradiation phases of prepulse for each irradiation.COPYRIGHT: (C)2009,JPO&INPIT【課題】撮像条件によらずに、プリパルス追加に基づく意図しない偽像の発生を効果的に抑制することが可能なMRI装置を提供する。【解決手段】静磁場中に置かれた被検体に照射する高周波磁場を発生する照射手段と、被検体からのエコー信号を受信する受信手段と、所定のパルスシーケンスに基づいて照射手段と受信手段を制御する計測制御手段と、を有し、パルスシーケンスは、プリパルスを有するプリパルス部と前記エコー信号の計測を行う主計側部とを有して成り、計測制御手段は、プリパルスの照射位相を照射毎に異ならせることを特徴とする。【選択図】 図3
