PROBLEM TO BE SOLVED: To provide an MRI device capable of continuously radiating a selective saturation pulse while preventing deterioration of maximum output of a power supply.SOLUTION: A transmission coil includes a plurality of channels, and a power supply has a plurality of systems. The systems are connected to one or more channels respectively, and restrictions are put on the maximum output according to a duty ratio. A high-frequency power pulse is sequentially supplied to the plurality of channels from these systems respectively. The number of systems is set so that the duty ratio of each system is a predetermined value or less when a plurality of high-frequency magnetic field pulses are radiated continuously with a non-radiation time of a predetermined value or less as the overall transmission coil by the sequential radiation of the high-frequency magnetic field pulses from the plurality of channels.SELECTED DRAWING: Figure 3COPYRIGHT: (C)2019,JPO&INPIT【課題】電源の最大出力の低下を防ぎながら、選択飽和パルスの連続照射を可能にするMRI装置を提供する。【解決手段】送信コイルは複数チャンネルを含み、電源は系統が複数ある。系統は、チャンネルの1以上にそれぞれ接続され、かつ、デューティ比に応じて最大出力に制限がある。このような系統から複数のチャンネルに順にそれぞれ高周波電力パルスを供給し、複数のチャンネルから順に高周波磁場パルスを照射させることにより送信コイル全体として所定値以下の非照射時間で複数発連続的に高周波磁場パルスを照射させた場合に、各系統のデューティ比が所定値以下になるように、系統の数が設定されている。【選択図】 図3
