PROBLEM TO BE SOLVED: To suppress image quality deterioration caused by a respiratory movement and its change and to improve data acquisition ratio.SOLUTION: Regular measurement is repeated by prescribed unit, navigation measurement acquiring one or a plurality of navigator echoes between measurements in two prescribed units temporally adjacent is performed, and determination of continuation/non-continuation of the regular measurement, and determination of whether it is necessary to abandon immediately preceding measurement data are performed. At least two navigator echoes are used, a position of a part to be monitored by the navigation measurement and displacement width to be reference of displacement stability are used to determine whether or not they satisfy reference displacement obtained beforehand and reference displacement width.SELECTED DRAWING: Figure 5COPYRIGHT: (C)2019,JPO&INPIT【課題】呼吸動やその変化に起因する画質劣化を抑制するとともにデータ取得率を向上する。【解決手段】本計測を所定単位で繰り返し、時間的に隣接する２つの前記所定単位の計測の間に１乃至複数のナビゲータエコーを取得するナビゲーション計測を行い、本計測の継続／非継続の判定及び直前の計測データの破棄の要否の判定を行う。判定は、少なくとも２つのナビゲータエコーを用いて、ナビゲーション計測によってモニターする部位の位置と変位安定性の基準である変位幅とを用い、それらが予め求めた基準変位及び基準変位幅を満たすか否かを判定する。【選択図】図５
