Problem to be solved: to obtain a diffusion weighted image which minimizes the imaging time without limitation to the imaging conditions and improves the accuracy of the quantitative value.The magnetic resonance imaging apparatus 100 is an imaging section 114 for making the intensity of the mpg pulse different, and repeating the measurement of the nuclear magnetic resonance signal, and an image forming section for producing an image for each of different mpg pulses using the nuclear magnetic resonance signal acquired by each measurement performed by the imaging section Includes 120.The image forming section 120 comprises an unnecessary signal judging section 111C for judging the nuclear magnetic resonance signal which is not required for image formation out of the nuclear magnetic resonance signal to be measured every time the imaging of the intensity of the mpg pulse is different.The image forming section 120 generates an image using the nuclear magnetic resonance signal excluding the unnecessary signal determined by the unnecessary signal judging section 111C.Diagram【課題】撮像条件への制限なく、撮像時間を最小限に留め、かつ定量値の精度を向上させた拡散強調画像を得る。【解決手段】磁気共鳴イメージング装置１００は、ＭＰＧパルスの強度を異ならせて、核磁気共鳴信号の計測を繰り返し行う撮像部１１４と、撮像部１１４が行う各計測で取得した核磁気共鳴信号を用いて、異なるＭＰＧパルス毎に画像を作成する画像作成部１２０と、を備える。画像作成部１２０は、ＭＰＧパルスの強度が異なる撮像毎に、計測される核磁気共鳴信号のうち画像作成に不要となる核磁気共鳴信号を判定する不要信号判定部１１１Ｃを備える。画像作成部１２０は、不要信号判定部１１１Ｃが決定した不要信号を除いた核磁気共鳴信号を用いて画像を作成する。【選択図】図１
