PROBLEM TO BE SOLVED: To provide a magnetic resonance imaging apparatus for generating a myelin image with stable contrast regardless of imaging conditions. According to a predetermined imaging sequence, a measuring unit that applies a high frequency magnetic field and a gradient magnetic field to a subject placed in a static magnetic field to measure an echo signal generated from the subject, and reconstructs from the echo signal. An image reconstructing unit 220 that obtains an image, a plurality of reconstructed images obtained by a plurality of types of imaging with different imaging conditions of an imaging sequence, and a relationship between a quantitative value of a subject and a signal value of the reconstructed image are shown. A parameter estimation unit 232 that estimates the distribution of the quantitative value of the subject using the determined signal function, and an image generation unit that generates an arbitrary image from the distribution of the quantitative value are provided. The longitudinal relaxation rate or the longitudinal relaxation time and the lateral relaxation rate or the lateral relaxation time are estimated, and the image generator generates a myelin image according to a function having the longitudinal relaxation rate or the longitudinal relaxation time and the lateral relaxation rate or the lateral relaxation time as variables. .. [Selection diagram] Figure 2【課題】撮影条件にかかわらず安定したコントラストでミエリン画像を生成する磁気共鳴イメージング装置を提供する。【解決手段】予め定めた撮影シーケンスに従って、静磁場の中に置かれた被検体に高周波磁場および傾斜磁場を印加して被検体から発生するエコー信号を計測する計測部と、エコー信号から再構成画像を得る画像再構成部２２０と、撮影シーケンスの撮影条件を異ならせた複数種類の撮影によって得られた複数の再構成画像、及び被検体の定量値と再構成画像の信号値との関係を定めた信号関数を用いて、被検体の定量値の分布を推定するパラメータ推定部２３２と、定量値の分布から任意の画像を生成する画像生成部とを備え、パラメータ推定部は、定量値として縦緩和速度又は縦緩和時間及び横緩和速度又は横緩和時間を推定し、画像生成部は、縦緩和速度又は縦緩和時間及び横緩和速度又は横緩和時間を変数とする関数に従ってミエリン画像を生成する。【選択図】図２
