To optimize in advance an amount of a desired parameter incorporated in a pulse sequence performed by an imaging scan, a preparation scan is adopted. A preparation scan performing element (1-8T, 8R) performs the preparation scan with the amount of the desired parameter changed every preparatory image, so that data of a plurality of preparatory images at a desired region of the object can be acquired. For example, such parameter is a TI (inversion time) and its amount is a period of TI. A preparatory image producing element (6, 10, 11) produces the acquired data into a plurality of preparatory images for display by means of a displaying element (6, 12). A selection element (6, 13) allows an operator to select a desired preparatory image from the plural preparatory images displayed. By a setting element (6), the amount of the desired parameter given from the selected preparatory image is set to the pulse sequence. Hence the desired parameter of the pulse sequence is able to have an optimum amount before actual imaging. <；IMAGE>；
