GRADIENT MAGNETIC FIELD APPLYING DIRECTION DETERMINING METHOD FOR DIFFUSION MOTION DETECTION, DIFFUSION COEFFICIENT MEASURING METHOD, AND MRI DEVICE

摘要

PROBLEM TO BE SOLVED: To accurately determine the direction of a gradient magnetic field for the detection of a diffusion motion, which should be applied to measure the diffusion coefficient of an interest region. SOLUTION: Three diffusion emphasized images are generated by a pulse sequence for imaging, wherein a gradient magnetic field MPG for the detection of a diffusion motion is applied to an X axis, a Y axis and a Z axis (steps S1 to S3). A red color, a green color and a blue color are allotted and synthesized for respective diffusion emphasized images (step 4), and a brightness inverted image for the synthesized image is displayed (step 5). An interest region is indicated on the brightness-inverted image (step 6). The direction of the gradient magnetic field MPG for the detection of the diffusion motion, which is applied to measure the diffusion coefficient of the interest region is determined based on the hue of the interest region on the brightness inverted image (step 7). By applying the gradient magnetic field MPG for the detection of the diffusion motion in the determined direction, the diffusion coefficient for the volume of the interest region is measured by a pulse sequence for the measurement of the diffusion coefficient (steps S8 and S9). Thus, the diffusion coefficient of a nerve fiber can be accurately measured.