method for diffusionsempfindlichen visualisation, procedures for dynamic image and device for magnetic resonance imaging

摘要

An MRI apparatus applies an exciting pulse R1 and a slicing gradient S1 which excites a slice S. Subsequently, it applies a diffusion sensitizing gradient MPG1. Next, it applies a reversing pulse R2 and an FOV limiting gradient RS which limits the data collecting region to have a narrow FOV. Next, it applies a diffusion sensitizing gradient MPG2. Next, it applies a positive and negative reading gradients RA and RB m times alternately and cyclically, and collects MR data from the multiple imaged echoes el DIFFERENCE em, while applying phase encoding gradients W. The phase encoding gradient W has its amplitude-time product set to be 1/( gamma xFOV), where gamma is the magnetogyric ratio. The apparatus produces a diffusion sensitized image at a practical spatial resolution, with artifacts attributable to the body movement being alleviated in exchange for a narrow FOV in the phase encoding axis direction.