An MRI device for providing high-contrast, high-resolution images of a fluid. The device includes: an envelope for at least partially confining the fluid; a plurality of magnets located at least partially around the envelope; and a CPU to process the images, including a computer readable medium containing instructions for generating at least one third image superimposing at least one image of the first images with at least one image of the second images, whereby a high-contrast, high-resolution real-time continuous images of the fluid is obtained.