For the "3 Tesla" MRI scan, you will be lying flat on the MRI scanner, and as with a regular scan, you will have a small needle placed in a vein in your arm to inject the contrast dye. A diuretic, Lasix, will be given to help distend the internal tubes in the kidney to help view your kidney better. The MRI scan will take between 1-2 hours to perform. As with regular scans, you may be asked to hold your breath on occasions.