The MRE procedure is useful for identifying tissue stiffness. For the MRE procedure, you will lie on your back on the examination table, and a pneumatic driver (a light-weight, clear plastic drum, about 10 inches wide and 1 inch thick) will be placed over the upper abdomen. You will feel a vibration (like a cell phone or beeper vibrating). This vibration will create very small waves in the body. The scanner will then receive the vibrations from the liver and use them to create images of the liver tissue. The MRE will take about 40 seconds. The driver will only be turned on during this time.