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By measuring these magnetic fields, scientists can accurately pinpoint the location of the cells that produce each field. In this way, they can identify zones of the brain that are producing abnormal signals. The MEG Laboratory is located in Hermann Hospital, the teaching hospital of The University of Texas-Houston Health Science Center, and is operated by members of the university's Department of Neurosurgery. Magnetic resonance imaging uses magnetism and radio waves to produce an image of the inside of the body. This technique is particularly useful for imaging the spinal cord, areas of the head where soft and hard tissue meet, and areas affected by stroke that cannot be seen well on CT scans.