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Study: The new buzz on detecting tinnitus
Date:10/3/2009

es the very small magnetic fields generated by intracellular electrical currents in the neurons of the brain. Only 20 sites in the U.S., including Henry Ford, are equipped with a MEG scanner. MEG is presently used at these sites for pre-surgical brain mapping for patients undergoing surgery for brain tumor removal or Epilepsy treatment.

"With PET and fMRI, most of the auditory cortex of the brain lights up with activity during imaging. MEG, however, is a much more sophisticated machine and it can identify a specific tone or topic point, so only a small area in the brain lights up. It's like having the lights on in only the city of Detroit, compared to having the lights on in the entire state of Michigan," explains Dr. Seidman, director of the Otolaryngology Research Laboratory and co-director of the Tinnitus Center at Henry Ford.

For the study, Dr. Seidman and his colleagues collected MEG results from 17 patients with tinnitus and 10 patients without tinnitus. MEG data were collected for 10 minutes, and then digitally filtered. Study participants wore ear plugs to eliminate outside sounds, and kept their eyes open and fixated on one point on the ceiling in the room during testing.

With tinnitus patients who have ringing in one ear (unilateral tinnitus), MEG imaging detected the greatest amount of activity in the auditory cortex on the opposite site of the brain from their perceived tinnitus. For patients with ringing in the head or both ears (bilateral tinnitus), MEG imaging revealed activity in both hemispheres of the brain, with greater activity appearing in the opposite side of the brain of the strongest perception of tinnitus.

Patients without tinnitus had multiple small active areas in the brain, but no particular areas were found to be highly coherent during the 10-minute MEG scan.

Ultimately, Dr. Seidman says the study establishes MEG as an effective clinical tool for localizing the probably source of tinnitus
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Contact: Krista Hopson
khopson1@hfhs.org
313-874-7207
Henry Ford Health System
Source:Eurekalert

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