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To determine changes in corneal temperature that are associated with high-field-strength magnetic resonance imaging performed with a transmit/receive head coil at local SARs exceeding the level recommended by the FDA (U.S. Food and Drug Administration).
There was a statistically significant increase in the average corneal temperature (32.7°C +/- 0.7 before imaging, 33.2°C +/- 0.5 after). The changes in corneal temperature ranged from 0.0 °C to 1.8°C (mean, 0.5°C). The highest corneal temperature measured after imaging was 34.4°C. The authors conclude that clinical magnetic resonance imaging with use of a head coil at the SARs studied causes relatively minor increases in corneal temperature that do not seem to pose any thermal hazard to ocular tissue.