ID Number		1301
Study Type		Engineering & Physics
Model		64 MHz MRI exposure and patient safety considerations (average / whole body temperature increases, implanted pacemaker interference)
Details		Modeling and analysis of tissue heating & skin temperature due to MRI exposure. In one study regarding imaging of the brain, 35 patients were measured immediately before and after MRI using a 1.5 T system with a 28-cm, open-bore RF transmit/receive head coil. The average body temperature increased from 36.6 +/- 0.2 to 36.6 +/- 0.2 degrees C immediately following imaging (p = not significant). Forehead skin temperature increased from 32.6 +/- 0.6 to 32.8 +/- 0.5 degrees C (p less than .01), and average outer canthus skin temperature increased from 32.1 +/- 0.6 to 32.7 +/- 0.6 degrees C (p less than .01). The highest skin temperature recorded was 34.2 degrees C, and the largest temperature change was +2.1 degrees. There was no statistically significant change in the average skin temperatures of the upper arm and hand. The authors conclude that patients undergoing MRI imaging of the brain with this type of system should experience no significant changes in average body temperature. Local elevations in skin temperatures were physiologically inconsequential. Other studies of eye as well as pacemaker interference where also performed.
Findings		Not Applicable to Bioeffects
Status		Completed With Publication
Principal Investigator		University of Alabama, USA
Funding Agency		NIH, USA
Country		UNITED STATES
References		Shellock, FG Ann. N.Y. Acad. Sci., (1992) 649:260-272 Shellock, FG et al. Br. J. Radiology, (1989) 62:904-909 Shellock, FG et al. Magnetic Resonance in Med., (1989) 11:371-375 Shellock, FG et al. Am J Neuroradiol., (1988) 9:287-291 Shellock, FG et al. Radiology, (1988) 167:809-811
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