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Abstract #0779

Systemic in Vivo Radio-Frequency Heating in Porcine Models with a 12.5 Diameter, 8 Channel, 7 T (296 MHz) Head Coil

Devashish Shrivastava1, Timothy Hanson, Jeramy Kulesa, Jinfeng Tian2, Gregor Adriany, John Thomas Vaughan

1CMRR, Radiology, University of Minnesota, Minneapolis, MN, United States; 2Univeristy of Minnesota, Minneapolis, MN, United States

In vivo radio-frequency (RF) heating was measured due to a 7T head coil in four anesthetized porcine models (N = 4). Temperatures were measured using fluoroptic probes in the scalp; 5 mm, 10 mm, 15 mm, and 20 mm in the brain; and rectum. Continuous wave, 296 MHz, RF power was delivered for ~3 hours using the head coil. The whole head average SAR was maintained close to 3 W/kg. Systemic, uniform heating up to ~1.85 C was produced. No RF heating induced adverse thermo-physiologic temperature response was detected as measured by the difference in post-RF and pre-RF temperature slopes.