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.