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"This image not only represents a technological achievement in medical physics, but also answers important scientific questions. There appear to be no dielectric resonances in the human head at 8 tesla. Other than the expected dizziness during rapid head motion in the scanner which proved to be significant, no physiological effects were detected on the human body at this field strength. Cognitive and cardiac functions proved to be normal both during and following exposure to the static magnetic field for periods of up to two hours. As such, it appears that human imaging at this field strength will now move forward without significant short term safety concerns. Most importantly, human head images could be acquired with only a small fraction of the expected RF power requirements. Indeed, while 1-2 kWatts of power had been expected, only about 100 watts was required. Importantly, signal to noise was excellent as expected at this field strength. There were also no problems with RF penetration."
P.-M. L. Robitaille, 2000 Yearbook of Science and Technology.