Physiological and macropathological results in swine model at 123 MHz in experimental setup for investigating thresholds of tissue damage

Motivation: Radiofrequency used during MRI exams heat tissue. The temperature increase is unknown and the thermoregulatory responses still need to be analyzed. Goal(s): To analyse the temperatures within the thresholds. Are any changes seen. Is the biological simulation replicable in living swine. Approach: SAR levels in the 2.mode were planned in the swine as an animal model. Results: The thermoregulatory model (temperature going into a plateau) is only one pattern next to 3 other patterns (linear, parabolic, and sinusoidal). So these will change the calculations of simulations for temperatures in humans receiving MRI exams. Impact: Radiofrequency induced temperature changes in MRI exams need to be reevaluated as new thermoregulatory patterns are observed. Increased internal temperatures are subconsciously discerned causing thermoregulation to avoid tissue damage.