Total Proton Resonance Frequency Shift Coefficient in the Porcine Brain to Image Radiofrequency Heating in Ultra-High Field MRI

Devashish Shrivastava¹, Ute Goerke¹, Shalom Michaeli¹, Jingeng Tian¹, Lance DelaBarre¹, John T. Vaughan¹

Total proton resonance frequency (PRF) shift coefficient was measured in the porcine brain to image radiofrequency heating with sub-degree C accuracy in ultra-high field MRI. The total PRF shift coefficient accounted for the effects of the change in molecular screening, volume susceptibility, and conductivity on the local magnetic field with temperature. The total PRF shift coefficient was measured as -0.02 ppm/0C and was significantly different from the traditionally used molecular shielding based PRF shift coefficient of -0.01 ppm/0C.