PRFS-based MRTI images of 12 cm diameter gel phantom inside MAPA applicator with four peripheral silicone oil references – using body coil of GE 1.5T Excite MR system:
a) With circulating distilled water. Note the phase distortion caused by motion artifacts of moving water that bleed over into distortion of the gel phantom temperature rise signal.
b) Same gel phantom and PRFS measurement using circulating D2O instead of water as the coupling fluid.