Figure 5
Printed array in MRgFUS heating and imaging. (a) Scan of gel phantom on a fibroid transducer using printed array. Red arrow shows the location of array, orange highlights location of the transducer, blue line shows location of slice used to track heating, and yellow shows the approximate location of heating. (b) Heating point inside of phantom (i) without and (ii) with the array present. Heating is tracked with body coil in both cases for maintain the same conditions for comparison. (iii) Plot showing temperature change at the focal point vs. time. (c) (i) Scan of gel phantom on fibroid transducer highlighting placement of coil (arrow) between top (blue) and bottom (red) gel phantoms. Thermometry scans (ii) with coil placed between gel phantoms and (iii) without. (d) Illustration showing the printed array wrapped around the skull and brain phantom containing a bovine brain submerged in water inside the head transducer. (e) Sagittal image of the brain phantom with overlaid heating map tracked with the 4-channel array. Hot spot near center of phantom is the focal point of transducer. Areas inside plastic and air regions of the phantom have large phase shift and appear as random hotspots in image. Regions of the brain near the front of the head phantom where the coil array has higher SNR and less phase error compared to the back of the head. (f) Axial scan of the skull and brain phantom showing anatomical image quality from the 4-channel array.
