Fig 2a: Experimental heating rate of a knee implant #3 at $$$t=0, x=0, y=0$$$ and various $$$z$$$ positions in a clinically relevant orientation. The signal of the central sensor 1 is shown in blue, the lateral in red.

Fig 2b: An axial view of the knee implant with two NTC sensors mounted in sockets that are glued on the implant.

Fig 1a: Comparison of experimental (solid) and simulated (dashed) eddy-current heating of hip implant #1 at scanner coordinates $$$z=-300 \text{ mm}, y=-50 \text{ mm}, x=-145 \text{ mm}$$$. Central sensor in blue, sensors located on the rim in red and green. The EPI sequence was applied from $$$t=0 \text{ to } 20 \text{ s}$$$. The main eddy current circulates along the rim with its large cross section to the vector field $$$dB/dt$$$ of the read gradient z.

Fig 1b: Simulated temperature rise distribution at $$$t=20 \text{ s}$$$. The arrows indicate the sensor positions.