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. 2022 May 23;17(9):1717–1721. doi: 10.1007/s11548-022-02663-7

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Fig. 2 — a, b EMT solution in the presence of the fluoroscopy system and c, d accuracy improvement obtained after calibration and correction, for a magnetic sensor oriented like a, c Y and b, d Z axis, respectively. The red grid is formed by joining the test points’ physical positions, the black grid represents the tracked points. The colour map (mm) also accounts for the error in the Z direction, which is not appreciable from the 2D plots