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. Author manuscript; available in PMC: 2022 Nov 1.
Published in final edited form as: IEEE Trans Biomed Eng. 2021 Oct 19;68(11):3399–3409. doi: 10.1109/TBME.2021.3072036

Fig. 5.

Fig. 5.

Left: Relative tracking accuracy. A linear stage was used to move the probe to 217 known locations. The true distance of each point from the first location is plotted on the X-axis and the measured distance from the first location is plotted on the Y axis. Inset into this plot is a histogram of the difference between the known and measured locations. The average error was 0.7 ± 0.5 mm. Right: The probe was randomly scanned over the surface of a sphere and the recorded coordinates are displayed as points. A best-fit sphere was constructed based on those locations to ensure the points followed a spherical shape. Inset into this plot is a histogram of the measured distance from the sphere center at each point minus the radius of the best-fit sphere. The deviation from the model was 0.0 ± 0.9 mm.