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. 2017 Sep 21;16(6):1067–1078. doi: 10.1177/1533034617728643

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© The Author(s) 2017

This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 License (http://www.creativecommons.org/licenses/by-nc/4.0/) which permits non-commercial use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://us.sagepub.com/en-us/nam/open-access-at-sage).

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Figure 3. — The linear regression fit between the ultrasound and the optical tracking systems for (A) axial (superior–inferior) with 20-second period, (B) lateral (left–right) with 20-second period, (C) lateral with 10-second period, (D) beam-off with good image quality, (E) poor image, and (F) beam-on. The fitting results between beam-off and beam-on are comparable (r = 0.979 and 0.978, respectively). The fitting result for good image quality is comparable to that for the poor image (r = 0.979 and 0.977, respectively). High frequency (10-second period) has worse fitting result than low frequency (20-second period; r = 0.961 and 0.988, respectively). The fitting results between lateral and axial are comparable, but the slope of the fitting curve is different, which is due to the positional accuracy.