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. 2018 Dec 17;6:24–32. doi: 10.1016/j.ejro.2018.12.001

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© 2018 The Authors

This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

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Fig. 2 — Region-of-interest (ROI) placement. The ROIs were defined to represent homogeneous soft-tissue areas in the relevant antero-posterior range in the phantom, and inside and around the stronger attenuation of the spine region. The ROI areas were: 700 mm² for ROI 1, 900 mm² for ROIs 2–3, and 2100 mm² for ROIs.4–6.