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. 2023 May 15;13(7):4475–4492. doi: 10.21037/qims-22-1394

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2023 Quantitative Imaging in Medicine and Surgery. All rights reserved.

Open Access Statement: This is an Open Access article distributed in accordance with the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International License (CC BY-NC-ND 4.0), which permits the non-commercial replication and distribution of the article with the strict proviso that no changes or edits are made and the original work is properly cited (including links to both the formal publication through the relevant DOI and the license). See: https://creativecommons.org/licenses/by-nc-nd/4.0.

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Measurement of HU values on a preoperative lumbar spine CT scan. The orange lines indicate the slicing planes. The orange circles indicate the ROI. (A) The ROI at the midsagittal plane image for L4 and L5; (B) The slicing planes at the midsagittal plane for L4 and L5; (C) The ROI at the axial plane image for L4 and L5; (D) The ROI at the midsagittal plane image for S1; (E) The slicing planes at the midsagittal plane for S1; (F) The ROI at the axial plane image for S1. ROI, region of interest; HU, Hounsfield unit.