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. 2015 Jun 30;26:892–899. doi: 10.1007/s00330-015-3870-5

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© The Author(s) 2015

Open Access This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 4 — Mean slope of the edge profile between bone and brain parenchyma. The mean slope, defined as Δy/Δx, of protocol B is higher than in protocol A, meaning a sharper edge. Note the higher CT number (HU) of bony structures in protocol B and a higher contrast (relative signal) between bone and brain.