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. 2015 May 13;42(8):1202–1222. doi: 10.1007/s00259-015-3059-9

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© The Author(s) 2015

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted 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. 7 — Background variability for different region diameters for (a) GE Healthcare ToF systems, (b) GE Healthcare non-ToF systems (note different scale on the y-axis), (c) Philips ToF systems, (d) Philips non-ToF systems, (e) Siemens ToF systems, (f) Siemens non-ToF systems (where +RAN and -RAN correspond to data acquired in ‘PROMTS + RANDOMS’ and ‘NETTRUES’ mode, respectively, and where -RAN was normalized for analysis)