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. 2023 Mar 24;41(8):872–881. doi: 10.1007/s11604-023-01410-5

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© The Author(s) 2023

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 4 — Example of comparison: four categories of view-points in the half-dose method (HDM) and full-dose method (FDM). A 4-year-old female with coronal suture craniosynostosis. Cranial computed tomography (CT) image obtained soon after cranioplasty by the FDM (a–d), and follow-up CT imaged obtained using the HDM at 4 months after the previous CT (e–h). FDM scan parameters: tube voltage, 120 kV; tube current, 220 mA; CTDI-vol, 24.4 mGy; DLP, 589.1 mGy・cm. HDM scan parameters: tube voltage, 120 kV; tube current, 130 mA; CTDI-vol, 12.5 mGy; DLP, 257.8 mGy・cm. In terms of image quality, the brain parenchyma on images obtained by the HDM (e) was relatively coarse as compared to that on images obtained by the FDM (a). However, the corticomedullary boundary of the cerebral hemisphere can be recognized on the HDM image (e). Additionally, the ventricular system (a, e), and 2D (c, g) and 3D (d, h) cranium images seemed to have a similar image quality in HDM and FDM images, without loss of diagnostic value