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. 2019 Oct 1;1(1):20190036. doi: 10.1259/bjro.20190036

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© 2019 The Authors. Published by the British Institute of Radiology

This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International License, which permits unrestricted use, distribution and reproduction in any medium, provided the original author and source are credited.

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Figure 12. — Patient with cystic fibrosis with mosaic perfusion pattern related to small airway disease. Mosaic perfusion pattern appears as abnormal areas of decreased attenuation associated with small vessel size (orange arrows) alternating with preserved areas in which larger vessels respond to an increase in arterial blood flow (blue arrows) (a). Note the improved visibility of normal and abnormal areas by using 4 mm-thick mIP post-processing with lowering of the window level and reduction of the window width (−820, 572 HU) (b). Such an aspect should not be confused with GGO with mosaic appearance, in which areas of GGO are the abnormal zones. GGO, ground glass opacity; HU, Hounsfield unit; mIP, minimum intensity projection.