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. 2015 Jun 2;10:1027–1033. doi: 10.2147/COPD.S81748

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© 2015 Kurashima et al. This work is published by Dove Medical Press Limited, and licensed under Creative Commons Attribution – Non Commercial (unported, v3.0) License

The full terms of the License are available at http://creativecommons.org/licenses/by-nc/3.0/. Non-commercial uses of the work are permitted without any further permission from Dove Medical Press Limited, provided the work is properly attributed.

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Percentages of low attenuation area (%LAA) and frequency of COPD exacerbation.

Notes: Panels (A–C) demonstrate the relationship between frequency of COPD exacerbation and %LAA in total lobe (right B1–B10, [A]), upper lobe (right B1–B3, [B]) and lower lobe (right B6–B10, [C]). Each %LAA value shows mean value of 3 cm circle images exactly perpendicular to the axis of the airways at central zone (2 cm from the entrance of segmental bronchus), peripheral zone (2 cm from the pleura), and middle zone (halfway point of central and peripheral points) of each bronchus.

Abbreviation: COPD, chronic obstructive pulmonary disease.