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. Author manuscript; available in PMC: 2014 Sep 1.
Published in final edited form as: J Thorac Imaging. 2013 Sep;28(5):10.1097/RTI.0b013e31829efbe9. doi: 10.1097/RTI.0b013e31829efbe9

Figure 3.

Figure 3

This figure shows three-dimensional reconstructions of CT scans from one subject obtained at end expiration (A) and suspended inspiration (B). The three-dimensional analysis of low attenuation regions using the -950 HU threshold analysis is shown in panels C and D. It can clearly be seen that the lung is larger at end inspiration (6032 mL) compared to end expiration (3988 mL) (B), particularly noticeable in the apical region and the diaphragmatic surface, and that there are more highlighted regions indicating more low attenuation regions (21% inspiration vs. 14% expiration) (D). This figure gives an indication of the difference that lung volume can make for quantitative densitometry analysis of the lung.