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Insights into Imaging
Fig. 2 | Insights into Imaging

Fig. 2

From: The impact of lung parenchyma attenuation on nodule volumetry in lung cancer screening

Fig. 2

Examples of the measurement of lung nodules in lung parenchyma with attenuation changes. a A small subpleural nodule in the right lower lobe of the lung of a patient with known interstitial lung disease. b The nodule is shown with a region of interest drawn manually around it, with a rim of about 5-mm thickness. The average attenuation of the adjacent lung parenchyma on this slice is − 462.5 HU. c A nodule in the anterolateral aspect of the left upper lobe of the lung in a patient with known centrilobular and paraseptal emphysema. d Manual measurement of the average attenuation of the surrounding lung parenchyma (− 811 HU)

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