Fig. 1
From: The impact of lung parenchyma attenuation on nodule volumetry in lung cancer screening
Example of the implementation of the nodule measurement protocol. A small nodule is identified in the posterior segment of the left lower lobe of the lung. a, b The volumetric tools [Vue PACS, ver. 11.4.01.1011; Carestream© (tool 1) and Syngo via VB20, Siemens© (tool 2)] are used to segment the nodule, yielding volumes of 48.5 and 75 mm3, respectively. c, d The longest orthogonal diameters are measured manually using electronic calipers tools in both software packages. e, f A region of interest (5-mm thickness) is drawn manually around the nodule for determination of the average attenuation of adjacent lung parenchyma (− 768.4 and − 795 HU obtained with tools 1 and 2, respectively). The images have been edited to improve the readability of the measurements