Classification of secondary pulmonary lobular structural imaging
signs
To define the imaging features of secondary pulmonary lobular structure
on CT images, then building simulation schematics to strengthen
cognition and serve as a unified standard for evaluation (Fig.1, 2). The
secondary pulmonary lobular structural imaging signs are defined as a
set of CT imaging of pulmonary lobules and its related structures, which
are typified by five major categories: Ⅰ Lobular size sign, Ⅱ Fusion
lobular sign, Ⅲ interlobular septal thickening sign, Ⅳ intralobular
interstitial thickening sign, Ⅴ intralobular vascular thickening sign
(Fig. 2).