title: The double-fissure sign: a motion artifact on thin-section CT scans.
abstract: A motion artifact has been observed that may affect the number of fine interstitial lines seen at thin-section (1.5-mm-collimation) computed tomography (CT) for the evaluation of interstitial lung disease. In 14 of 42 patients, one or both major fissures appeared as two parallel lines rather than as a single line. This was more common in the left lung base. Using a phantom, the authors were able to reproduce the phenomenon by simulating cardiac motion. Therefore, this motion may lead to an artifactual increase in the number of interstitial lines.
authors: Department of Radiology, Ontario Cancer Institute, Toronto, Canada.
authors: J R
authors: JR
authors: Mayo
authors: N L
authors: NL
authors: Müller
authors: R M
authors: RM
authors: Henkelman
mesh_terms: D006801:Humans; D008168:Lung / Q000000981:diagnostic imaging*; D009200:Myocardial Contraction; D011658:Pulmonary Fibrosis / Q000000981:diagnostic imaging*; D014057:Tomography, X-Ray Computed