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Congress: ECR25
Poster Number: C-12409
Type: Poster: EPOS Radiologist (scientific)
DOI: 10.26044/ecr2025/C-12409
Authorblock: H. Otsuji, T. Higashino, M. Shiraiwa, K. Hiraoka, M. Samejima, S. Morishita; Himeji city, Hyougo Prefecture/JP
Disclosures:
Hideaki Otsuji: Nothing to disclose
Takanori Higashino: Nothing to disclose
Misaki Shiraiwa: Nothing to disclose
Kiyomi Hiraoka: Nothing to disclose
Masakazu Samejima: Nothing to disclose
Sho Morishita: Nothing to disclose
Keywords: Anatomy, Lung, CT, Observer performance, Congenital
Purpose ObjectivesInterlobar collateral ventilation was discovered by Van Allen et al. [1] about 100 years ago and has been proven since then. Recently, some papers have been published that use the latest equipment and noble gases [2-6], but these equipments cannot distinguish IIF (Incomplete Interlobar Fissure) and CIF (Complete Interloper Fissure). Here, we report on our analysis of pulmonary lobar collateral ventilation from the inspiration and expiration CT using conventional CT scanners.
Read more Methods and materials Subjects and MethodsThe study included 192 patients with interstitial pneumonia who underwent inspiration and expiration on the same day by 80 rows or 16rows CT. The lung field density changes on the mediastinal side during inspiration and expiration were compared between CIFs and IIFs. The density of 1.5 cm diameter on the upper lobes of the mediastinal side was classified as high-density if higher than the lower lobes and as iso-density if equivalent. A significance test was performed to assess...
Read more Results DiscussionThe results of the present study showed that in CIF, the lung field density near the interlobar fissure of the bilateral upper lobes was high-density in a greater number of cases. They also showed that less cases shifted from iso-density on inspiration to high-density on expiration in IIF than in CIF. This suggests that air moves from the lower lobe to the upper lobe through the fusion of the interlobar fissure.Lobar collateral ventilation of the lungs was confirmed in experiments...
Read more Conclusion ConclusionThe change in density between the upper and the lower lobes during inspiration and expiration is smaller in IIF than CIF. This suggests that IIF has air movement through the fusion area from the lower lobe to the upper lobe.
Read more References [1] Van Allen CM, Lindskog GE, Richter HG (1931)   COLLATERAL RESPIRATION. TRANSFER OF AIRCOLLATERALLY BETWEEN PULMONARY LOBULES  J Clin Invest. 1931;10(3):559-590.  [2] Marshall H, Deppe MH, Parra-Robles J, et al (2012)Direct visualisation of collateral ventilation in COPD with hyperpolarised gas MRIThorax 2012;67:613-617.doi:10.1136/thoraxjnl-2011-200864 [3] Capaldi DPI, Zha N, Guo F, et al (2016)Pulmonary Imaging Biomarkers of Gas Trapping and Emphysema in COPD: 3He MR Imaging and CTParametric Response MapsRadiology: 279(2) 597-608,doi: 10.1148/radiol.2015151484. Epub 2016 Jan 8. [4] Gutberlet M, Kaireit TF, Voskrebenzev A, et al...
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