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CT-Based Evaluation of the Shape of the Diaphragm Using 3D Slicer

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Abstract

The diaphragm is the main inspiratory muscle and separates the thorax and the abdomen. In COPD, the evaluation of the diaphragm shape is clinically important, especially in the case of hyperinflation. However, delineating the diaphragm remains a challenge as it cannot be seen entirely on CT scans. Therefore, the lungs, ribs, sternum, and lumbar vertebrae are used as surrogate landmarks to delineate the diaphragm. We herein describe a CT-based method for evaluating the shape of the diaphragm using 3D Slicer—a free software that allows delineation of the diaphragm landmarks—in ten COPD patients. Using the segmentation performed with 3D Slicer, the diaphragm shape was reconstructed with open-source Free Pascal Compiler. From this graduated model, the length of the muscle fibers, the radius of curvature, and the area of the diaphragm—the main determinants of its function—can be measured. Inter- and intra-user variabilities were evaluated with Bland and Altman plots and linear mixed models. Except for the coronal length (p = 0.049), there were not statistically significant inter- or intra-user differences (p values ranging from 0.326 to 0.910) suggesting that this method is reproducible and repeatable. In conclusion, 3D Slicer can be applied to CT scans for determining the shape of the diaphragm in COPD patients.

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Data Availability

All the data are available upon reasonable request to the corresponding author (Olivier Taton).

Abbreviations

COPD:

Chronic obstructive pulmonary disease

CT:

Computed tomography

DICOM:

Digital imaging and communications in medicine

FRC:

Functional residual capacity

PACS:

Picture archiving and communication system

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Acknowledgements

The authors thank Benoit Beyer for advice in diaphragm segmentation, and Samantha Phillips for editing their manuscript.

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The authors declare that no funds, grants, or other support were received during the preparation of this manuscript.

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Authors

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All authors contributed to the study conception, design, material preparation, data collection, and analysis. The first draft of the manuscript was written by Olivier Taton and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Olivier Taton.

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The authors declare that the study was approved by the institutional ethics committee and certify that the study was performed in accordance with ethical standards as laid down in 1964 Declaration of Helsinki and its later amendments or comparable ethical standards.

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Informed consent was obtained from all individual participants included in the study.

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The authors affirm that human research participants provided informed consent for publication of the images in Figs. 1, 2, and 3.

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Taton, O., Van Muylem, A., Leduc, D. et al. CT-Based Evaluation of the Shape of the Diaphragm Using 3D Slicer. J Digit Imaging. Inform. med. (2024). https://doi.org/10.1007/s10278-024-01069-y

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