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Expiratory computed tomographic techniques: A cause of a poor rate of change in lung volume

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Abstract

Ninety-nine patients (29 males and 70 females; mean age, 57.1 years; range, 22–81 years) were included in this study to evaluate the factors affecting smaller lung volume changes in expiratory high-resolution computed tomography performed to depict air trapping. All patients underwent inspiratory and expiratory chest thin-section CT examinations and pulmonary function tests. Air trapping on CT images was graded subjectively. All variables (age, sex, diagnosis, pulmonary function index, and air trapping score) were compared with the degree of change in lung volume between the inspiratory and expiratory CT examinations. The variables affecting a lower degree of volume change were vital capacity, forced vital capacity (FVC), forced expiratory volume in 1 s (FEV1.0), and the FEV1.0/FVC ratio. Bronchiolitis obliterans was the dominant diagnosis in patients with insufficient degrees of breath holding and in patients with negative air trapping scores despite an abnormal air trapping index. An insufficient degree of lung changes between inspiration and expiration on CT examinations represented bronchiolitis obliterans, which resulted in low FEV1.0 and FEV1.0/FVC values. Changes in the time gap from the announcement of exhalation and breath holding to the start of scanning most effectively indicated air trapping in patients with bronchiolar disorders.

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Acknowledgments

This report was presented orally at the 66th Annual Scientific Congress of the Japanese Society of Radiological Technology and was recommended for publication by the chairman.

Conflict of interest

All authors have no direct or indirect financial interest in the products under investigation or subject matter discussed in this manuscript.

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Authors and Affiliations

  1. Department of Radiological Science, Faculty of Health Sciences, Junshin Gakuen University, 1-1-1 Chikushigaoka, Minami-ku, Fukuoka, 815-8510, Japan

    Keiko Morikawa

  2. Department of Radiology, Faculty of Medicine, Oita University, 1-1 Idaigaoka, Hasama-machi, Yufu, Oita, 879-5593, Japan

    Fumito Okada & Hiromu Mori

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  1. Keiko Morikawa
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  2. Fumito Okada
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  3. Hiromu Mori
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Correspondence to Keiko Morikawa.

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Morikawa, K., Okada, F. & Mori, H. Expiratory computed tomographic techniques: A cause of a poor rate of change in lung volume. Radiol Phys Technol 8, 153–159 (2015). https://doi.org/10.1007/s12194-014-0304-z

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  • DOI: https://doi.org/10.1007/s12194-014-0304-z

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