Projected lung areas using dynamic X-ray (DXR)

Takuya Hino; Akinori Hata; Tomoyuki Hida; Yoshitake Yamada; Masako Ueyama; Tetsuro Araki; Takeshi Kamitani; Mizuki Nishino; Atsuko Kurosaki; Masahiro Jinzaki; Kousei Ishigami; Hiroshi Honda; Hiroto Hatabu; Shoji Kudoh

European Journal of Radiology Open (Jan 2020)

Projected lung areas using dynamic X-ray (DXR)

Takuya Hino,
Akinori Hata,
Tomoyuki Hida,
Yoshitake Yamada,
Masako Ueyama,
Tetsuro Araki,
Takeshi Kamitani,
Mizuki Nishino,
Atsuko Kurosaki,
Masahiro Jinzaki,
Kousei Ishigami,
Hiroshi Honda,
Hiroto Hatabu,
Shoji Kudoh

Affiliations

Takuya Hino: Center for Pulmonary Functional Imaging, Department of Radiology, Brigham and Women’s Hospital, Harvard Medical School, 75 Francis St., Boston, MA, USA; Corresponding author at: Center for Pulmonary Functional Imaging, Department of Radiology, Brigham and Women’s Hospital and Harvard Medical School, 75 Francis Street, Boston, MA 02115, USA.
Akinori Hata: Center for Pulmonary Functional Imaging, Department of Radiology, Brigham and Women’s Hospital, Harvard Medical School, 75 Francis St., Boston, MA, USA
Tomoyuki Hida: Department of Clinical Radiology, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, Fukuoka, Japan
Yoshitake Yamada: Department of Diagnostic Radiology, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo, Japan
Masako Ueyama: Department of Health Care, Fukujuji Hospital, Japan Anti-Tuberculosis Association, 3-1-24 Matsuyama, Kiyose, Tokyo, Japan
Tetsuro Araki: Center for Pulmonary Functional Imaging, Department of Radiology, Brigham and Women’s Hospital, Harvard Medical School, 75 Francis St., Boston, MA, USA
Takeshi Kamitani: Department of Clinical Radiology, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, Fukuoka, Japan
Mizuki Nishino: Center for Pulmonary Functional Imaging, Department of Radiology, Brigham and Women’s Hospital, Harvard Medical School, 75 Francis St., Boston, MA, USA
Atsuko Kurosaki: Department of Diagnostic Radiology, Fukujuji Hospital, Japan Anti-Tuberculosis Association, 3-1-24 Matsuyama, Kiyose, Tokyo, Japan
Masahiro Jinzaki: Department of Diagnostic Radiology, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo, Japan
Kousei Ishigami: Department of Clinical Radiology, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, Fukuoka, Japan
Hiroshi Honda: Department of Clinical Radiology, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, Fukuoka, Japan
Hiroto Hatabu: Center for Pulmonary Functional Imaging, Department of Radiology, Brigham and Women’s Hospital, Harvard Medical School, 75 Francis St., Boston, MA, USA
Shoji Kudoh: Japan Anti-Tuberculosis Association, 1-3-12 Kanda-Misakicho, Chiyoda-ku, Tokyo, Japan

Journal volume & issue: Vol. 7
p. 100263

Abstract

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Background: Dynamic X-ray (DXR) provides images of multiple phases of breath with less radiation exposure than CT. The exact images at end-inspiratory or end-expiratory phases can be chosen accurately. Purpose: To investigate the correlation of the projected lung area (PLA) by dynamic chest X-ray with pulmonary functions. Material and Methods: One hundred sixty-two healthy volunteers who received medical check-ups for health screening were included in this study. All subjects underwent DXR in both posteroanterior (PA) and lateral views and pulmonary function tests on the same day. All the volunteers took several tidal breaths before one forced breath as instructed. The outlines of lungs were contoured manually on the workstation with reference to the motion of diaphragm and the graph of pixel values. The PLAs were calculated automatically, and correlations with pulmonary functions and demographic data were analyzed statistically. Results: The PLAs have correlation with physical characteristics, including height, weight and BMI, and pulmonary functions such as vital capacity (VC) and forced expiratory volume in one second (FEV1). VC and FEV1 revealed moderate correlation with the PLAs of PA view in forced inspiratory phase (VC: right, r = 0.65; left, r = 0.69. FEV1: right, r = 0.54; left, r = 0.59). Multivariate analysis showed that body mass index (BMI), sex and VC were considered independent correlation factors, respectively. Conclusion: PLA showed statistically significant correlation with pulmonary functions. Our results indicate DXR has a possibility to serve as an alternate method for pulmonary function tests in subjects requiring contact inhibition including patients with suspected or confirmed covid-19.

Published in European Journal of Radiology Open

ISSN: 2352-0477 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Medicine: Medicine (General): Medical physics. Medical radiology. Nuclear medicine
Website: http://www.journals.elsevier.com/european-journal-of-radiology-open/

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