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Investigation of optimal viewing size for detecting nodular ground-glass opacity on high-resolution computed tomography with cine-mode display

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Abstract

We evaluated the effect of the displayed image sizes on observers’ ability to detect nodular ground-glass opacity (n-GGO) on CT and investigated the optimal viewing size for soft-copy reading at CT screening for lung cancer. A total of 46 patients’ high-resolution computed tomography (HRCT) images (22 patients with one GGO; 24 without GGO) were displayed on a monochromatic liquid crystal display monitor at a resolution of 1,200 × 1,600. HRCT was presented on the screen with cine-mode display. We compared two viewing sizes (original size, i.e., the image displayed with a zoom factor of 1 in which each pixel value in the image is displayed as one pixel on the display: 13 cm × 13 cm; fit size, i.e., by zooming the captured image until it occupies the entire screen: 30 cm × 30 cm) in terms of radiologists’ performance for detecting n-GGO on HRCT and the viewing times required for soft-copy reading decisions. Observer performance was analyzed in terms of the receiver operating characteristic (ROC) curve. A statistically significant improvement was found with the original size in the average area-under-the-ROC curve values for the accuracy of diagnosis and the viewing times compared to the fit size (P < 0.05). The original size with cine-mode display leads to increased lung GGO detection at CT screening for lung cancer, and the reduced time spent performing the diagnosis offers cost savings.

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Acknowledgments

The authors sincerely thank Drs Fukuda H, Higami T, Oonishi M, Ninoi T, Tsumura M, Daikokuya H, Sasada S, Awai K, Kobayashi S, and Tanaka S, for participating as reviewers and observers. This study was partly supported by a grant from the Japanese Ministry of Health, Labour and Welfare, no. H18-Shinko-011.

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Authors and Affiliations

  1. Department of Radiology, Osaka Prefectural Medical Center for Respiratory and Allergic Disease, Osaka Prefectural Hospital Organization, 3-7-1 Habikino, Habikino, Osaka, 583-8588, Japan

    Michihiro Yamaguchi, Yuichi Bessho & Tatsuro Inoue

  2. Department of Radiology, Kinki University Hospital, 377-2, Ono-Higashi, Osaka-Sayama, Osaka, 589-8511, Japan

    Yoshiyuki Asai

  3. Department of Clinical Research and Development, Osaka Prefectural Medical Center for Respiratory and Allergic Disease, Osaka Prefectural Hospital Organization, 3-7-1 Habikino, Habikino, Osaka, 583-8588, Japan

    Tomoshige Matsumoto

  4. Division of Medical Technology and Science, Department of Medical Physics and Engineering, Course of Health Science, Graduate School of Medicine, Osaka University, 1-7 Yamadaoka, Suita, Osaka, 565-0871, Japan

    Kenya Murase

Authors
  1. Michihiro Yamaguchi
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  2. Yuichi Bessho
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  3. Tatsuro Inoue
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  4. Yoshiyuki Asai
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  5. Tomoshige Matsumoto
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  6. Kenya Murase
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Correspondence to Michihiro Yamaguchi.

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Yamaguchi, M., Bessho, Y., Inoue, T. et al. Investigation of optimal viewing size for detecting nodular ground-glass opacity on high-resolution computed tomography with cine-mode display. Radiol Phys Technol 4, 13–18 (2011). https://doi.org/10.1007/s12194-010-0099-5

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  • DOI: https://doi.org/10.1007/s12194-010-0099-5

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