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The influence of image reconstruction methods on the diagnosis of pulmonary emphysema with convolutional neural network

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Abstract

This study investigated the influence of iterative reconstruction (IR) methods on computed tomography (CT) images when training convolutional neural network (CNN) models to diagnose pulmonary emphysema. To evaluate the influence of the IR algorithm on CNN, the present study comprised two steps: the comparison of noise reduction by IR algorithms using phantom examinations and the change in performance of CNN with IR algorithms using patient data. We retrospectively analyzed 97 patients. Raw CT data were reconstructed using the filtered back-projection (FBP) and adaptive statistical iterative reconstruction V (ASIR-V) algorithms with blending levels of 30%, 50%, and 70%. The models were trained using reconstructed CT images and were named the FBP, ASIR-V30, ASIR-V50, and ASIR-V70 models. The mean and the standard deviation of the CT values were 11.3 ± 21.2 at FBP, 11.0 ± 17.3 at ASIR-V30, 11.0 ± 14.4 at ASIR-V50, and 11.0 ± 11.8 at ASIR-V70. For all the evaluation metrics, the best values were obtained with the FBP model applied to the ASIR-V70 test images. The worst values were obtained with the ASIR-V70 model applied to the FBP test images. The model trained with FBP images exhibited significantly better performance than the models trained using IR images. The reduction in image noise with the IR algorithm on the test images contributed to improving the accuracy of the classification of emphysema subtypes using CNN.

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Funding

The authors state that this work has not received any funding.

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Authors and Affiliations

  1. Department of Radiology, Teikyo University Hospital, Mizonokuchi, 5-1-1 Futago, Takatsu-ku, Kawasaki, Kanagawa, 213-8507, Japan

    Toshiki Takeshita, Masao Tago, Masaki Yorita, Mariko Ikezoe & Kentaro Nishizawa

  2. Department of Radiology, Kanto Central Hospital of the Mutual Aid Association of Public School Teachers, 6-25-1 Kamiyoga, Setagaya-ku, Tokyo, 158-8531, Japan

    Atsushi Nambu

  3. Department of Radiological Sciences, Faculty of Health Sciences, Komazawa University, 1-23-1 Komazawa, Setagaya-ku, Tokyo, 154-8525, Japan

    Taiki Magome

  4. Department of Health Sciences, Faculty of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan

    Masayuki Sasaki

Authors
  1. Toshiki Takeshita
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  2. Atsushi Nambu
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  3. Masao Tago
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  5. Mariko Ikezoe
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  7. Taiki Magome
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  8. Masayuki Sasaki
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Correspondence to Toshiki Takeshita.

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This study was approved by the Ethics Committee of Teikyo University (approval number: 19-036-2).

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Takeshita, T., Nambu, A., Tago, M. et al. The influence of image reconstruction methods on the diagnosis of pulmonary emphysema with convolutional neural network. Radiol Phys Technol 16, 488–496 (2023). https://doi.org/10.1007/s12194-023-00736-z

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  • DOI: https://doi.org/10.1007/s12194-023-00736-z

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