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Quantitative Kinetic Analysis of Lung Nodules Using the Temporal Subtraction Technique in Dynamic Chest Radiographies Performed with a Flat Panel Detector

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Abstract

Early detection and treatment of lung cancer is one of the most effective means of reducing cancer mortality, and to this end, chest X-ray radiography has been widely used as a screening method. A related technique based on the development of computer analysis and a flat panel detector (FPD) has enabled the functional evaluation of respiratory kinetics in the chest and is expected to be introduced into clinical practice in the near future. In this study, we developed a computer analysis algorithm to detect lung nodules and to evaluate quantitative kinetics. Breathing chest radiographs obtained by modified FPD and breath synchronization utilizing diaphragmatic analysis of vector movement were converted into four static images by sequential temporal subtraction processing, morphological enhancement processing, kinetic visualization processing, and lung region detection processing. An artificial neural network analyzed these density patterns to detect the true nodules and draw their kinetic tracks. Both the algorithm performance and the evaluation of clinical effectiveness of seven normal patients and simulated nodules showed sufficient detecting capability and kinetic imaging function without significant differences. Our technique can quantitatively evaluate the kinetic range of nodules and is effective in detecting a nodule on a breathing chest radiograph. Moreover, the application of this technique is expected to extend computer-aided diagnosis systems and facilitate the development of an automatic planning system for radiation therapy.

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Acknowledgments

We would like to acknowledge the students of Kodera Laboratory, Nagoya University, Japan, for their cooperation in the experiments and helpful discussions.

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Authors and Affiliations

  1. Department of Radiology, Shizuoka Children’s Hospital, 860 Urushiyama, Aoi-ku, Shizuoka, 420–8660, Japan

    Yuichiro Tsuchiya

  2. Department of Radiological Technology, School of Health Sciences, Nagoya University, 1-1-20 Daikou Minami, Higashi-ku, Nagoya, 461-8673, Japan

    Yoshie Kodera

  3. Department of Radiological Technology, School of Health Sciences, Kanazawa University, Kodatsuno 5-11-80, Kanazawa, 920-0942, Japan

    Rie Tanaka & Shigeru Sanada

Authors
  1. Yuichiro Tsuchiya
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  2. Yoshie Kodera
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  3. Rie Tanaka
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  4. Shigeru Sanada
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Correspondence to Yuichiro Tsuchiya.

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Tsuchiya, Y., Kodera, Y., Tanaka, R. et al. Quantitative Kinetic Analysis of Lung Nodules Using the Temporal Subtraction Technique in Dynamic Chest Radiographies Performed with a Flat Panel Detector. J Digit Imaging 22, 126–135 (2009). https://doi.org/10.1007/s10278-008-9116-1

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  • DOI: https://doi.org/10.1007/s10278-008-9116-1

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