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Usefulness of large beam-shaping filters at different tube voltages of newborn chest CT

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Abstract

Background: To investigate optimizing the use of different beam shaping filters (viz. small, medium and large) when using different tube voltages during the newborn chest computed tomography (CT) on a GE Lightspeed VCT scanner. Methods: We used pediatric anthropomorphic phantoms with a 64 detector-row CT scanner while scanning the chest. A real-time skin dosimeter (RD − 1000; Trek Corporation, Kanagawa, Japan) was positioned into the phantom center of the body, the surface of the body back, and the right and left mammary glands. We performed and compared six scan protocols using small, medium, and large beam shaping filters at 80 and 120 kVp protocols. Result: There were no significant differences in the image noise for the chest scan among the different beam shaping filters. By using the large beam shaping filter at 80 kVp, it was possible to reduce the exposure dose by 5% in comparison with the small beam shaping filter, and by 10% in comparison with the medium beam shaping filter. By using the large beam shaping filter at 120 kVp, it was possible to reduce the exposure dose by 15% in comparison with the small beam shaping filter and by 20% in comparison with the medium beam shaping filter (p < 0.01). Conclusion: The large beam shaping filter had the most dose reduction effect during newborn chest CT on a GE Lightspeed VCT scanner. The additional copper filtration being present in the large bowtie filter of the GE Lightspeed CT scanner when using different tube voltages is more effective in reducing radiation exposure in children.

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Funding

The authors declare that no funds, grants, or other support were received during the preparation of this manuscript.

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Authors and Affiliations

  1. Department of Radiological Technology, Faculty of Health Science and Technology, Kawasaki University of Medical Welfare, 288, Matsushima, Kurashiki, 701-0193, Kurashiki-city, Okayama, Japan

    Takanori Masuda, Shinichi Arao, Atsushi Ono & Junichi Hiratsuka

  2. Department of Medical Physics, Faculty of Life Sciences, Kumamoto University, 1-1-1 Honjo, 860-8556, Kumamoto, Japan

    Yoshinori Funama

  3. Department of Diagnostic Radiology, Graduate School of Medical Sciences, Kumamoto University, 1-1-1 Honjo, 860-8556, Kumamoto, Japan

    Takeshi Nakaura

  4. Department of Diagnostic Radiology, Tsuchiya General Hospital, Nakajima-cho 3-30, Naka-ku, 730-8655, Hiroshima, Japan

    Tomoyasu Sato

  5. Department of Pediatric cardiology, Tsuchiya General Hospital, Nakajima-cho 3-30, Naka-ku, 730-8655, Hiroshima, Japan

    Kotaro Urayama

  6. Department of Diagnostic Radiology, Graduate School of Biomedical Sciences, Hiroshima University, Kasumi 1-2-3 Minami-ku, 734-8551, Hiroshima, Japan

    Masao Kiguchi & Kazuo Awai

  7. Department of Radiological technologist, Tsuchiya General Hospital, Nakajima-cho 3-30, Naka-ku, 730-8655, Hiroshima, Japan

    Takayuki Oku & Masato Yoshida

Authors
  1. Takanori Masuda
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  2. Yoshinori Funama
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  3. Takeshi Nakaura
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  4. Tomoyasu Sato
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  5. Kotaro Urayama
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  6. Masao Kiguchi
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  7. Takayuki Oku
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  8. Masato Yoshida
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  9. Shinichi Arao
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  10. Atsushi Ono
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  11. Junichi Hiratsuka
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  12. Kazuo Awai
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Contributions

T.M. contributed to the study design, data collection, algorithm construction, image evaluation, and the writing and editing of the article; Y.F. carried out the data collection, image evaluation, and the reviewing and editing of the article; T.N. performed supervision, project administration, image evaluation, and reviewing and editing of the article. All authors read and approved the final manuscript.

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Correspondence to Takanori Masuda.

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This study was phantom study.

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Masuda, T., Funama, Y., Nakaura, T. et al. Usefulness of large beam-shaping filters at different tube voltages of newborn chest CT. Phys Eng Sci Med 46, 289–293 (2023). https://doi.org/10.1007/s13246-023-01217-8

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  • DOI: https://doi.org/10.1007/s13246-023-01217-8

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