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Impact of beam collimation of z-overscanning on dose to the lens and thyroid gland in paediatric thoracic computed tomography imaging

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Abstract

Background

Adaptive collimation reduces the dose deposited outside the imaged volume along the z-axis. An increase in the dose deposited outside the imaged volume (to the lens and thyroid) in the z-axis direction is a concern in paediatric computed tomography (CT).

Objective

To compare the dose deposited outside the imaged volume (to the lens and thyroid) between 40-mm and 80-mm collimation during thoracic paediatric helical CT.

Materials and methods

We used anthropomorphic phantoms of newborns and 5-year-olds with 40-mm and 80-mm collimation during helical CT. We compared the measured dose deposited outside the imaged volume using optically stimulated luminescence dosimeters (OSLD) at the surfaces of the lens and thyroid and the image noise between the 40-mm and 80-mm collimations.

Results

There were significant differences in the dose deposited outside the imaged volume (to the lens and thyroid) between the 40-mm and 80-mm collimations for both phantoms (P < 0.01).

Conclusion

Compared with that observed for 80-mm collimation in helical CT scans of the paediatric thorax, the dose deposited outside the imaged volume (to the lens and thyroid) was significantly lower in newborns and 5-year-olds with 40-mm collimation.

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Data availability

All data is available in the Supplementary Material.

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Funding

This work was supported in part by an Academic Research Grant (2021–2022) from the Japanese Society of Radiological Technology.

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Authors and Affiliations

  1. Department of Radiological Technology, Faculty of Health Science and Technology, Kawasaki University of Medical Welfare, Matsushima, Kurashiki, Okayama, 288701-0193, Japan

    Takanori Masuda

  2. Department of Radiology, Hiroshima University, Hiroshima, Japan

    Masao Kiguchi & Chikako Fujioka

  3. Department of Radiological Technologist, Tsuchiya General Hospital, Hiroshima, Japan

    Takayuki Oku & Toru Ishibashi

  4. Department of Radiological Technology, Tokai University Oiso Hospital, Kanagawa, Japan

    Yasushi Katsunuma

  5. TOWCAR WORKS Co., Ltd, Oita, Japan

    Takayasu Yoshitake

  6. Department of Radiological Technology, Osaka College of High Technology, Osaka, Japan

    Shuji Abe

  7. Department of Diagnostic Radiology, Hiroshima University, Hiroshima, Japan

    Kazuo Awai

Authors
  1. Takanori Masuda
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  2. Masao Kiguchi
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  3. Chikako Fujioka
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  4. Takayuki Oku
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  7. Takayasu Yoshitake
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  8. Shuji Abe
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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; M.K., C.F., T.O., and T.I. carried out the data collection, image evaluation, and the reviewing and editing of the article; Y.K., T.Y., and S.A. performed supervision, project administration, image evaluation, and reviewing and editing of the article. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Takanori Masuda.

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Masuda, T., Kiguchi, M., Fujioka, C. et al. Impact of beam collimation of z-overscanning on dose to the lens and thyroid gland in paediatric thoracic computed tomography imaging. Pediatr Radiol 54, 758–763 (2024). https://doi.org/10.1007/s00247-024-05862-3

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  • DOI: https://doi.org/10.1007/s00247-024-05862-3

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