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03.02.2024 | Original Article

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

verfasst von: Takanori Masuda, Masao Kiguchi, Chikako Fujioka, Takayuki Oku, Toru Ishibashi, Yasushi Katsunuma, Takayasu Yoshitake, Shuji Abe, Kazuo Awai

Erschienen in: Pediatric Radiology | Ausgabe 5/2024

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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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Titel: Impact of beam collimation of z-overscanning on dose to the lens and thyroid gland in paediatric thoracic computed tomography imaging
verfasst von: Takanori Masuda
Masao Kiguchi
Chikako Fujioka
Takayuki Oku
Toru Ishibashi
Yasushi Katsunuma
Takayasu Yoshitake
Shuji Abe
Kazuo Awai
Publikationsdatum: 03.02.2024
Verlag: Springer Berlin Heidelberg
Erschienen in: Pediatric Radiology / Ausgabe 5/2024
Print ISSN: 0301-0449
Elektronische ISSN: 1432-1998
DOI: https://doi.org/10.1007/s00247-024-05862-3

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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