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Recommendation for reducing the crystalline lens exposure dose by reducing imaging field width in cone-beam computed tomography for image-guided radiation therapy: an anthropomorphic phantom study

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A Correction to this article was published on 15 May 2024

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Abstract

In cone-beam computed tomography (CBCT) for image-guided radiation therapy (IGRT) of the head, we evaluated the exposure dose reduction effect to the crystalline lens and position-matching accuracy by narrowing one side (X2) of the X-ray aperture (blade) in the X-direction. We defined the ocular surface dose of the head phantom as the crystalline lens exposure dose and measured using a radiophotoluminescence dosimeter (RPLD, GD-352 M) in the preset field (13.6 cm) and in each of the fields when blade X2 aperture was reduced in 0.5 cm increments from 10.0 to 5.0 cm. Auto-bone matching was performed on CBCT images acquired five times with blade X2 aperture set to 13.6 cm and 5.0 cm at each position when the head phantom was moved from − 5.0 to + 5.0 mm in 1.0 mm increment. The maximum reduction rate in the crystalline lens exposure dose was − 38.7% for the right lens and − 13.2% for the left lens when blade X2 aperture was 5.0 cm. The maximum difference in the amount of position correction between blade X2 aperture of 13.6 cm and 5.0 cm was 1 mm, and the accuracy of auto-bone matching was similar. In CBCT of the head, reduced blade X2 aperture is a useful technique for reducing the crystalline lens exposure dose while ensuring the accuracy of position matching.

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Author notes

  1. Koji Sasaki, Tomoki Hayakawa, Toshiyuki Kawadai, Takako Shibasaki, Yoshiyuki Kawasaki are contributed equally to this work.

Authors and Affiliations

  1. Department of Radiology, Koritsu Tatebayashi Kosei General Hospital, Gunma, Japan

    Tatsuya Yoshida, Tomoki Hayakawa, Toshiyuki Kawadai & Takako Shibasaki

  2. Graduate School of Radiological Technology, Gunma Prefectural College of Health Sciences, Gunma, Japan

    Tatsuya Yoshida & Koji Sasaki

  3. Department of Radiology, Nippon Medical School Hospital, Tokyo, Japan

    Yoshiyuki Kawasaki

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  1. Tatsuya Yoshida
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Correspondence to Tatsuya Yoshida.

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The original online version of this article was revised to delete duplicate reference numbers of 5, 7, 8, 10, 11, 13, 23, 25, 26, 28 cited in the text.

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Yoshida, T., Sasaki, K., Hayakawa, T. et al. Recommendation for reducing the crystalline lens exposure dose by reducing imaging field width in cone-beam computed tomography for image-guided radiation therapy: an anthropomorphic phantom study. Radiol Phys Technol (2024). https://doi.org/10.1007/s12194-024-00810-0

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