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Unenhanced 320-row multidetector computed tomography of the brain in children: comparison of image quality and radiation dose among wide-volume, one-shot volume, and helical scan modes

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Abstract

Background

The 320-row multidetector computed tomography (CT) scanner has multiple scan modes, including volumetric modes.

Objective

To compare the image quality and radiation dose of 320-row CT in three acquisition modes — helical, one-shot volume, and wide-volume scan — at pediatric brain imaging.

Materials and methods

Fifty-seven children underwent unenhanced brain CT using one of three scan modes (helical scan, n=21; one-shot volume scan, n=17; wide-volume scan, n=19). For qualitative analysis, two reviewers evaluated overall image quality and image noise using a 5-point grading system. For quantitative analysis, signal-to-noise ratio, image noise and posterior fossa artifact index were calculated. To measure the radiation dose, adjusted CT dose index per unit volume (CTDIadj) and dose length product (DLP) were compared.

Results

Qualitatively, the wide-volume scan showed significantly less image noise than the helical scan (P=0.009), and less streak artifact than the one-shot volume scan (P=0.001). The helical mode showed significantly lower signal-to-noise ratio, with a higher image noise level compared with the one-shot volume and wide-volume modes (all P<0.05). The CTDIadj and DLP were significantly lower in the one-shot volume and wide-volume modes compared with those in the helical scan mode (all P<0.05).

Conclusion

For pediatric unenhanced brain CT, both the wide-volume and one-shot volume scans reduced radiation dose compared to the helical scan mode, while the wide-volume scan mode showed fewer streak artifacts in the skull vertex and posterior fossa than the one-shot volume scan.

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Authors and Affiliations

  1. Department of Radiology, Seoul National University Children’s Hospital, 101 Daehak-ro, Jongno-gu, Seoul, 03080, Republic of Korea

    Sun Kyung Jeon, Young Hun Choi, Jung-Eun Cheon, Woo Sun Kim, Yeon Jin Cho, Ji Young Ha, Seung Hyun Lee & In-One Kim

  2. Seoul National University College of Medicine, Seoul, Republic of Korea

    Sun Kyung Jeon, Young Hun Choi, Jung-Eun Cheon, Woo Sun Kim, Yeon Jin Cho & In-One Kim

  3. Institute of Radiation Medicine, Seoul National University Medical Research Center, Seoul, Republic of Korea

    Jung-Eun Cheon, Woo Sun Kim & In-One Kim

  4. Toshiba Medical Systems, Seoul, Republic of Korea

    Hyejin Hyun

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  1. Sun Kyung Jeon
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  2. Young Hun Choi
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  3. Jung-Eun Cheon
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Correspondence to Young Hun Choi.

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Jeon, S.K., Choi, Y.H., Cheon, JE. et al. Unenhanced 320-row multidetector computed tomography of the brain in children: comparison of image quality and radiation dose among wide-volume, one-shot volume, and helical scan modes. Pediatr Radiol 48, 594–601 (2018). https://doi.org/10.1007/s00247-017-4060-1

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  • DOI: https://doi.org/10.1007/s00247-017-4060-1

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