Sample Size and Estimation of Standard Radiation Doses for Pediatric Brain CT

Inoue, Yusuke; Itoh, Hiroyasu; Shiibashi, Nao; Sasa, Ryosuke; Mitsui, Kohei

doi:10.3390/tomography8050207

Cited by 4 publications

(2 citation statements)

References 33 publications

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“…It is important to realize that AEC techniques will only reduce doses efficiently as much as the specified/desired image quality allows [62]. We also stress that, when using AEC, the radiation exposure depends on the type of AEC software, the parameters input into the software, and the direction of the localizer images [63]. There are facilities where AEC is not used for head/brain CT, which is actually in the majority of the cases in the above-cited literature.…”

Section: Discussionmentioning

confidence: 99%

Utilisation of 3D Printing in the Manufacturing of an Anthropomorphic Paediatric Head Phantom for the Optimisation of Scanning Parameters in CT

et al. 2023

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Computed tomography (CT) is a diagnostic imaging process that uses ionising radiation to obtain information about the interior anatomic structure of the human body. Considering that the medical use of ionising radiation implies exposing patients to radiation that may lead to unwanted stochastic effects and that those effects are less probable at lower doses, optimising imaging protocols is of great importance. In this paper, we used an assembled 3D-printed infant head phantom and matched its image quality parameters with those obtained for a commercially available adult head phantom using the imaging protocol dedicated for adult patients. In accordance with the results, an optimised scanning protocol was designed which resulted in dose reductions for paediatric patients while keeping image quality at an adequate level.

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Section: Discussionmentioning

confidence: 99%

Utilisation of 3D Printing in the Manufacturing of an Anthropomorphic Paediatric Head Phantom for the Optimisation of Scanning Parameters in CT

et al. 2023

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“…We retrospectively analyzed brain CT scans performed for various clinical indications in children aged <15 years at a single institution. The data were used in previous studies for different purposes [ 17 , 21 , 22 , 23 ]. The ED was not assessed in those studies.…”

Section: Methodsmentioning

confidence: 99%

Age-Dependent Changes in Effective Dose in Pediatric Brain CT: Comparisons of Estimation Methods

Inoue,

Mori,

Itoh

et al. 2023

Tomography

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The effective dose (ED) in computed tomography (CT) may be calculated by multiplying the dose–length product (DLP) by a conversion factor. As children grow, automatic exposure control increases the DLP, while the conversion factor decreases; these two changes affect the ED in opposite ways. The aim of this study was to investigate the methods of ED estimation according to age in pediatric brain CT. We retrospectively analyzed 980 brain CT scans performed for various clinical indications in children. The conversion factor at each age, in integer years, was determined based on the values at 0, 1, 5, and 10 years provided by the International Commission on Radiological Protection (ICRP), using a curve (curve method) or lines (linear method). In the simple method, the ED was estimated using the ICRP conversion factor for the closest age. We also analyzed the ED estimated by a radiation dose management system. Although the median DLP at each age increased with age, the median ED estimated by the curve method was highest at 0 years, decreased with age, and then plateaued at 9 years. The linear method yielded mildly different results, especially at 2 and 3 years. The ED estimated by the simple method or the radiation dose management system showed inconsistent, up-and-down changes with age. In conclusion, the ED in pediatric brain CT decreases with age despite increased DLP. Determination of the conversion factor at each age using a curve is expected to contribute to estimating the ED in pediatric CT according to age.

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Size-Specific Dose Estimates in Pediatric Brain Ct in Relation to Age and Weight

Fujii

Inoue

Itoh

et al. 2023

Radiation Protection Dosimetry

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The size-specific dose estimate (SSDE) is used for radiation dose management in computed tomography (CT) and represents patient’s absorbed dose more accurately than volume CT dose index. The relationship between SSDE and age or weight was investigated using 980 pediatric brain CT scans. Monolinear, power, and bilinear functions were fitted to the plots of SSDE against age or weight, and SSDE was estimated using the obtained functions. SSDE showed a biphasic increase with increasing age and weight: a rapid initial increase and subsequent a slow increase. Bilinear and power functions were successfully fitted to the plots, and mean estimation errors were close to 0, irrespective of the age or weight group. The standard SSDE values estimated from the obtained functions agreed well with the median values for each age or weight group. The curve-fitting method is expected to aid radiation dose management for pediatric brain CT using SSDE.

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Sample Size and Estimation of Standard Radiation Doses for Pediatric Brain CT

Cited by 4 publications

References 33 publications

Utilisation of 3D Printing in the Manufacturing of an Anthropomorphic Paediatric Head Phantom for the Optimisation of Scanning Parameters in CT

Utilisation of 3D Printing in the Manufacturing of an Anthropomorphic Paediatric Head Phantom for the Optimisation of Scanning Parameters in CT

Age-Dependent Changes in Effective Dose in Pediatric Brain CT: Comparisons of Estimation Methods

Size-Specific Dose Estimates in Pediatric Brain Ct in Relation to Age and Weight

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