Radiation dose levels in pediatric chest CT: experience in 499 children evaluated with dual-source single-energy CT
The availability of dual-source technology has introduced the possibility of scanning children at lower kVp with a high-pitch mode, combining high-speed data acquisition and high temporal resolution.
To establish the radiation dose levels of dual-source, single-energy chest CT examinations in children.
Materials and methods
We retrospectively recorded the dose–length product (DLP) of 499 consecutive examinations obtained in children <50 kg, divided into five weight groups: group 1 (<10 kg, n = 129); group 2 (10–20 kg, n = 176); group 3 (20–30 kg, n = 99), group 4 (30–40 kg, n = 58) and group 5 (40–49 kg, n = 37). All CT examinations were performed with high temporal resolution (75 ms), a high-pitch mode and a weight-adapted selection of the milliamperage.
CT examinations were obtained at 80 kVp with a milliamperage ranging between 40 mAs and 90 mAs, and a pitch of 2.0 (n = 162; 32.5%) or 3.0 (n = 337; 67.5%). The mean duration of data acquisition was 522.8 ± 192.0 ms (interquartile range 390 to 610; median 490). In the study population, the mean CT dose index volume (CTDIvol32) was 0.83 mGy (standard deviation [SD] 0.20 mGy; interquartile range 0.72 to 0.94; median 0.78); the mean DLP32 was 21.4 mGy.cm (SD 9.1 mGy.cm; interquartile range 15 to 25; median 19.0); and the mean size-specific dose estimate (SSDE) was 1.7 mGy (SD 0.4 mGy; interquartile range 1.5 to 1.9; median 1.7). The DLP32, CTDIvol32 and SSDE were found to be statistically significant in the five weight categories (P < 0.0001).
This study establishes the radiation dose levels for dual-source, single-kVp chest CT from a single center. In the five weight categories, the median values varied 15–37 mGy.cm for the DLP32, 0.78–1.25 mGy for the CTDIvol32 and 1.6–2.1 mGy for the SSDE.
KeywordsChest Children Computed tomography Dual-source computed tomography Lungs Peak kilovoltage Radiation dose
Compliance with ethical standards
Conflicts of interest
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