Ultra-low-dose lung multidetector computed tomography in children – Approaching 0.2 millisievert

医学 图像质量 核医学 辐射剂量 图像噪声 有效剂量(辐射) 扫描仪 放射科 计算机断层摄影术 图像(数学) 人工智能 计算机科学
作者
Sebastian Tschauner,Michael Zellner,Sarah Pistorius,Ralph Gnannt,Thomas Schraner,Christian J. Kellenberger
出处
期刊:European Journal of Radiology [Elsevier BV]
卷期号:139: 109699-109699 被引量:8
标识
DOI:10.1016/j.ejrad.2021.109699
摘要

PurposeTo compare objective and subjective parameters in image quality and radiation dose of two MDCTs (helical 64 detector CT vs. axial 256 detector CT) in paediatric lung CT.MethodsRadiation dose and image quality were compared between non-enhanced lung CT from a helical 64-slice multidetector CT (MDCT 1) and a 256-slice scanner (MDCT 2) with axial wide-cone acquisition and using deep learning image reconstruction. In 23 size-matched paediatric studies (age 2–18 years) from each scanner, the radiation exposure, signal-to-noise ratio (SNR), contrast-to-noise ratio (CNR), image sharpness and delineation of small airways were assessed. Subjective image quality was rated by 6 paediatric radiologists.ResultsWhile MDCT 2 provided higher SNR and CNR, subjective image quality was not significantly different between studies from both scanners. Radiation exposure was lower in studies from MDCT 2 (CTDIvol 0.26 ± 0.14 mGy, effective dose 0.23 ± 0.11 mSv) than from MDCT 1 (CTDIvol 0.96 ± 0.52 mGy, effective dose 1.13 ± 0.58 mSv), p < 0.001. Despite lower radiation dose for the scout images, the relative scout-scan-ratio increased from 2.64 ± 1.42 % in MDCT 1 to 6.60 ± 5.03 % in MDCT 2 (p = 0.001).ConclusionsBy using latest scanner technology effective radiation dose can be reduced to 0.1−0.3 mSv for lung CT in children without compromising image quality. Scout image dose increasingly accounts for substantial portions of the total scan dose and needs to be optimized. In children CT should be performed on state-of-the-art MDCT scanners with size-adapted exposure protocols and iterative reconstruction.
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