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

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