Radiation Dose Optimization in Pediatric Chest CT: Major Indicators of Dose Exposure in 1695 CT Scans over Seven Years

• Published in: RöFo : Fortschritte auf dem Gebiet der Röntgenstrahlen und der bildgebende Verfahren Vol. 190; no. 12; pp. 1131 - 1140
• Main Authors: Esser, Michael, Hess, Sabine, Teufel, Matthias, Kraus, Mareen Sarah, Schneeweiß, Sven, Gatidis, Sergios, Schaefer, Juergen F, Tsiflikas, Ilias
• Format: Journal Article
• Language: English
• Published: Stuttgart · New York Georg Thieme Verlag KG 01.12.2018
• Subjects: Adolescent; Age Factors; Child; Child, Preschool; Cone-Beam Computed Tomography - instrumentation; Cone-Beam Computed Tomography - methods; Cone-Beam Computed Tomography - trends; Contrast Media - administration & dosage; Equipment Design; Female; Germany; Humans; Image Enhancement - instrumentation; Image Enhancement - methods; Infant; Infant, Newborn; Iohexol - administration & dosage; Iohexol - analogs & derivatives; Iopamidol - administration & dosage; Iopamidol - analogs & derivatives; Male; Multidetector Computed Tomography - instrumentation; Multidetector Computed Tomography - methods; Multidetector Computed Tomography - trends; Pediatric Radiology; Radiation Dosage; Radiation Exposure - statistics & numerical data; Radiography, Thoracic - instrumentation; Radiography, Thoracic - methods; Radiography, Thoracic - trends; Retrospective Studies; Tomography, X-Ray Computed - instrumentation; Tomography, X-Ray Computed - methods; Tomography, X-Ray Computed - trends; Germany; CT-spiral; radiation safety; thorax
• ISSN: 1438-9029; 1438-9010
• DOI: 10.1055/a-0628-7222

Abstract Purpose  To analyze possible influencing factors on radiation exposure in pediatric chest CT using different approaches for radiation dose optimization and to determine major indicators for dose development. Materials and Methods  In this retrospective study at a clinic with maximum care facilities including pediatric radiology, 1695 chest CT examinations in 768 patients (median age: 10 years; range: 2 days to 17.9 years) were analyzed. Volume CT dose indices, effective dose, size-specific dose estimate, automatic dose modulation (AEC), and high-pitch protocols (pitch ≥ 3.0) were evaluated by univariate analysis. The image quality of low-dose examinations was compared to higher dose protocols by non-inferiority testing. Results  Median dose-specific values annually decreased by an average of 12 %. High-pitch mode (n = 414) resulted in lower dose parameters (p < 0.001). In unenhanced CT, AEC delivered higher dose values compared to scans with fixed parameters (p < 0.001). In contrast-enhanced CT, the use of AEC yielded a significantly lower radiation dose only in patients older than 16 years (p = 0.04). In the age group 6 to 15 years, the values were higher (p < 0.001). The diagnostic image quality of low-dose scans was non-inferior to high-dose scans (2.18 vs. 2.14). Conclusion  Radiation dose of chest CT was reduced without loss of image quality in the last decade. High-pitch scanning was an independent factor in this context. Dose reduction by AEC was limited and only relevant for patients over 16 years. Key Points The radiation dose of pediatric chest CT was reduced in the last decade. High-pitch scanning is an independent factor of dose optimization. Dose reduction by AEC is limited and only relevant for older children. Citation Format Esser M, Hess S, Teufel M et al. Radiation Dose Optimization in Pediatric Chest CT: Major Indicators of Dose Exposure in 1695 CT Scans over Seven Years. Fortschr Röntgenstr 2018; 190: 1131 – 1140