Arijanda Neverauskiene1, Mazena Maciusovic2, Marius Burkanas2, Birute Griciene3, Linas Petkevicius4, Linas Zaleckas5, Algirdas Tamosiunas3, Jonas Venius6. 1. Department of Radiology, Childrens Hospital, Affiliate of Vilnius University Hospital Santaros Klinikos, Vilnius, Lithuania; Department of Radiology, Nuclear Medicine and Medical Physics, Institute of Biomedical Sciences of the Faculty of Medicine of Vilnius University, Vilnius, Lithuania. Electronic address: arijanda.neverauskiene@vuvl.lt. 2. Medical Physics Department, National Cancer Institute, Vilnius, Lithuania. 3. Department of Radiology, Nuclear Medicine and Medical Physics, Institute of Biomedical Sciences of the Faculty of Medicine of Vilnius University, Vilnius, Lithuania. 4. Institute of Computer Science, Vilnius University, Vilnius, Lithuania. 5. Centre of Oral and Maxillofacial Surgery of Vilnius University Hospital Zalgiris Clinic, Institute of Dentistry of the Faculty of Medicine of Vilnius University, Vilnius, Lithuania. 6. Medical Physics Department, National Cancer Institute, Vilnius, Lithuania; Biomedical Physics Laboratory, National Cancer Institute, Vilnius, Lithuania.
Abstract
OBJECTIVES: The aim of this study was to simulate low dose paediatric head CT images with different noise levels corresponding to various tube current time product values and assess simulated image suitability in non-syndromic craniosynostosis diagnostics. METHOD: 29 paediatric patients who underwent head CT examinations for cranial deformity were enrolled in the study. The low dose CT images, corresponding to 120 kV and 120 mAs, 100 mAs, 80 mAs, 50 mAs and 13 mAs settings, were synthesised by adding noise to original data. Three researchers evaluated suitability for diagnostics of original and simulated images by using questionnaire assessing image suitability. RESULT: 174 separate cases (containing 1 axial and 1 3D image) were evaluated. Percentage of images evaluated as suitable for diagnosis were 98.9% on original images, 100% on 120 mAs, 100% on 100 mAs, 97.1% on 80 mAs, 96.6% on 50 mAs and 96% on 13 mAs. CONCLUSIONS: Images registered with 120 kV 13 mAs can be used to diagnose non-syndromic craniosynostosis with statistically same accuracy as with standard protocol and correspond to decrease of effective dose from 4.98 mSv to 0.33 mSv (median values).
OBJECTIVES: The aim of this study was to simulate low dose paediatric head CT images with different noise levels corresponding to various tube current time product values and assess simulated image suitability in non-syndromic craniosynostosis diagnostics. METHOD: 29 paediatric patients who underwent head CT examinations for cranial deformity were enrolled in the study. The low dose CT images, corresponding to 120 kV and 120 mAs, 100 mAs, 80 mAs, 50 mAs and 13 mAs settings, were synthesised by adding noise to original data. Three researchers evaluated suitability for diagnostics of original and simulated images by using questionnaire assessing image suitability. RESULT: 174 separate cases (containing 1 axial and 1 3D image) were evaluated. Percentage of images evaluated as suitable for diagnosis were 98.9% on original images, 100% on 120 mAs, 100% on 100 mAs, 97.1% on 80 mAs, 96.6% on 50 mAs and 96% on 13 mAs. CONCLUSIONS: Images registered with 120 kV 13 mAs can be used to diagnose non-syndromic craniosynostosis with statistically same accuracy as with standard protocol and correspond to decrease of effective dose from 4.98 mSv to 0.33 mSv (median values).
Authors: Jens Borgbjerg; Heidi S Christensen; Rozh Al-Mashhadi; Martin Bøgsted; Jens B Frøkjær; Lise Medrud; Nis Elbrønd Larsen; Jes S Lindholt Journal: Acta Radiol Open Date: 2022-10-12