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Limiting CT radiation dose in children with craniosynostosis: phantom study using model-based iterative
Touko Kaasalainen1, Kirsi Palmu, Anniina Lampinen
1HUS Medical Imaging Center, Radiology, University of Helsinki and Helsinki University Hospital, POB 340, Haartmaninkatu 4, 00290, Helsinki, Finland, touko.kaasalainen@hus.fi.
Insights
Ultra-low-dose CT scans for craniosynostosis imaging significantly reduce radiation exposure in children. Advanced reconstruction techniques maintain adequate image quality, making CT scans safer for pediatric patients requiring multiple imaging studies.
Area of Science:
- Medical imaging
- Pediatric radiology
- Radiation dose reduction
Background:
- Children requiring multiple CT scans, such as those with craniosynostosis, necessitate cautious protocol development.
- Minimizing radiation exposure in pediatric patients is a critical concern in medical imaging.
Purpose of the Study:
- To assess the effectiveness of ultra-low-dose CT protocols combined with model-based iterative reconstruction for craniosynostosis imaging.
- To evaluate the diagnostic image quality achievable with reduced radiation doses in pediatric head imaging.
Main Methods:
- Two pediatric anthropomorphic phantoms were scanned using a 64-slice CT scanner with various low-dose craniosynostosis protocols.
- Organ doses were measured using MOSFET dosimeters, and numerical simulations estimated organ and effective doses.
- Image quality was assessed using adaptive statistical iterative reconstruction (ASiR) and Veo techniques, analyzing noise and contrast.
Main Results:
- Ultra-low-dose settings reduced mean organ dose by up to 83% in the newborn phantom and 88% in the 5-year phantom compared to routine protocols.
- Numerical simulations corroborated the MOSFET measurements, confirming significant radiation dose reduction.
- Image quality remained diagnostically adequate with Veo reconstruction, even at the lowest radiation dose levels.
Conclusions:
- CT imaging for craniosynostosis can be performed using model-based iterative reconstruction at an effective dose of 20 μSv.
- This effective dose is comparable to that of plain skull radiography.
- The proposed ultra-low-dose CT protocols do not compromise the necessary image quality for craniosynostosis assessment.
Background:
Medical professionals need to exercise particular caution when developing CT scanning protocols for children who require multiple CT studies, such as those with craniosynostosis.
Objective:
To evaluate the utility of ultra-low-dose CT protocols with model-based iterative reconstruction techniques for craniosynostosis imaging.
Materials And Methods:
We scanned two pediatric anthropomorphic phantoms with a 64-slice CT scanner using different low-dose protocols for craniosynostosis. We measured organ doses in the head region with metal-oxide-semiconductor field-effect transistor (MOSFET) dosimeters. Numerical simulations served to estimate organ and effective doses. We objectively and subjectively evaluated the quality of images produced by adaptive statistical iterative reconstruction (ASiR) 30%, ASiR 50% and Veo (all by GE Healthcare, Waukesha, WI). Image noise and contrast were determined for different tissues.
Results:
Mean organ dose with the newborn phantom was decreased up to 83% compared to the routine protocol when using ultra-low-dose scanning settings. Similarly, for the 5-year phantom the greatest radiation dose reduction was 88%. The numerical simulations supported the findings with MOSFET measurements. The image quality remained adequate with Veo reconstruction, even at the lowest dose level.
Conclusion:
Craniosynostosis CT with model-based iterative reconstruction could be performed with a 20-μSv effective dose, corresponding to the radiation exposure of plain skull radiography, without compromising required image quality.
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