Limiting CT radiation dose in children with craniosynostosis: phantom study using model-based iterative...

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.