Successful Dose Reduction Using Reduced Tube Voltage With Hybrid Iterative Reconstruction in Pediatric Abdominal CT

Area of Science:

• Radiology
• Medical Imaging
• Pediatric CT

Background:

• Pediatric CT scans require careful radiation dose management.
• Low tube voltage protocols and iterative reconstruction techniques are emerging strategies for dose reduction.

Purpose of the Study:

• To evaluate the effectiveness of low tube voltage combined with hybrid iterative reconstruction (HIR) in reducing radiation dose for contrast-enhanced pediatric abdominal CT.
• To assess the impact of these techniques on image quality and diagnostic confidence.

Main Methods:

• 133 pediatric patients underwent CT scans with sequentially reduced doses, comparing standard 120 kVp protocols to optimized low-dose protocols (80-100 kVp).
• Images were reconstructed using filtered back projection (FBP) and four levels of HIR.
• Objective measures (CTDIvol, SSDE) and subjective assessments by blinded readers evaluated image quality and diagnostic confidence.

Main Results:

• A 63% reduction in radiation dose (SSDE) was achieved with optimized low-dose protocols compared to standard protocols.
• HIR significantly reduced artifacts and improved visualization of small structures compared to FBP, with no significant increase in noise.
• Diagnostic confidence improved for solid organ injury and metastatic disease detection.

Conclusions:

• Combining low tube voltage with HIR in pediatric abdominal CT allows for substantial radiation dose reduction.
• This approach provides equivalent or improved subjective image quality and diagnostic confidence, making it a valuable tool for pediatric imaging.