Pediatric radiation exposure and effective dose reduction during voiding cystourethrography

Area of Science:

• Pediatric radiology
• Medical imaging technology
• Radiation safety

Background:

• Voiding cystourethrography (VCUG) is a common diagnostic procedure in children.
• Radiation exposure is a concern in pediatric imaging.
• Continuous fluoroscopy (CFL) has been the standard method for VCUG.

Purpose of the Study:

• To compare radiation exposure and effective dose in pediatric VCUG using grid-controlled variable-rate pulsed fluoroscopy (GCPFL) versus continuous fluoroscopy (CFL).
• To compare these effective doses with those from radionuclide cystography (RNC).

Main Methods:

• Retrospective study of 145 children (3 days to 8 years) undergoing VCUG with GCPFL or CFL.
• Patients grouped by fluoroscopy unit and abdominal diameter.
• Analysis of variance used to compare radiation exposure and fluoroscopy time.
• Effective doses calculated and compared across modalities.

Main Results:

• GCPFL reduced total radiation exposure at least eight times compared to CFL (P < .001).
• No significant difference in fluoroscopy time between GCPFL and CFL (P > .50).
• Effective doses from GCPFL were ~10x lower than CFL but ~10x higher than RNC.

Conclusions:

• Pediatric VCUG can be safely performed using GCPFL.
• GCPFL delivers significantly lower radiation exposure than conventional CFL.
• GCPFL offers a substantial reduction in radiation dose for pediatric patients.