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Pediatric patient surface doses in neuroangiography
Natalie A Swoboda1, Derek G Armstrong, John Smith
1Medical and Health Physics Program, McMaster University, Hamilton, ON, Canada.
Pediatric Radiology
|May 27, 2005
Summary
Pediatric neuroangiography doses were below deterministic effect thresholds, with interventional procedures showing higher radiation exposure. Digital subtraction angiography (DSA) significantly contributed to the overall surface dose in pediatric patients.
Area of Science:
- Medical Imaging
- Radiology
- Pediatric Interventional Radiology
Background:
- Neuroangiographic procedures can involve significant radiation exposure.
- High entrance skin doses are a concern in pediatric neuroangiography due to fluoroscopy and digital subtraction angiography (DSA).
Purpose of the Study:
- To quantify entrance surface doses in pediatric patients undergoing neuroangiography.
- To compare pediatric doses with deterministic effect thresholds and adult data.
- To analyze dose contributions from DSA and fluoroscopy in diagnostic and interventional procedures.
Main Methods:
- Retrospective analysis of 100 pediatric patients undergoing neuroangiographic procedures.
- Utilized a neurobiplane unit with an automated patient dosimeter to measure maximum surface dose.
- Recorded fluoroscopy time and DSA frame counts for dose correlation.
Main Results:
- Mean surface doses from fluoroscopy ranged from 40.9 to 68.1 mGy; DSA doses ranged from 126.9 to 924.4 mGy.
- Digital subtraction angiography (DSA) accounted for 82% of the total procedural surface dose.
- Interventional procedures resulted in consistently higher radiation doses compared to diagnostic procedures.
Conclusions:
- Measured surface doses in pediatric neuroangiography were below thresholds for deterministic effects.
- Interventional neuroangiographic procedures are associated with the highest radiation doses.
- Understanding dose distribution is crucial for optimizing pediatric neuroangiographic protocols.