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Effective doses to patients from paediatric cardiac catheterization
J Rassow1, A A Schmaltz, F Hentrich
1Institute for Medical Radiation Physics, University Hospitals Essen, Germany.
The British Journal of Radiology
|July 8, 2000
Summary
Effective radiation doses from pediatric cardiac catheterization are highest in newborns, despite lower dose-area products, due to age-specific conversion factors. This highlights increased radiation risk for young children undergoing these X-ray procedures.
Area of Science:
- Medical Physics
- Pediatric Cardiology
- Radiology
Background:
- Council Directive 97/43/Euratom mandates dose assessment for pediatric X-ray examinations, particularly those involving high doses.
- Cardiac catheterization and angiocardiography in children frequently involve high radiation doses, necessitating accurate effective dose determination.
- Effective dose is a key metric for assessing radiation-induced risks, such as leukemia, in pediatric patients.
Purpose of the Study:
- To determine effective doses for infants and children undergoing cardiac catheterization.
- To calculate age-specific conversion factors (effective dose/dose-area product) for pediatric cardiac procedures.
- To analyze the frequency distributions of dose-area product and effective doses in relation to patient age.
Main Methods:
- Collected dose-area product measurements and patient records for 2114 children undergoing cardiac catheterization (1984-1996).
- Calculated conversion factors based on posteroanterior (PA) and lateral (Lat) projections, considering X-ray tube voltage, zoom mode, and fluoroscopy/cine-film sequences.
- Stratified calculations across eight pediatric age groups.
Main Results:
- Highest effective doses were observed in newborns (90th percentile: 18.0 mSv; 50th percentile: 6.5 mSv) compared to adolescents (90th percentile: 8.0 mSv; 50th percentile: 3.0 mSv).
- Newborns exhibited the highest effective doses despite having the lowest dose-area products, attributed to lower conversion factors.
- Frequency distributions for dose-area product, examination counts, and effective doses were analyzed across the patient cohort.
Conclusions:
- Effective doses in pediatric cardiac catheterization are significantly higher in newborns than in older children.
- Age-dependent conversion factors are crucial for accurately assessing radiation risk in pediatric cardiac procedures.
- The elevated tumor risk in younger children necessitates careful consideration of effective doses from cardiac catheterization.