Interventional cardiovascular procedures in Belgium: effective dose and conversion factors
E Bogaert1, K Bacher, H Thierens
1Department of Medical Physics and Radiation Protection, University of Ghent, Proeftuinstraat 86, B-9000 Gent, Belgium. evelien.bogaert@ugent.be
Radiation Protection Dosimetry
|April 4, 2008
Summary
Effective dose (E) estimation using conversion factors (CF) varied significantly across Belgian hospitals. Hospital-specific CFs were calculated, with filtration availability being a key factor, not irradiation geometry.
Area of Science:
- Medical Physics
- Radiological Protection
- Interventional Cardiology
Background:
- Effective dose (E) estimation is crucial for assessing risks from late radiation-induced effects.
- Conversion factors (CF) are used to convert measurable quantities like dose-area-product into effective dose.
- Standardized methods for E estimation are needed across healthcare facilities.
Purpose of the Study:
- To compare effective dose (E) values and calculate hospital-specific conversion factors (CF) across eight Belgian hospitals.
- To identify factors influencing E-values and CF in diagnostic and therapeutic procedures.
- To assess the impact of filtration and irradiation geometry on CF variations.
Main Methods:
- Utilized PCXMC software to calculate E-values from dose-area-product data for 318 procedures across eight hospitals.
- Compared E-values between hospitals, considering factors like filtration, training center status, cardiologist actions, and procedure complexity.
- Calculated hospital-specific CFs and an average CF, analyzing correlations and statistical significance.
Main Results:
- Significant variations in E-values were observed between hospitals (P < 0.001).
- Factors influencing E-values included hospital, filtration insertion, training center status, cardiologist dose awareness, and procedure complexity (all P < 0.001).
- An average CF of 0.185 mSv Gycm(-2) was obtained with high correlation (r = 0.966, P < 0.001); differences were mainly due to filtration availability, not irradiation geometry.
Conclusions:
- Effective dose estimation and conversion factors show significant inter-hospital variability.
- Additional filtration, particularly in cinegraphy mode, is a primary driver of CF differences, not variations in irradiation geometry.
- Hospital-specific CFs and attention to filtration are essential for accurate radiological risk assessment in interventional procedures.
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