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Dose conversion coefficients for interventional procedures.

F W Schultz1, J Zoetelief

  • 1Interfaculty Reactor Institute, Delft University of Technology, Mekelweg 15, NL-2629 JB Delft, The Netherlands. f.w.schultz@tnw.tudelft.nl

Radiation Protection Dosimetry
|February 8, 2006
PubMed
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Estimating patient radiation risk during interventional procedures requires accurate organ dose calculations. This study shows that dose conversion coefficients (DCCs) vary significantly, making literature values unreliable for effective dose estimation.

Area of Science:

  • Medical Physics
  • Radiological Protection
  • Diagnostic Imaging

Background:

  • Effective dose (E) is crucial for assessing stochastic radiation risks in interventional procedures.
  • Organ doses, essential for predicting deterministic effects, cannot be directly measured and are typically derived from quantities like dose-area product (DAP).
  • Dose conversion coefficients (DCCs) are used to estimate organ doses from measurable quantities, but literature values can vary.

Purpose of the Study:

  • To investigate the variability of dose conversion coefficients (DCCs) used in estimating organ doses from patient radiation exposure during interventional procedures.
  • To highlight the risks associated with relying on literature-reported DCCs due to dependence on procedural and equipment parameters.

Main Methods:

  • Utilized Monte Carlo simulations to analyze the dependence of DCCs on various protocol and equipment parameters.

Related Experiment Videos

  • Examined the conversion of dose-area product (DAP) to effective dose (E) for specific interventional procedures.

    • Main Results:

    • Demonstrated that DCCs are significantly influenced by factors such as imaging protocol and equipment specifics.
    • Observed substantial variations in DCCs for nominally identical procedures, such as percutaneous transluminal coronary angioplasty, with reported values differing (e.g., 0.18 vs. 0.27 mSv Gy⁻¹ cm⁻²).

    Conclusions:

    • Directly adopting literature DCC values for effective dose estimation in interventional radiology can be hazardous.
    • Accurate patient-specific dose assessment requires considering the specific procedural and equipment parameters influencing DCCs, rather than relying on generalized values.