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Two methods for calculating cumulative cancer risk from multiple CT scans were compared. Method A overestimates risk, while Method B is more accurate, though differences are small for tumor incidence and mortality.

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Area of Science:

  • Radiology and Imaging
  • Radiation Oncology
  • Biostatistics

Background:

  • Multiple computed tomography (CT) scans increase cumulative radiation exposure.
  • Accurate estimation of lifetime attributable risk (LAR) of cancer from multiple CTs is crucial for patient safety.
  • Existing methods for calculating cumulative risk require careful evaluation.

Purpose of the Study:

  • To compare the summing method (A) and the complement method (B) for calculating cumulative lifetime-attributable-risk (LAR(tot)) of tumor incidence and mortality from multiple CT exposures.
  • To assess the accuracy and differences between the two methods using simulations and a patient database.

Main Methods:

  • Method A: Summation of individual exposure risks.
  • Method B: Complement of the probability of no cancer induction across N exposures.
  • Risk estimation based on dose, gender, and age at exposure (BEIR VII phase 2).
  • Comparison via simulation and application to a database of 11,884 patients.

Main Results:

  • Method A consistently overestimates LAR(tot).
  • The relative difference (ΔP%) between methods is proportional to dose per exposure and number of exposures.
  • Differences between methods were small: average LAR(tot) for tumor incidence was 0.140% (A) vs. 0.139% (B); for mortality, both averaged 0.085%.
  • Maximum ΔP% observed was 2.43% for a young female patient with high cumulative dose.

Conclusions:

  • While Method B is more accurate for cumulative cancer risk from multiple CTs, both methods provide comparable estimates.
  • Results should be interpreted considering uncertainties in cancer risk models (factor of 2-3).
  • Both methods are viable for estimating cumulative risk, aiding clinical decision-making and patient counseling.