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Biological dosimetry after extensive diagnostic x-ray exposure
Health Physics
|February 1, 1995
Summary
High chromosome aberration yields were found in patients with extensive diagnostic x-ray exposure. This indicates high equivalent whole body doses, with contributions from contrast media and CT scans discussed.
Area of Science:
- Medical Physics
- Radiation Biology
- Genetics
Background:
- Diagnostic x-rays can lead to radiation exposure.
- Chromosome aberrations serve as biomarkers for radiation dose.
- Previous studies have established dose-response relationships for radiation-induced aberrations.
Purpose of the Study:
- To quantify chromosome aberration yields in patients with significant diagnostic x-ray exposure.
- To estimate equivalent whole body doses using biological dosimetry.
- To discuss the influence of iodized contrast media and computed tomography on these dose estimations.
Main Methods:
- Analysis of chromosome aberrations (dicentric and ring chromosomes) in peripheral blood lymphocytes.
- Application of biological dosimetry techniques to estimate radiation doses.
- Review of patient exposure histories, including diagnostic x-rays, contrast media, and CT scans.
Main Results:
- Significantly elevated yields of dicentric and ring chromosomes were observed in all five patients.
- The determined aberration yields corresponded to high equivalent whole body doses.
- The study provides data on individual patient responses to diagnostic radiation exposure.
Conclusions:
- Extensive diagnostic x-ray exposure can result in substantial biological doses.
- Biological dosimetry is a valuable tool for assessing radiation exposure from medical imaging.
- Further investigation is needed to precisely quantify the contribution of specific procedures like CT and contrast media to the overall biological dose.