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[Body structure and radiation exposure in dynamic X-ray studies. A contribution to determining national reference
1Klinik für Radiologie und Nuklearmedizin, Klinikum Benjamin Franklin, Freie Universität Berlin. golder@cipmail-ukbf.fu-berlin.de
Purpose:
To contribute data on radiation exposure in dynamic X-ray procedures and to compare them with anthropometric parameters.
Methods:
50 venographies of the lower extremity, 51 abdominal arteriographies, and 121 double contrast examinations of the small bowel were carried out and the dose-area product (DAP) measured for each of the procedures. Additionally, fluoroscopy time, number of shots, body height, body weight, and the sagittal diameter of the examined region were recorded. Dose measurements were statistically evaluated and the following data determined: Frequency distribution, mean, median, 25%- and 75 percentiles as well as correlations with sex, body weight, and diameters.
Results:
Median DAP was 587 (men: 540; women: 636) cGycm2 with venography of the lower extremities. DAP/min was better correlated with body weight (r = 0.663) than with diameters of the thigh (r = 0.611). Mean DAP was 14,869 (18,070; 10,980) cGycm2 with abdominal arteriography. DAP/min was badly correlated both with body weight (r = 0.285) and diameters of the abdomen (r = 0.249). Mean DAP was 4527 (5096; 4114) cGycm2 with enteroclysis. DAP/min was well correlated with both body weight (r = 0.621) and diameters of the abdomen (r = 0.628).
Conclusion:
DAP of venography of the lower extremity and enteroclysis is greatly influenced by the constitution of the patient. The differences between men and women are, however, not as striking as with static X-ray procedures. By contrast, in abdominal arteriography body weight and diameter play a limited role for radiation exposure.