[Organ dose and conversion coefficients applied to gonads and uterus in enteroclysis with double contrast technique]
G M Weiner1, B Köhler, W Golder
1Klinik und Poliklinik für Radiologie und Nuklearmedizin, Charité - Universitätsmedizin Berlin, Campus Benjamin Franklin. guido.weimer@medizin.fu-berlin.de
Purpose:
Conversion coefficients are commonly used to estimate the radiation dose in projectional radiography from the dose-area product (DAP). This study investigates whether conversion coefficients can also be used for dosimetry in fluoroscopic procedures.
Materials And Methods:
Thermoluminescence dosimeters (TLD) were placed into an anthropomorphic phantom (Alderson Rando Phantom) to measure the dose absorbed by the gonads and uterus. A standardized enteroclysis in double contrast technique (Sellink/Herlinger) was simulated and the DAP was measured. Three examinations with 70, 80 and 90 kV were carried out with a fluoroscopy time of 15 minutes each. The relations between the DAP and the organ dose were analyzed and a linear regression was performed to determine the conversion coefficients [mSv/cGycm (2)].
Results:
The DAP and the organ dose measured by TLD were strongly correlated (r > 0.95) for all examined organs.
Conclusion:
The strong correlations between TLD-measured organ doses and DAP recommend the use of conversion coefficients for the dosimetry of fluoroscopic procedures.
