Dosimetry comparison of pelvimetry methods using conventional radiographs and CT

Purpose. To determine the fetal and maternal exposure to radiation by use o f thermoluminescent dosimeters in order to compare conventional and CT-scan X-ray. Materials and methods. Dosimetry was performed with an anthropomorph phanto m. Thermoluminescent dosimeters were positioned on the surface and in the d epth of the phantom. Digital radiography of the pelvis was performed accord ing to a standard technique. CT-scan of the pelvis was performed according to the Buthiau's technique. Results. With CT, the dose reached 0.31 to 4.95 mGy, with a dose of 2.32 mG y for the fetal gonads. With standard technique, the doses reached 0.03 to 0.39 mGy, with a dose of 0.39 mGy for the fetal gonads. Conclusion. With CT the fetus and the mother were exposed to 1/10th of the total dose delivered using conventional Xrays and the dose distribution was more homogenous.