Audit about pelvimetry of a polyvalent radiology department

Purpose: Study of the dose absorbed by the fetus during GT pelvimetry. Material and methods: Twenty consecutive pelvimetries on pregnant women sho wed the mean fetal location in regard of the maternal pelvic skeleton (retr ospective study). Then, thermoluminescent radiation detectors were put in t he antropomorph phantom slices, in housing correspondent to the fetal's vol ume. The location of this volume has been determined by the first study. Tw o different CT units were tested. Results : In case of cephalic presentation, the maximum fetal dose was 3 mG y. In case of pelvic presentation, because of an additional frontal topogra m, the dose reached 3,3 to 3,6 mGy. Conclusion : We recommend: 1) reduction of parameters (120kV and 100mAs) fo r "normal" women; using other parameters for larger women; interval follow- up to evaluate results using these parameters; 2) tilting the bisciatic pla ne of section so to avoid direct exposure to the fetus; 3) limitation to 25 cm for the lateral scout; suppression of the routine frontal scout in case of pelvic presentation.