We studied the ability of digital radiographs generated on a computed tomography scanner to replace conventional pelvimetry. Two digital radiographs were usually sufficient to measure the maternal pelvis. The antero-posterior (AP) digital radiograph allowed measurement of the transverse diameter of the pelvic inlet, the interspinous distance and the intertuberous diameter. These three distances were corrected for magnification after reference to the lateral digital radiograph. The lateral radiograph gives the AP diameter of the pelvic inlet and the low sagittal diameter. Dosimetry studies demonstrated that maternal skin doses and fetal gonad doses were very low. Pelvimetry using digital radiography is a simple procedure which offers the advantage of low radiation exposure to both fetus and mother and a high accuracy of measurement.
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