Computed tomographic pelvimetry.

Pelvimetry can be performed on a computed tomographic (CT) scanner using anteroposterior and lateral scanned projection radiographs (Scout View) plus a single CT slice through the low pelvis. This technique yields accurate measurements of the maternal pelvis that do not need compensation for magnification. The fetal lie and presentation can be easily assessed, along with the fetal neck for hyperextension. In addition, the total radiation dose to both mother and fetus is significantly lower than with routine plain film pelvimetry. Since the procedure is quick, easy to perform and competitive in cost, CT pelvimetry should be the procedure of choice in those rare instances in which pelvimetry is indicated.