Pelvimetry by magnetic resonance imaging.

Sagittal and transverse multisection magnetic resonance imaging (MRI) in 10 patients was used to obtain dimensions of the maternal pelvis, determine fetal position, and examine maternal and fetal soft tissues. Dimensions were measured with less than 1% instrument error, and bony landmarks were readily identified. MR pelvimetry is an accurate technique for obtaining traditional pelvimetric measurements without exposure to ionizing radiation. These techniques can be further used to investigate soft-tissue dystocia and obstructed labor.