There is no clinical or experimental evidence of terato-genic or other adverse fetal effects from MRI in pregnancy, and the technique is thus well suited for imaging of pregnant women for maternal or fetal reasons (Fig. 12).
MR pelvimetry is indicated in pregnant women with a history of pelvic trauma, previous cesarean section, or in women who desire a trial of labor when the fetus is in breech presentation. The use of X-ray pelvimetry has decreased steadily in recent years. MRI offers the benefit of accurate measurement of the maternal pelvic dimensions without exposure to ionizing radiation.
More recently, technical advances in ultrafast MRI have revolutionized our ability to image the fetus. MRI is most likely to become an important tool for intrauterine fetal imaging as an operator-independent supplement to prenatal ultrasound in the near future.
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