Methods of Fetal MRI

Abstract

Fetal magnetic resonance imaging (MRI) differs in many respects from a postnatal MRI study. The operator has no influence on the position of the fetus, only by proper positioning and repositioning of the surface coil, and/or the pregnant woman, may optimal imaging conditions be achieved. Without using sedation, fetal movements and positional changes make fetal MRI a sort of interactive imaging, with the goal being to acquire a series of continuous, correctly oriented images as quickly as possible. As structures to be imaged are very small, high-quality images are essential for depicting detailed anatomy and pathology. Therefore, a balance between resolution, field of view, slice thickness, and acquisition time must be found. In addition to T2-weighted sequences, several ultrafast sequences are now available that can provide additional information about specific organs or pathologies.