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Human Fetal Blood Flow Quantification with Magnetic Resonance Imaging and Motion Compensation
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Evaluating fetal head dimension changes during labor using open magnetic resonance imaging.

Christian Bamberg1, Jan Deprest2, Nikhil Sindhwani2

  • 1Department of Obstetrics, Charité-University Medical Center, Berlin.

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|May 25, 2016
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Summary

During vaginal birth, the fetal skull molds to fit the birth canal. Real-time MRI shows the fetal head elongates and its height decreases during expulsion, aiding delivery.

Keywords:
Deliveryfetal head configurationfetal head moldingmagnetic resonance imaging (MRI)

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Area of Science:

  • Obstetrics and Gynecology
  • Medical Imaging
  • Fetal Biomechanics

Background:

  • Fetal skull molding is crucial for vaginal delivery, enabling the head to adapt to the maternal pelvis.
  • The biomechanics of fetal head adaptation during labor are not fully understood.
  • Real-time visualization of this process can provide novel insights.

Observation:

  • Open magnetic resonance imaging (MRI) was used to observe a human birth in real-time.
  • Cinematic MRI series captured the fetal head's configuration during the second stage of labor.
  • Measurements of the frontooccipital diameter (FOD) and vertex-to-base distance were analyzed frame-by-frame.

Findings:

  • In an occiput anterior position, the fetal frontooccipital diameter (FOD) increased from 10.3 cm to 11.2 cm during expulsion.
  • The distance from the fetal vertex to the skull base decreased from 6.4 cm to 5.6 cm.
  • These changes indicate significant deformation and elongation of the fetal skull during vaginal delivery.

Implications:

  • This study demonstrates the utility of real-time MRI in visualizing the biomechanics of fetal head molding.
  • The findings provide a clearer understanding of fetal head changes during the late second stage of labor.
  • Advanced imaging can help define the dynamic alterations in fetal head dimensions during the birthing process.