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Human Fetal Blood Flow Quantification with Magnetic Resonance Imaging and Motion Compensation
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Third trimester fetal 4D flow MRI with motion correction.

Reagan M Tompkins1, Takashi Fujiwara2, Eric M Schrauben1

  • 1Department of Radiology & Nuclear Medicine, Amsterdam University Medical Center, University of Amsterdam, Amsterdam, The Netherlands.

Magnetic Resonance in Medicine
|January 10, 2025
PubMed
Summary
This summary is machine-generated.

Maternal and fetal motion in fetal 4D flow MRI was corrected, significantly improving image quality and mass conservation for better diagnostic accuracy. This technique enhances the analysis of fetal cardiovascular health.

Keywords:
4D flowfetal CMRmotion correction

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Area of Science:

  • Medical Imaging
  • Cardiovascular Imaging
  • Fetal MRI

Background:

  • Fetal 4D flow MRI is crucial for assessing fetal cardiovascular health.
  • Maternal breathing and fetal movement introduce significant motion artifacts, compromising image quality and diagnostic accuracy.
  • Existing methods struggle to adequately correct for these complex motion patterns.

Purpose of the Study:

  • To develop and validate a post-hoc motion correction technique for fetal 4D flow MRI.
  • To address artifacts caused by maternal respiratory and fetal bulk motion.
  • To improve the diagnostic utility of fetal 4D flow MRI by enhancing image quality and data reliability.

Main Methods:

  • Implemented a Doppler-ultrasound fetal cardiac-gated free-running 4D flow acquisition protocol.
  • Applied automated post-hoc correction steps for maternal respiratory and fetal bulk motion, with optional manual intervention.
  • Utilized compressed-sensing reconstruction with data outlier rejection, adapted from prior research.
  • Evaluated improvements through qualitative assessment of vasculature visibility, conservation of mass in major vessels, and coefficient of variation of flow.

Main Results:

  • Pre-correction, only 56% of volunteer and 50% of patient acquisitions were suitable for flow analysis.
  • Post-correction, suitability increased to 83%, recovering eight previously failed acquisitions.
  • Significantly improved vasculature visibility in the ductus arteriosus and aortic arch (p < 0.05).
  • Enhanced conservation of mass in key vessels from a median 14% to 5% difference (p = 0.002).

Conclusions:

  • Post-hoc motion correction effectively compensates for maternal and fetal motion in fetal 4D flow MRI.
  • The technique significantly improves image quality and the conservation of mass, crucial for accurate hemodynamic assessment.
  • This advancement enhances the reliability and diagnostic potential of fetal 4D flow MRI for evaluating congenital heart disease and other fetal conditions.