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Related Experiment Videos

Human fetal anatomy: MR imaging.

J C Weinreb, T Lowe, J M Cohen

    Radiology
    |December 1, 1985
    PubMed
    Summary

    Magnetic resonance (MR) imaging can visualize many fetal structures, especially in the third trimester. However, fetal motion often degrades image quality, limiting its current value in prenatal diagnosis.

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    Area of Science:

    • Medical Imaging
    • Obstetrics
    • Fetal Medicine

    Background:

    • Prenatal diagnosis relies on imaging modalities to assess fetal development and health.
    • Magnetic resonance (MR) imaging offers high soft-tissue contrast, potentially aiding in detailed fetal anatomical assessment.

    Purpose of the Study:

    • To evaluate the feasibility and diagnostic utility of low-field (0.35 T) MR imaging for visualizing normal fetal structures.
    • To identify optimal imaging parameters for depicting fetal anatomy and assess the impact of fetal motion.

    Main Methods:

    • Twenty-four pregnant women underwent MR imaging at 0.35 T after sonographic evaluation.
    • Retrospective analysis of 26 fetuses to identify visible structures and assess image quality.
    • Evaluation of imaging parameters, including T1 and T2 weighting, and the effect of maternal sedation.

    Main Results:

    • Fetal motion significantly degraded image quality in most cases, except in oligohydramnios during the third trimester.
    • Many fetal structures were identifiable, particularly in the third trimester, with improved visualization after maternal sedation.
    • T1-weighted images showed less motion artifact and better contrast, while T2 weighting aided in delineating the fetal head and brain.

    Conclusions:

    • Current low-field MR imaging is of limited value for visualizing many fetal structures, especially in early gestation, due to motion artifacts.
    • The fetal head and liver are frequently visualized, suggesting potential for further investigation.
    • The utility of MR imaging for fetal fat assessment warrants additional research.

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