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High Frequency Ultrasound for the Analysis of Fetal and Placental Development In Vivo
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Quantifying Molecular Changes in the Preeclamptic Rat Placenta with Targeted Contrast-Enhanced Ultrasound Imaging
Lili Shi1, Allan K N Alencar1, Kenneth F Swan2
1Department of Biomedical Engineering, Tulane University, 500 Lindy Boggs Center, New Orleans, LA, 70118, USA.
Molecular Imaging and Biology
|February 27, 2025
Summary
This study introduces a bicompartmental model (BCM) to analyze placental vascular changes using targeted contrast-enhanced ultrasound (T-CEUS). The BCM method shows promise for early detection and monitoring of preeclampsia (PE) by identifying abnormal placental development.
Area of Science:
- Obstetrics and Gynecology
- Medical Imaging
- Biomedical Engineering
Background:
- Abnormal placental remodeling is a key factor in pregnancy complications like preeclampsia (PE).
- Current methods for assessing placental vasculature may lack the resolution to detect subtle molecular changes.
- Targeted contrast-enhanced ultrasound (T-CEUS) offers potential for non-invasive imaging of placental development.
Purpose of the Study:
- To apply a bicompartmental model (BCM) for quantifying molecular expression changes in the placenta indicative of abnormal remodeling.
- To evaluate the effectiveness of T-CEUS in detecting abnormal placental vasculature associated with PE.
- To assess the BCM model's ability to differentiate placental artery structures.
Main Methods:
- Utilized a targeted contrast agent (TCA) with microbubbles targeting αvβ3 integrin, a marker for angiogenesis.
- Acquired CEUS images from Sprague Dawley rats with experimentally-induced placental insufficiency (RUPP model) and normal pregnant (NP) controls.
- Applied the BCM model to estimate TCA binding dynamics and generate parametric maps of the binding constant (k_on).
Main Results:
- The RUPP group exhibited a significant reduction in the binding constant (k_on) compared to the NP group (p < 0.05).
- The BCM model demonstrated higher contrast-to-background ratios in differentiating placental artery structures compared to differential target enhancement (dTE) and late enhancement (LE) methods.
- Histograms of placental k_on values effectively distinguished between placental groups.
Conclusions:
- The BCM method successfully differentiates molecular changes linked to abnormal placental development in a PE model.
- BCM analysis reveals intricate placental internal anatomical structures more effectively than dTE and LE.
- This suggests BCM-enhanced T-CEUS could improve early detection and monitoring of preeclampsia.
