3T MRI Detects Placental Dysfunction in Growth-Restricted Pregnancies, Suggests Study

Affecting 5–10% of pregnancies globally, intrauterine growth restriction (IUGR) is a leading cause of perinatal morbidity. Because conventional ultrasound often fails to quantify specific microvascular placental changes, researchers Priyanka Chandra Sekhar (Sri Ramachandra Institute) and D. S. J. Chaitanya Deep (Sri Venkateswara Medical College) utilized 3T MRI to establish population-specific biomarkers for placental dysfunction in an Indian cohort.

Therefore, in the three-year prospective case-control study, 60 pregnant women between 20 and 38 weeks of gestation were evaluated, comparing 30 growth-restricted cases with 30 healthy controls. Researchers utilized 3 Tesla (3T) MRI anatomical, diffusion-weighted imaging (DWI), and arterial spin labeling (ASL) sequences to quantify placental health, excluding participants with fetal anomalies or MRI contraindications.

Key Clinical Findings of the Study Includes:

• Microstructural Decline: The study demonstrated that placental ADC values were significantly diminished in the IUGR group at 1.83 ± 0.10 × 10⁻³ mm²/s compared to the control average of 2.02 ± 0.10 × 10⁻³ mm²/s, suggesting decreased water diffusion due to stromal fibrosis (p=0.001).

• Impaired Perfusion: Quantitative assessment of blood flow showed that placental perfusion was markedly lower in growth-restricted cases, measuring 102.5 ± 18.7 ml/100 g/min versus 120.2 ± 23.7 ml/100 g/min in healthy pregnancies, likely reflecting inadequate spiral artery remodeling (p=0.002).

• Physiological Signature: These reductions in diffusion and perfusion metrics provide a distinct imaging-based signature of chronic placental hypoxia and vascular failure that often goes undetected by traditional Doppler indices.

• Excellent Reproducibility: The findings highlighted the high clinical utility of these parameters, reporting a strong inter-observer agreement with an intraclass correlation coefficient (ICC) of 0.8, which confirms the reliability of 3 T MRI for quantitative monitoring.

The results suggest that significantly lower placental ADC and perfusion values exist in IUGR compared to normal pregnancies, with these reductions serving as a physiological mirror of the underlying microstructural and vascular abnormalities that define placental insufficiency.

These findings indicate that functional 3 T MRI could be integrated into clinical workflows as a powerful supplemental tool to ultrasound for enhancing the monitoring and risk stratification of high-risk pregnancies.

While the findings are promising, this single-center pilot study is limited by its sample size, underscoring the need for larger, multicenter longitudinal research to establish normative reference datasets and correlate these metrics with long-term neonatal health outcomes.

Reference

Sekhar PC, Chaitanya Deep DSJ. Placental ADC and perfusion in IUGR: insights from 3 T MRI in an Indian cohort. Egypt J Radiol Nucl Med. 2025;56:222.