![]() The most frequently detected MRI signs of PAS for both 1.5-T and 3.0-T groups were placental heterogeneity ( n = 85, 93.5% vs. Interobserver agreement was excellent for both groups. MRI showed excellent predictive ability for detecting extrauterine placental spread with 100% sensitivity (95% CI: 89.4–100.0), 96.7% specificity (95% CI: 88.1–99.6) for 1.5-T and 97% sensitivity (95% CI: 84.2–99.9), 96.7% specificity (95% CI: 88.1–99.6) for 3.0-T without differences between the two groups ( P > 0.999). One hundred-eighty-two gravid women were included in the study of these, 91/182 (50%) women were evaluated with 1.5-T (mean age, 35 ± 5.1 years mean gestational age: 32.5 weeks) and 91/182 (50%) with 3.0-T MRI (mean age, 34.9 ± 4.9 years mean gestational age, 32.1 weeks).
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