The Volume of T2 Low-Signal Band and the Width of the Widest Blood Vessel in Placenta Measured by MRI in Pregnant Women with Different Types of Placental Implantation and Its Differential Value

Objective: To explore the value of magnetic resonance imaging (MRI) in measuring the volume of T2 low-signal band and the width change of the widest blood vessel in placenta in pregnant women with different types of placenta implantation (PI).

Methods: From November 2020 to August 2021, 116 patients in our hospital who underwent placental MRI because of ultrasound or clinical suspicion of PI were selected as the research object. According to the "gold standard" (clinical or surgical pathological results), 79 cases with PI were diagnosed as PI group, and 37 cases without PI were no PI group. The clinical features, MRI signs, T2 hyposignal zone volume, and the width of the widest blood vessel in placenta were compared between the two groups and different types of PI patients. Logistic regression was used to analyze the influencing factors of PI and PI classification, and the receiver-operating characteristic (ROC) was used to analyze the value of T2 low-signal zone volume and the widest blood vessel width in the placenta for different types of PI.

Results: The history of cesarean section, uneven placental signal, the proportion of T2 low-signal band shadow, the volume of T2 low-signal band, and the width of the widest blood vessel in placenta in PI group were higher than those in non-PI group ( < 0.05); the history of cesarean section, uneven placental signal, T2 hypointense band shadow, the volume of T2 hypointense band, and the increase of the width of the widest blood vessel in placenta are independent risk factors for PI ( < 0.05); with the increase of implantation depth, the proportion of T2 hypointense band shadow, the volume of T2 hypointense band, and the width of the widest blood vessel in placenta gradually increased ( < 0.05); T2 hypointense band shadow, T2 hypointense band volume, and the widest blood vessel width in placenta are all influencing factors of PI classification ( < 0.05); ROC showed that the volume of T2 low-signal band and the width of the widest blood vessel in placenta, the AUC of combined identification of adhesive PI, implanted PI, implanted PI, and penetrating PI were 0.846 and 0.899, respectively, which was higher than that of single identification ( < 0.05).

Conclusion: MRI measurement of T2 hyposignal zone volume and the widest blood vessel width in placenta can be used for PI diagnosis and classification differentiation and provide reliable basis for clinical prenatal preparation and treatment planning.