To explore the value of two dimentional colour Doppler flow image (2D-CDFI) combined with three-dimensional color power angiography (3D-CPA) in diagnosis of placenta accreta.

A total of 43 pregnant women at risk of placenta accreta selected from September 2010 to August 2015 were enrolled, and underwent 2D-CDFI and 3D-CPA to scan entire placenta. Taking the results of clinical outcome and delivery pathology of the placenta as standard, the ultrasound characteristics of 2D-CDFI and 3D-CPA were analyzed.

Taking the results of clinical outcome and delivery pathology of the placenta as standard, 24 were proved with placenta increta, 3 patients with adherent placenta, 2 patients with placenta percreta, 14 patients with no placenta implantation. Out of 43 cases, 29 cases displayed the placental thickening and rich blood vessels in placenta, and at interface of placenta and bladder wall in 2D-CDFI. For 2D-CDFI, 19 cases were correctly diagnosed with placenta accrete, while 6 cases were mis-diagnosed and 4 cases missed diagnosed, the diagnosis coincidence rate by 2D-CDFI was 65.5% (19/29). The ultrasound characteristics displayed irregular arranged myometrial arcuate artery, rich blood vessels at interface of placenta and bladder wall in 3D-CPA. For 3D-CPA, 23 cases were correctly diagnosed with placenta accrete, 3 cases were misdiagnosed, the diagnosis coincidence rate by 3D-CPA was 79.3% (23/29). For 3D-CPA combined 2D-CDFI, 1 case missed diagnosed, the diagnosis coincidence rate by combination 2D-CDFI with 3D-CPA was 96.6% (28/29).

Placenta accrete can all be prenatally diagnosed by characteristic ultrasonic features of 2D-CDFI and 3D-CPA. But 3D-CPA can clearly display the range of placenta accrete lesions and the depth of the blood vessels diffused, has more advantage than two-gray scale ultrasound and 2D-CDFI and has broad application in clinic.