Abstract: To construct the digitalized 3 dimensional(3D) model of the pelvic and abdominal vessels by CTA and MRA original images, and assess the guiding effect on the treatment of placenta implantation, 40 cases patients with placenta implantation pregnant women from January 2018 to January 2019 were selected, and divided into 2 groups according to the random number table. The control group received interventional therapy guided by CTA, and the observation group received interventional surgery guided by MRA. The 3D model of abdominal and pelvic vessels of the two groups were analyzed, and the X-ray radiation dose and contrast agent dosage were calculated. The incidence of postoperative complications was also calculated. Results showed both of the methods could clearly display the third-grade arteriovenous vessels, and reconstruct them completely. CE-MRA was superior to CTA in presacral vein display (P<0.01). The interposition time, exposure time, X-ray radiation, contrast agent dose and contrast agent rate in the observation group were lower than those in the control group (P<0.05). The incidence of complications in the observation group was significantly lower than that in the control group (P<0.01). The digitalized 3 dimensional(3D) model by MRA can clearly display the first to fourth grade arteriovenous vessels, which is more suitable for the interventional treatment of placental implantation.

Key words: magnetic resonance angiography, CT angiography, digital three-dimensional model of abdo-minal and pelvic vessels, placenta implantation