Fig. 3

Comparison of blood supply vessels before and after RFA. Note: (a) Color Doppler ultrasound image of the acardiac twin’s blood supply vessels before RFA, with the green box indicating the location of the blood supply vessels; (b) Color Doppler ultrasound image after RFA showing the occlusion of the blood supply vessels, with the green box marking the area where the vessels have disappeared. The images were obtained using standard two-dimensional ultrasound and color Doppler techniques, showing the changes in blood flow before and after RFA