Tubal iodine-oil angiography is performed by injecting a contrast medium into the uterine cavity and fallopian tubes through a catheter, which is then visualized under X-ray and photographed. Based on the visualization of the contrast medium in the fallopian tubes and the uterine cavity, it is possible to see if the tubes are open, where the obstruction is, and the shape of the uterine cavity. Its a relatively minor procedure, so the patient’s doctor routinely sterilizes the vulva and vagina before the procedure. Also, the vagina is propped open with a vaginal dilator. The doctor can put the uterine catheter inside the cervical canal, and then push the contrast agent through the uterine catheter into the uterine cavity, the contrast agent will slowly flow into the fallopian tube, the doctor can take a picture outside to see the contrast agent in the fallopian tube and pelvis inside the dispersion, so as to be able to know whether the fallopian tube is open or not.