The physician then injects contrast dye to provide direct visualization of the veins so he or she can map out exactly where the problem is and where to embolize, or block, the vein.

• 然后医师往里面注入造影剂以提供静脉的直观显像，所以他/她可以具体的指出问题在哪，应该在哪里栓塞静脉。