(b) Transcatheter Arterial Embolization: In a normal liver three-fourths of the blood is supplied by portal veins and one-forth by the hepatic artery. However, blood for tissue in the cancered liver depends entirely upon the hepatic artery.
（2）肝動脈栓塞療法：正常的肝臟血流，四分之三由門靜脈供給，四分之一由肝動脈供給，而肝癌組織的血液卻完全仰賴肝動脈。