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通过对１１例肝癌术后留置门静脉导管患者进行了ＣＯ２肝脏超声造影的研究。结果显示ＣＯ２造影使肝内增强里局限型或弥漫型；肝实质增强持续时间平均大于４２分钟。而肝癌内未见气体增强表现，即呈低回声型，并且较造影前更清晰突出。研究认为肝癌的血供不一定全部都有门静脉血供，并且ＣＯ２门脉造影可作为发现肝癌和监测导管的一种手段。
The CO2 hepatic contrast echocardiography was performed on 11 patients with hepatic portal vein catheters. The results showed that CO2 angiography enhanced intrahepatic enhancement in localized or diffuse types; the duration of liver parenchyma enhancement was greater than 42 minutes on average. However, no enhanced gas performance was observed in liver cancer, ie, it was of hypoechoic type and was more prominent than before the contrast. Studies have shown that blood supply to liver cancer may not always have portal venous blood supply, and CO2 portal angiography may be used as a means of detecting liver cancer and monitoring catheters.