Clinical value of contrast-enhanced ultrasound in early diagnosis of hepatocellular carcinoma

Figure 2 Edge detection of a lesion in a typical case. A: Results of arterial phase detection. No significant abnormal enhancement is observed inside the hematoma or at the edge of the capsule during the arterial phase, and arterial bleeding is reduced after embolization; B: Results of portal phase detection, where the contrast agent enters the venous system through capillaries from the arteries, reflecting tissue gaps and microvascular permeability; C: Results of the delayed detection period, during which the contrast agent should gradually clear and abnormal enhancement indicates continuous bleeding or vascular leakage.