Conventional chemoembolization using Lipiodol-based regimens was introduced in the 1980s, and it is currently recommended as the primary treatment modality for patients with unresectable, intermediate, or locally advanced hepatocellular carcinoma (HCC) by the international guidelines. For better therapeutic efficacy and safety, chemoembolization should be performed as selectively as possible through tumor-feeding arteries, based on the detection of arterial supply to the HCC. With the technical advancement of flat-panel detector, cone-beam computed tomography (CBCT) is mounted on the C-arm of the angiographic machine. CBCT facilitates the detection of small occult HCCs and fine tumor-feeding arteries, recognition of extrahepatic collateral supply, navigation of a microcatheter to the target feeding arteries, prevention of non-target embolization, and intraprocedural assessment of the completeness of treatment with chemoembolization. These functions performed by CBCT ultimately improve the safety and efficacy of chemoembolization and may contribute to improving the prognosis of the patient with HCC.
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