**2.2 Technical characteristics of SBRT in hepatocellular carcinoma**

After correct immobilization of the patient, a planning CT scan is performed. The patient will be placed in supine decubitus position with the arms behind the head, avoiding that they remain in the entrance of the treatment beams. For the correct acquisition of the image, it is essential to know the contrast uptake times of each of the lesions and the need or not to use oral contrast when the stomach is close to the treatment field.

The CT image for hepatic SBRT will be acquired with intravenous contrast. The way of acquiring the contrast varies according to the location and type of tumor. The most commonly used contrast in MRI is gadolinium; however, there



#### **Table 1.**

*Retrospective and prospective studies of hepatocellular carcinoma SBRT.*
