Figure 1:
Images in a 60-year-old man (body mass index, 29.7 kg/m2) with multiple neuroendocrine liver metastases in the liver who was treated twice with conventional TACE at our institution with an interval of 3 months between treatments. Both panels have orientation indicators and show the cone-beam CT (CBCT ) images acquired during closed arc (in red) and open arc (in green) cone-beam CT, respectively, and the corresponding preinterventional T1-weighted MR images (in blue) to visualize the FOV of the entire patient. The left panel shows the geometric motion of the C-arm with the detector as the reference during closed arc cone-beam CT. This geometric setup allowed only a limited movement of the table on the x-axis such that the FOV was centered on the spine rather than on the liver, resulting in a truncated depiction of the liver and some liver tumors being missed entirely (white box on the left panel). The right panel shows the geometric motion of the C-arm during open arc cone-beam CT. This geometric setup opens the rotation arch to the left side of the patient so that the procedure table can be moved left on the x-axis (red arrow on the right panel), allowing for better centering of the FOV on the liver.