4. Catheter positioning. A superselective (i.e., segmental or subsegmental) approach should be used whenever possible by using a microcatheter. Use of 3D / MPR obtained from C-arm rotational angiography with a flat-panel detector system (cone-beam CT) is recommended, if available, to improve the accuracy in identifying tumor-feeding arteries. Such imaging allows for accurate targeting of the tumor. In addition, repeat cone beam CT should be performed after successful delivery of the DC Bead to confirm adequate targeting and saturation of the tumor(s).