Liver volume will be measure at 3 time points. All patients will undergo CT volumetry at baseline, 4-6 weeks and 8-12 weeks after SIRT. Multiphasic dynamic contrast-enhanced hepatic CT scans are obtained with either a Dual Source CT (Siemens Medical) or Brilliance iCT (Philips Medical System). Scans will be obtained using a standard four phase liver protocol with a multidetector CT system with at least 64-channel detectors. Contrast medium is administered to the patients for acquisition of arterial-phase and portal-venous-phase and equilibrium CT images. The CT scanning parameters included collimation of 0.625-1.2mm. The reconstructed slice thickness for the scans are 0.8 - 1.5 mm and reconstruction intervals of 0.4 - 1 mm. Reconstructed CT slices have a matrix size of 512×512 pixels. The images are then measured using a commercially available 3D software (Vital's Vitrea Advanced CT Liver Oncology package) and manually corrected, reviewed and resected by a single senior radiologist to ensure consistency in following the same anatomical landmarks. The software allows saving of the work performed in order to allow reviewing and rechecking of the final measurements.