CT Perfusion Scans in Detecting Changes in Blood Flow to the Liver After Portal Vein Embolization

Inclusion Criteria: * Patients planned to undergo major liver resection for cancer who need PVE to increase the size of the FLR prior to surgery. * Patients who are able to understand and give consent to participate in the study. Exclusion Criteria: * Pregnant or nursing. * Allergy to iodinated contrast which cannot be safely pre-medicated. * History of severe renal dysfunction (glomerular filtration rate \[GFR\] \< 30 mL/min/1.73 square meters). Patients with a GFR between 30-50 mL/min/1.73 square meters will receive the standard contrast-induced nephropathy prophylaxis at our institution (i.e. N-acetylcysteine and sodium bicarbonate \[150 mEq/L\] in D5W intravenous).