Computed Tomography in Diagnosing Patients With Pancreatic or Hepatobiliary Cancer

Inclusion Criteria: * PANCREATIC CANCER: Histologically confirmed adenocarcinoma of the pancreas * PANCREATIC CANCER: Non-distant metastatic pancreatic cancer that is either * Unresectable locally advanced disease, defined as primary tumor that involves \> 180 degrees of the superior mesenteric artery, celiac axis or any of its branches on CT or MRI, primary tumor that occludes the superior mesenteric vein or portal vein, aorta or inferior vena cava invasion, or superior mesenteric vein invasion below the transverse mesocolon * Borderline resectable disease, defined as primary tumor that involves =\< 180 degrees of the superior mesenteric artery, celiac axis or any of its branches on CT or MRI, primary tumor that involves the superior mesenteric vein causing vein deformity or segmental venous occlusion with a patent vessel above and below suitable for reconstruction, or primary tumor that abuts or encases (\>= 50% of the vessel circumference) a short segment of the common hepatic artery (typically at the gastroduodenal artery origin) * PANCREATIC CANCER: Eastern Cooperative Oncology Group (ECOG) performance status (PS) 0-1 * PANCREATIC CANCER: Women of childbearing potential (those who have not undergone a hysterectomy or who have not been postmenopausal for at least 24 consecutive months) must agree to practice adequate contraception and to refrain from breast feeding * PANCREATIC CANCER: Patient who has been recommended chemotherapy treatment for pancreatic cancer * P…