Could a simple ultrasound replace contrast CT for tracking liver tumors?

This study explores whether ultrasound images analyzed by a special computer program can accurately measure the size of liver tumors in people with pancreatic or gastrointestinal cancer that has spread to the liver. Participants will have both a routine contrast-enhanced CT scan and two research ultrasounds. The goal is to see if the ultrasound method gives similar results to the CT scan, which could offer a simpler, radiation-free way to track tumor changes over time.