What device is used by oncologists to detect cancer and how does it work?

It is not hard to fi: There is no single devise that we use, we use a variety of examinations/tests and often a biopsy to confirm if a tumor is cancerous. A medical examination(physical exam) is the first step, followed by appropriate imaging tests(using x-rays and ct/mri scans) to locate a tumor in the body which is then biopsied with a knife or a needle. A miscroscopic exm is then done to look for cancer cells.