PET-CT scanning. This type of scan is a combination of a PET (positron emission tomography) scan and a CT (computed tomography) scan. The CT scan takes a series of X-rays to form 3D pictures of the inside of the body. A PET scan shows how active cells are in different parts of the body. Cancer cells are usually more active than other cells, so they show up on the PET scan. This combined technique is used for cancer staging and diagnosis, particularly the early detection of pancreatic cancer. Filmed at the Cancer Centre at Guy's Hospital, London, UK.
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