These tests find out the position of the cancer, how big it is and whether it has spread.
You might have a CT scan to find out how big your bowel cancer is, and whether it has spread (the stage).
PET-CT is one of the tests you might have to find out more about your cancer and whether it has spread.
MRI stands for magnetic resonance imaging. It uses magnetism and radio waves to create cross section pictures of the body.
You might have an ultrasound scan if you have cancer in your back passage (rectum).
You might have an ultrasound of your tummy to see if your bowel cancer has spread.