A Computerised Tomography (CT) scan or CAT scan uses X-rays to create detailed cross-sectional images of the body. CT scanning is an excellent medical tool used to detect a range of disorders and can be used to scan the majority of body parts. In particular, it may be used to diagnose subtle fractures, tumours, tiny kidney stones, strokes, and narrowing or blockages of arteries. CT can also be used to look at the lungs, major body organs, and bowel.