Computed tomography (CT) scan is a useful diagnostic tool for detecting diseases and injuries. It uses a series of X-rays and a computer to produce a 3D image of soft tissues and bones. CT is a painless, quick, non-invasive way for your healthcare provider to diagnose conditions. CT scans may be performed to help diagnose tumours, investigate internal bleeding, or check for other internal injuries or damage. CT can also be used for a tissue or fluid biopsy.