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CT Scan
A CT (computed tomography) scan uses X-rays and a computer to build detailed cross-section images of the body. It is fast and very useful for many conditions, using more radiation than a plain X-ray.
Causes & risk factors
- To look at the brain after injury or stroke symptoms
- To investigate the chest, tummy or pelvis in detail
- To find or stage cancers
- To assess injuries after an accident
- To look for blood clots or bleeding
- To guide biopsies and other procedures
Common symptoms
- Unexplained tummy pain
- Severe or sudden headache
- Chest pain (in some cases)
- Injury after an accident
Tests & diagnosis
- How X-rays work
- MRI (no radiation, different strengths)
- Ultrasound as an alternative in some cases
Treatment & management
- You lie still on a table that moves through a ring-shaped scanner
- It is quick, often just a few minutes
- A contrast dye may be given by injection to show detail
- It uses more radiation than a plain X-ray, but is carefully justified
- Tell staff if you are or might be pregnant, or have kidney problems or allergies
When to see a doctor urgently
- When your doctor needs detailed images of an organ or injury
- To investigate or stage a suspected cancer
- In an emergency, such as suspected stroke or serious injury
Frequently asked questions
Is a CT scan dangerous because of radiation?
A CT uses more radiation than a plain X-ray, but the dose is kept as low as possible and is only used when the benefit outweighs the small risk. Your doctor weighs this before requesting one.
What is the contrast dye for?
Contrast dye highlights blood vessels and certain tissues, making problems easier to see. It is generally safe, but tell staff about any allergies or kidney problems beforehand.
Explore more
Sources & further reading
- World Health Organization (WHO)
- MedlinePlus — U.S. National Library of Medicine
- Ministry of Health & Family Welfare, India
- Indian Council of Medical Research (ICMR)
Reviewed by Dr. Sanjay Anbu, MBBS. MedDroid is an AI medical assistant and can make mistakes. It provides general health information, not a diagnosis or medical advice — always consult a qualified clinician. In an emergency, contact your local emergency number immediately.