Glossary term · Tests & reports
CT scan (also: Computed tomography, CAT scan): A CT scan is an imaging test that uses X-ray equipment and a computer to create cross-sectional pictures of the inside of the body.
A CT scan, or computed tomography, uses special X-ray equipment to make detailed cross-sectional pictures of the body, like slices. MedlinePlus says images can also be combined into 3D views. CT is used to diagnose, plan and monitor many conditions, including cancer, fractures and blood clots. Specialists in India usually want the original CT files, not only the report.
How is a CT scan done?
You lie on a table that moves through a ring-shaped machine. The X-ray tube rotates around you. MedlinePlus says the test is painless and usually takes a few minutes, though some scans take up to 30.
What is contrast?
Some scans use contrast to make certain parts show up more clearly. It may be swallowed, injected or given another way. Tell the team about allergies and kidney problems. Drinking fluids afterwards helps your body clear it.
What about radiation?
MedlinePlus says CT uses ionising radiation at higher levels than a standard X-ray, but the dose is kept as low as possible. Tell the team if you are or might be pregnant.
What can CT show?
- Tumours and masses, and whether cancer may have spread.
- Fractures and spinal conditions.
- Blood clots and signs of heart disease.
- Lung disease.
- Internal bleeding or injury.
Sending a CT for review
Send the full study as DICOM files plus the radiologist’s report. Note the date and whether contrast was used.
Questions people ask
How recent should my CT scan be?
It depends on the condition and the question the specialist needs to answer. Ask the reviewing specialist before repeating a scan at home, because they may prefer to scan in India.
Is CT the same as PET-CT?
No. A CT shows structure. A PET-CT combines a CT with a PET scan that uses a radioactive tracer to show activity in tissues. Your specialist decides which you need.
Sources
General information, not medical or legal advice. Rules change: confirm with the official source. Your treating specialist decides on suitability, treatment and length of stay. How we write and check.