Diagnostic Imaging
Educational information. Individual clinical review of this presentation by Dr. Ehsan is not yet documented. It does not replace personal medical evaluation.
Source: MedlinePlus, National Library of Medicine. Read the original source
MedlinePlus data edition September 26, 2026. Imported September 27, 2026. These dates do not indicate a new clinical review of the article.
What is diagnostic imaging?
Diagnostic imaging refers to medical tests that create pictures of the inside of the body. These pictures help your health care provider see your organs, bones, blood vessels, and tissues. Imaging tests can help find the cause of symptoms, detect disease early, monitor an illness or injury, and guide treatment.
What are different types of diagnostic imaging?
Different machines are used to create pictures inside your body. The type of imaging your provider uses depends on your symptoms and the part of your body being checked.
Common types of diagnostic imaging include:
- X-rays
- CT (computed tomography) scans
- Nuclear medicine scans
- MRI (magnetic resonance imaging) scans
- Ultrasound
Why is diagnostic imaging done?
Diagnostic imaging tests help providers understand health problems and make decisions about care.
These tests may be used to:
- Find health problems early
- Learn what causes pain or other symptoms
- Plan treatment
- Monitor a condition or see how well treatment is working
Some imaging tests can also help guide medical procedures, such as placing catheters, stents, or other medical devices inside the body.
How is diagnostic imaging done?
Each diagnostic imaging test is different, but many follow similar steps.
During an imaging test:
- Some tests require you to change clothes or remove metal items, such as jewelry or glasses
- Some tests require you to fast (not eat or drink) or drink contrast material (a substance that helps some parts of your body show up more clearly on the images)
- Many imaging tests take only a short time
- Some tests require you to stay still inside an imaging machine, which may feel uncomfortable
- Some tests use a small amount of radiation
Always tell your provider if you are pregnant or think you may be pregnant.
After most imaging tests, you can return to normal activities right away. A specialist called a radiologist reviews the images and shares the results with your provider.
Symptoms, tests and care options
Further reading selected by MedlinePlus. Links open the original organizations’ websites.
- Echocardiography · National Library of Medicine
Questions for your care team
General prompts to help prepare for your appointment.
- How does this information apply to my situation?
- Which symptoms or results need evaluation?
- Which tests are useful, and what can they tell us?
- What care options, benefits, and risks should we discuss?
- When should I seek urgent help, and whom should I call?
- When is follow-up, and how will we know whether the plan is working?
For a life-threatening emergency, call 911 in the U.S. or your local emergency number.
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