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MedlinePlus is a service of the National Library of Medicine (NLM), the world's largest medical library, which is part of the National Institutes of Health (NIH). It was built as an online health information resource for patients and their families and friends.

MedlinePlus presents high-quality, easy to understand, relevant health and wellness information that is trusted.

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X-Rays - National Library of Medicine

X-rays are a type of radiation called electromagnetic waves. X-ray imaging creates pictures of the inside of your body. The images show the parts of your ...

Angina - National Library of Medicine

Angina is chest pain or discomfort you feel when there is not enough blood flow to your heart muscle. Your heart muscle needs the oxygen that the blood carries. ...

Heart Health Tests - National Library of Medicine

... bloodstream to your heart. Then your doctor takes x-rays of your heart. The dye allows your doctor to see your coronary arteries on the x-ray, and to check for coronary artery disease ( ...

Mammography - National Library of Medicine

What is a mammogram? A mammogram is an x-ray picture of the breast. Health care providers ... a mammogram, you stand in front of an x-ray machine. The person who takes the x- ...

Radiation Exposure - National Library of Medicine

... light Ionizing radiation, which includes ultraviolet radiation, radon, x-rays, and gamma rays What are the sources ... sun. Other sources are man-made, such as x-rays, radiation therapy to treat cancer, and electrical ...

CT Scans - National Library of Medicine

... is a type of imaging. It uses special x-ray equipment to make cross-sectional pictures of ... slowly passes through the center of a large X-ray machine. The test is painless. During some ...