Contrast dye
Contrast Dye
Contrast dye (pronunciation: /ˈkɒntrɑːst daɪ/), also known as contrast media or contrast agent, is a substance used to enhance the contrast of structures or fluids within the body in medical imaging.
Etymology
The term "contrast" originates from the Latin word 'contra stare', meaning 'to stand against'. The term "dye" is derived from the Old English 'deah' or 'deag', which means to color or stain.
Usage
Contrast dyes are used in various types of medical imaging procedures such as CT scans, MRI scans, and X-rays. They help to distinguish or "contrast" selected areas of the body from surrounding tissue, providing a clearer image for diagnosis.
Types
There are several types of contrast dyes used in medical imaging. These include:
- Iodine-based contrast dyes: These are used in CT scans and X-rays. They are usually given intravenously.
- Gadolinium-based contrast dyes: These are used in MRI scans. They are also usually given intravenously.
- Barium-sulfate contrast dyes: These are used in X-rays of the digestive system. They are usually swallowed or given as an enema.
Risks and Side Effects
While contrast dyes are generally safe, they can cause side effects in some people. These can range from mild reactions like nausea and itching to more serious reactions like anaphylaxis. People with kidney problems or allergies to contrast dye are at higher risk of complications.
Related Terms
External links
- Medical encyclopedia article on Contrast dye
- Wikipedia's article - Contrast dye
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