Contrast agents
3 important questions on Contrast agents
Why would you inject a contrast agent?
To make more difference in attenuation. You want to increase the attenuation coefficient at the position of the contrast agent.
High attenuation give a white spot
High attenuation give a white spot
What are two frequently used contrast agents? What are characteristics of these compounds?
- Iodine: for in the blood vessels => angiogram
- Barium: gastro-intestinal examination
High atomic number => high level of attenuation
What kind of image do you get when doing a fluoroscopy? When is this used?
Positive image in stead of the regular negative image.
Used with an angiogram.
Used with an angiogram.
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