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Questions and Answers
What is the classification of contrast media based on their appearance in radiography?
What does osmolality refer to in the context of contrast media?
Which type of contrast media has molecules that remain whole in solution and are termed nonionic?
What is used exclusively for radiography of the GI tract and can be administered either orally or rectally?
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Which substance is included in the classification of negative (radiolucent) contrast media?
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Study Notes
Classification of Contrast Media
- Contrast media are classified based on their radiographic appearance as:
- Positive (radiopaque) contrast media, which absorb X-rays and appear white on images
- Negative (radiolucent) contrast media, which allow X-rays to pass through and appear black on images
Osmolality of Contrast Media
- Osmolality refers to the concentration of particles in a solution that can affect the osmotic pressure
- High-osmolality contrast media have a high concentration of particles, which can cause dehydration and other adverse effects
- Low-osmolality contrast media have a lower concentration of particles, reducing the risk of adverse effects
Ionic and Nonionic Contrast Media
- Ionic contrast media have molecules that dissociate in solution into ions, which can cause adverse effects
- Nonionic contrast media have molecules that remain whole in solution, reducing the risk of adverse effects
- Examples of nonionic contrast media include iohexol and iopamidol
Contrast Media for GI Tract Radiography
- Barium sulfate is used exclusively for radiography of the GI tract
- Barium sulfate can be administered either orally or rectally
- It is a positive (radiopaque) contrast medium that outlines the GI tract on radiographic images
Negative Contrast Media
- Air is an example of a negative (radiolucent) contrast medium
- It is used to visualize the GI tract and other structures on radiographic images
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Description
Learn about contrast media and its classification into neutral, negative, and positive types. Understand the concept of osmolality and its significance in contrast media.
