Answer the following statement(s) true (T) or false (F)

1. Contrast medium is used to make anatomical structures within the body, not normally visible on an image, become visible.
2. Contrast medium does not cause allergic reactions.
3. Water-soluble iodinated contrast agents are more viscous than fat-soluble iodinated contrast agents.
4. The higher the atomic number of a tissue (bone), the more radiation absorption.
5. Barium, with an atomic number or Z of 56, is a negative contrast agent.

1. TRUE Contrast medium allows for radiographic visualization and is used for various examinations.
2. FALSE The RT must be aware of the allergic reactions caused by the contrast media used in radiography to provide appropriate patient care.
3. FALSE Water-soluble iodinated contrasts agents easily dissolve in water and are less viscous than fat-soluble iodinated contrast agents.
4. TRUE The greater the atomic number of tissue results in the structure appearing lighter on a visible image.
5. FALSE Barium sulfate is a positive contrast agent and is used for visualization of the digestive system.