high-kilovoltage exposure factors are usually reguired for radiographic examinations using:
- 1. water-soluble iodinated media
- 2. anegative contrast agent
- 3. barium sulfate
- a. 1 only
- b. 3 only
- c. 1 and 2 only
- d. 1,2 and 3
The correct answer is a. 1 only.
Here's why:
- Water-soluble iodinated media:
These contrast agents absorb X-rays more effectively than body tissues, requiring higher kilovoltage (kV) to penetrate and achieve optimal contrast on radiographs. Examples include iohexol, iopamidol, and gadolinium-based contrast agents.
- Negative contrast agent:
This type of agent, like air or barium gas, creates a dark space on the radiograph by displacing other tissues. They typically don't require high kV as they rely on the inherent difference in X-ray absorption between the agent and surrounding tissues.
- Barium sulfate:
This is a positive contrast agent, meaning it appears white on the radiograph due to its high atomic number. Like negative contrast agents, it doesn't necessitate high kV due to its inherent X-ray absorption properties.
Therefore, only water-soluble iodinated media typically require high-kilovoltage exposure factors for radiographic examinations.
