Question

question 15 of 20
which of these is an advantage of a ct scan over an mri?

a. it produces better images of soft tissue.

b. it uses safer compounds to produce contrast.

c. it uses no radiation.

d. it is more helpful in determining whether surgery is necessary.

Explanation:

• Option A: MRI is better for soft tissue imaging, so A is incorrect.
• Option B: CT scans use contrast agents (like iodine - based) which can have risks, and MRI contrast (like gadolinium - based) also has its own risks. But CT's contrast compounds are not generally considered "safer" overall. However, compared to the other options, this is the most plausible. Wait, no, let's re - evaluate.
• Option C: CT uses X - ray radiation, MRI uses magnetic fields and radio waves (no radiation). So C is incorrect.
• Option D: Both can help in surgical decision - making, and this is not a clear - cut advantage of CT over MRI.

Now, re - checking: CT contrast agents (e.g., iodine) and MRI contrast agents (e.g., gadolinium) have different safety profiles. But among the options, B is the only one that can be considered an advantage in terms of the compounds used (even though the safety is context - dependent, it is the best among the given options). Wait, no, actually, the correct answer is B? Wait, no, let's think again.

Wait, the correct answer is B? Wait, no, let's re - analyze each option:

1. Option A: MRI is superior for soft tissue, so A is wrong.
2. Option B: CT contrast (iodine - based) and MRI contrast (gadolinium - based) have different risks. But in general, the compounds used in CT for contrast are considered to have a different safety profile, and among the options, this is the most valid advantage claim (even if it's a bit simplistic).
3. Option C: CT uses radiation, so C is wrong.
4. Option D: Both can assist in surgical decisions, not a clear CT advantage.

So the correct option is B.

Answer:

B. It uses safer compounds to produce contrast.