In CT exposure, which unit is used to express patient exposure in the provided material?

• A. mrems
• B. RADS
• C. rems
• D. Gy-SV

Answer: (B)

In CT exposure, what matters is how much energy is actually deposited in the patient's tissue, i.e., the absorbed dose. The material you’re studying uses RADS to express this, standing for Radiation Absorbed Dose. That’s why RADS is the best fit here: it directly represents energy deposited per unit mass, the quantity CT dose reporting in that material is referring to.

The other options describe different quantities: millirem and rems are dose equivalents, which account for biological effect rather than the raw energy deposited. Gy-SV isn’t a standard single unit; gray and sievert are separate SI units—gray for absorbed dose and sievert for dose equivalent.