A physician requests contrast to identify a highly vascular tumor during CT simulation. Which explanation BEST supports using an intravenous rather than oral route?

A patient with a history of a prior severe reaction to iodinated contrast arrives for contrast-enhanced CT simulation. What is the BEST initial action?

A student observes that air is black and water is near 0 HU on CT. Which additional observation is MOST consistent with CT attenuation principles?

A student recommends megavoltage photons rather than electrons for a very superficial target because photons provide more skin sparing. Why is that reasoning incomplete?

A patient is simulated for a small head-and-neck target. The display field of view is decreased while the reconstruction matrix remains 512 × 512. Which effect is MOST likely?

A radiation therapist identifies an inconsistency between the simulation order and the proposed patient position. Which action falls within the therapist’s professional responsibility?

A therapist obtains CT simulation images that will later be used to create digitally reconstructed radiographs for treatment verification. Which characteristic of the CT dataset is MOST important for producing accurate DRRs?

Which clinical clue MOST strongly distinguishes TBI from localized external-beam techniques?

Which change would MOST likely convert a classic SRS scenario into an SBRT scenario?

Which treatment description should prompt the therapist to think FIRST of proton therapy?