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 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 physician wants a CT-based treatment in which MLCs conform each beam to the target, but optimization of varying beamlet intensities is not required. Which technique BEST meets this description?

A patient undergoing radiation therapy to the abdomen is positioned in a customized Alpha Cradle. During setup, the therapist notices that the patient is resting above the molded contours rather than settling completely into them. Which problem is MOST likely?

A plan is described as having dynamic or segmented MLC movement that creates the desired fluence pattern. Which technique is MOST likely?

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

A patient is preparing for hematopoietic stem-cell transplantation. The treatment must address essentially the entire body and requires careful attention to dose uniformity across different body thicknesses. Which technique is indicated?

A patient receiving thoracic radiation therapy is immobilized in a customized Vac-Lok. Surface-guided radiation therapy indicates that the patient’s external surface closely matches the reference surface. Which statement BEST describes the limitation of this finding?

A radiation oncologist wants the prescribed dose tightly conformed around an irregular target adjacent to critical normal tissue. Which feature would make IMRT preferable to 3D-CRT according to the PDF?

A patient is undergoing CT simulation for a small spinal lesion. The therapist decreases reconstructed slice thickness while maintaining the other acquisition parameters. Which combination of effects is MOST likely?