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?

A therapist is told that a treatment field is divided into many small beam components that deliver different intensities. Which additional feature should the therapist MOST expect?

Which normal-tissue benefit is MOST directly associated with the proton Bragg peak?

A patient is scheduled for SBRT to a peripheral lung lesion. The radiation oncologist requests a highly reproducible setup because of the small treatment margins and high dose per fraction. Which device would BEST provide customized immobilization of the patient’s thorax?

Several CT images are missing after transfer to the treatment-planning system, but the tumor is visible in the remaining images. What is MOST appropriate?

A patient receiving radiation therapy to an extremity has difficulty maintaining the same limb position during repeated setup attempts. Which intervention would BEST improve reproducibility?