A patient undergoing CT simulation for abdominal radiation therapy requires clearer identification of bowel loops adjacent to the planned target. Which option BEST addresses this objective?

During CT simulation, a therapist must establish a reference 1.5 cm left of the patient midline. The couch cannot translate laterally. Which action BEST establishes this reference without altering the patient’s straight position?

A therapist is preparing to place lateral reference marks during CT simulation. Which laser system MOST directly assists with side-wall leveling and symmetry?

A CT simulation dataset demonstrates excellent in-plane detail but inadequate visualization of the superior and inferior borders of a small tumor. Which parameter would MOST directly address the remaining limitation?

A patient’s treatment setup appears reproducible, but the approved plan specifies a wedge that is not present in the treatment setup. Which response is BEST?

CT images and RT structure data are transferred separately. The contours do not align with the images. What should be investigated FIRST?

A patient’s sagittal laser line appears correctly aligned with the anterior midline, but the lateral wall references reveal unequal patient height on the two sides. What is the BEST interpretation?

A patient undergoing pelvic CT simulation is documented as head-first prone with a belly board. Which abbreviation BEST matches the documented orientation?

A physician modifies isocenter and beam arrangement during virtual simulation. Which additional information is MOST relevant for evaluating the proposal?

A radiation oncologist outlines a visible oropharyngeal tumor and requests inclusion of adjacent tissue considered at risk for microscopic extension. Which volume represents this additional clinical consideration?