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A patient has facial swelling and falling blood pressure shortly after contrast injection. Which assessment is MOST appropriate?

 A patient receiving radiation therapy to the pelvis was simulated supine using a customized Vac-Lok and knee support. At the first treatment, the therapist discovers that the knee support has been replaced with a significantly thicker cushion. What is the MOST important concern?

A planning CT is fused with prostate MRI, but the bladder and rectum boundaries do not align. What should occur BEFORE using MRI for contouring?

A student incorrectly identifies the marked vessel as the IVC. Which anatomic relationship BEST corrects the error?

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?

During CT simulation for a thoracic treatment, the physician requests a sagittal reconstruction to better assess the superior and inferior extent of the target. Which process BEST produces this view?

During CT simulation, a therapist is asked to modify the component that limits the width of the x-ray beam before it enters the patient. Which component is MOST directly responsible?

A patient has several tattoos from an earlier course of radiotherapy and three new marks near the current treatment site. The therapist cannot determine which marks are current. What is the BEST next step?

During a CT simulation, the patient reports nausea shortly after IV contrast injection. What is the BEST response?

During CT simulation, the therapist uses a laser line inside the scanner bore to relate the patient to the imaging reference plane. Which laser system is being used?