The doctor prescribes an isocentric treatment for a patient with rectal cancer on a linear accelerator calibrated to a distance of 100 SSD. The portal design is such that the posterioanterior portal collimator setting on the secondary collimator is 6.7 cm x 7.3 cm. The tumor isocenter is 5.7 cm from the posterior aspect of the patient. What would be the field size on the patient’s skin? 

At fractionated total doses between 35-40 Gy, all of the following organs will reach their whole organ tissue tolerance dose EXCEPT:

Which of the following is not a functional daily quality assurance procedure for the linear accelerator? 

You have a metastatic brain patient coming to your department to begin whole brain treatments. The doctor orders parallel opposed treatments to depth of midline in the brain. What is the best way to determine depth?

When in the seated position, the body rests on the

Which of the following is illustrated by the #6?

The geometrical point where the radiation beam is created, emerges and then diverges as it travels is called the

Which of the following organs in this male pelvis has the least radioresistance?

Which of the following are the major components of the gantry in the linear accelerator? 

Which of the following primary cancer sites does not demonstrate metastasis to the liver?