The reason for keeping beam shaping devices at least 15 to 20 centimeters from the patient’s skin is that

Extra Credit: Which of the following most accurately defines the characteristics of a Grade 3 tumor?  

The prostate gland is located

When treating a mediastinum with parallel opposed 10 x 15 cm AP/PA portals, which of the following structures is most likely at greatest risk for radiation induced injury?

Extra Credit: The leaf ends of the multileaf collimator produce divergent beam patterns to 

A course of radiation therapy which is intended to relieve the suffering of an individual with no intent to cure is called:                   

The discrepancies in the patient/beam alignment between the first portal image and the simulation DRR may be due to

Which of the following beam energies will exhibit the greatest amount of skin sparing? 

Which of the following is not a use for bolus?

A noticeable skin reaction due to radiation exposures around 30 Gy is