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?

A patient is being treated isocentrically for cervical cancer. The patient is in the 3rd week of treatment.  The patient is being treated on a machine that is calibrated at 100 SSD.  The tumor is 9.2 cm below the anterior surface of the patient.  The tumor is also located 10.2 cm medial from the patient’s left side. The patient is 26.4 cm thick (AP/PA) and from right to left lateral the patient is 34.6cm.  The doctor prescribes a total dose of 64.8 Gy to be delivered in fractions of 1.8 Gy.  The patient is being treated using a four field box technique. What is the patient’s right lateral SSD?    

Which statement is false concerning source to axial distance treatment techniques?

Which of the following components of the linear accelerator are not located in the gantry head?

Beam gantry angle and portal shape is mostly determined

Which of the following lymph nodes groups are part of the external iliac node chain? 

All of the following statements about the definition of monitor units is true except