When treating breast cancer, what is the most radiosensitive organ at risk?

Beam shaping using multi-leaf collimators

A radiation therapist is tattooing a patient in the simulation room and she accidentally sticks herself with a contaminated needle. This is a ______________ transmission.

The common iliac nodes drain all of the following structures except the

Hard wedges will have an affect on dose distribution by 

The thick end of a hard wedge

The skin sparing effect will be highest for

The inferior mediastinal lymph nodes are located 

A doctor prescribes a non-isocentric treatment to a patient’s thoracic spine on a linear accelerator that is calibrated to 100 cm.  The patient is being treated in an AP/PA set up, where the treatment dose is prescribed to the depth of the spine, which is 3.7 cm from the posterior aspect of the patient. The total dose prescribed is 4000 cGy for 10 fractions.  The portal size for the AP is 5 cm x 12 cm and the portal for the PA is 5.3 cm x 11.7 cm. The patient AP/PA separation is 23.1 cm.  What would be the equivalent square for the PA portal when calculating the monitor unit for this portal? 

Intensity modulated radiation therapy