The patient’s original treatment plan was to midplane for an AP/PA spine treatment.  However, the radiation oncologist decided to make a 3 cm posterior isocenter shift.  What is the new SSD if the patient’s separation is 24 cm?

A partial arc treatment will rotate 220 degrees for the daily treatment of 180 cGy.  The MU setting is 191.  Calculate the gantry speed.

The annual dose equivalent limit to the heart for occupationally exposed individuals is ____ mSv.

If the dose rate is 250 cGy/min at 100 cm from the source, what is the dose rate at 140 cm from the source?

Calculate the collimator rotation required for a lateral brain field of a CSI treatment with the following parameters:brain field length = 19 cmbrain SAD = 100spine field length = 32 cmspine SSD = 110

Regarding the multiple beam alignment check, which of the following are general causes of beam misalignment? I.      Focal spot displacement II.     asymmetry of collimator jaws III.    Displacement in the collimotor rotation axis or the gantry rotation axis  

Varying the beam size and shape utilizing multi-leaf collimators during treatment is known as which of the following?

What is BEV? 

To interact by photoelectric effect, the interacting photon must have energy:

A port film is taken at 130 cm from the source.  The irradiated field measures 16 x 16 cm on the imager.  What does this field size measure at the isocenter?