What is the patient’s IFD if the depth from the AP is 9 cm., and the depth from PA is 11 cm.?

The main difference between an isocentric and a non-isocentric set up is that for an isocentric setup, the TSDs will be the same regardless of the gantry angle.

The dose using a blocking tray is 97 cGy and the dose without the tray is 100 cGy.  The tray transmission factor is:

Determine the dose to the kidney at a depth of 7 cm. for a single field abdominal patient using a 12 cm. x 12 cm. field size and an 18 MV beam.  The tumor dose is 250 cGy and the PDD is .865.

Calculate the dose at 10 cm. if the dose at Dmax is 300 cGy per day using a 6 MV beam for an ES of 16.4 cm.2.

Calculate the effective field size for a port that measures 16 cm. x 12 cm. with 2 small blocked areas, one measuring 2 cm. x 3 cm. and the other measuring 3 cm. x 5 cm.

The hand-calculated equivalent square of a rectangular field of 20 cm. x 10 cm. is ______ cm.: (show work)

Calculate the gap at the skin surface for 2 fields that abut at a depth of 5 cm. using a 100 cm. The superior field size is 10 cm. x 13 cm. and the inferior field size is 9 cm. x 35 cm.

Sc represents (check all that apply):

Determine the PDD for a patient being treated with a 6 MV beam at a depth of 6 cm. using an ES of 10.9.