What is the Mayneord Factor for a patient who was originally treated at 100 cm SSD to a depth of 5 cm with a 10MV photon beam, but now needs to be treated at 110 SSD?

A patient is to be treated using a three-field prone pelvis SAD plan.  The lateral fields use wedges.  How many MUs will each lateral field receive if the prescribed dose is 180 cGy per fraction, the fields are equally weighted, have a wedge factor of 0.74, output of 0.90 cGy/MU, and TMR of 0.812?

Which of the following describes where the field size is defined in a non-isocentric approach?

Which of the following are considered when designing fields and beam arrangements?  (Select all that apply)

Which of the following represents the relationship between the dose and the PDD at a point?

The value of TMR is never greater than:

Calculate the percentage of the dose attenuated if the measured dose with the wedge is 95 cGy and the dose without the wedge is 125 cGy.

In calculating dose to points of interest for isocentric problems, What does SCPD mean?

A patient’s prescription requires a total of 180 cGy to be delivered per day to equally weighted to POP fields (Parallel Opposed Ports).  The treatment time to deliver 100 cGy is 2.15 minutes.  What treatment time must be delivered to each field to follow the prescription?

PDD is dependent on which of the following? I.   Energy II.  Depth III. Field size IV. SSD