An IR That Is Large Enough to Extend at Least

Multiple Choice

An IR that is large enough to extend at least 1 inch (2.5 cm) beyond the elbow and wrist joints for a forearm projection is

A) needed to record the elbow and wrist on the image.
B) needed so the beam can be tightly collimated.
C) not a required positioning procedure.
D) needed only when a joint problem is suspected.