Which of the following does NOT require dietary changes before the examination is performed?

Excluding the upper and central airways, where in the lungs of a normal person is the airway resistance the highest?

A. apices B. middle zone C. bases D. Airway resistance is equal throughout these three lung zones.

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.