For Select Examinations,air (Negative Contrast)and Radiopaque Contrast Are Used as a Pair

Multiple Choice

For select examinations,air (negative contrast) and radiopaque contrast are used as a pair to outline mucosal linings,joint interspaces,and passageways.These examinations are considered

A) double-contrast studies.
B) extremely dangerous and rarely done.
C) single-contrast examinations.
D) low-contrast studies.