What is the term for the introduction of radioactive materials into the body for single-plane imaging?

The correct choice is the introduction of radioactive materials into the body for the purpose of single-plane imaging, which is referred to as planar nuclear medicine imaging. This technique involves using a gamma camera to capture a two-dimensional image of the distribution of radioactive tracers within the body.

In planar nuclear medicine imaging, the emitted gamma rays from the radioactive materials are detected and used to create images that reflect physiological and anatomical processes. This is crucial in diagnosing various medical conditions, as it allows for the visualization of metabolism and blood flow in specific organs.

The other choices refer to different processes or methodologies within the field of radiology or nuclear medicine. Nuclear imaging therapy focuses on treatment using radioactive substances rather than imaging. Radioactive emission monitoring is related to tracking radioactivity in general rather than producing specific images for diagnostic purposes. Single-plane radiology suggests a broader radiologic methodology that might not specifically involve radioactive materials or imaging techniques exclusive to nuclear medicine. Thus, planar nuclear medicine imaging is the precise term for the intended action described in the question.