Gamma radiation is beamed through the body in which of the scans listed below?

Gamma radiation is a high-energy form of electromagnetic radiation that is utilized in various medical imaging techniques. In the context of the options provided, all listed imaging modalities—Positron Emission Tomography (PET), Computed Tomography (CT) scan, and X-ray—employ principles that involve the interaction of gamma radiation or similar high-energy waves with body tissues to create images.

In a PET scan, gamma radiation is produced when radiolabeled compounds (often involving positron-emitting isotopes) are administered to the patient. The positrons emitted by the radioactive material collide with electrons in the body, resulting in the release of gamma photons. These photons are then detected to form detailed images of metabolic processes.

CT scans, while primarily utilizing X-rays, do involve the detection of high-energy photons as well, particularly during advanced imaging techniques where high doses of radiation are used to provide cross-sectional images of the body.

X-rays are another form of electromagnetic radiation that allow visualization of structures within the body. Although not technically classified as gamma radiation, X-rays operate in a similar energy range and can penetrate tissues to varying degrees, producing images based on the differential absorption of radiation by different types of tissues.

This understanding illustrates that all the imaging techniques listed involve