which imaging technique uses radiation that is emitted from the material being imaged?\nx - ray…

Brief Explanations:

X - ray radiography and CT scans use external X - ray radiation directed at the body. MRI uses a magnetic field and radio waves. Sonography uses sound waves. None of these involve radiation emitted from the material being imaged. In some nuclear medicine imaging techniques (not in the options here), radiation is emitted from the material (radioactive tracer in the body). But among the given options, none use radiation emitted from the material being imaged.

Answer:

None of the above