Which statement about the differences between medical imaging using x-rays and a nuclear medicine scan using gamma rays is correct?
- an x-ray procedure leaves the patient with residual radioactivity while nuclear medicine does not.
- a gamma ray source can be switched off after which no gamma radiation is produced while an x-ray source will continue to produce radiation until the source decays.
- x-rays produce an image of internal anatomy while a nuclear medicine scan provides information about the functioning of an organ or tissue.
- a beam of gamma rays is fired at the patient and detected on the other side, while x-rays are produced by the nucleus of a radionuclide incorporated in the patient’s body.
Medicine
C: X-rays that pass through the body without being absorbed by the body are used to produce an image of internal structure. In nuclear medicine, a radioactive material is incorporated into the body, travels to certain organs from where a gamma ray is emitted. If physiology is altered sufficiently to affect the way the radioactive material moves about the body, the resulting image provides information about how much alteration there has been.
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