Buy Medical Imaging with X-Radiation Discussion

Buy Medical Imaging with X-Radiation Discussion
Buy Medical Imaging with X-Radiation Discussion
1. Which statement about the differences between medical imaging using x-rays
and a nuclear medicine scan using gamma rays is correct?
A. An x-ray procedure leaves the patient with residual radioactivity while
nuclear medicine does not.
B. 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.
C. X-rays produce an image of internal anatomy while a nuclear medicine scan
provides information about the functioning of an organ or tissue.
D. 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.
Buy Medical Imaging with X-Radiation Discussion
2. Conventional radiography – such as a chest x-ray (CXR) – differs from computed tomography (CT) in what respect?
A. CT produces an image of all internal anatomy, while in CXR, overlying anatomical structures obscure the view of underlying structures.
B. In CT the patient is left with some residual radioactivity, but not with CXR.
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C. CT produces a lower absorbed dose of radiation to the patient than does a
CXR.
D. CT involves the use of ultrasound while a CXR results from x-rays.
 
3. Which of the following imaging modalities does NOT involve the use of “ionising radiation”?
A. Mammography
B. Ultrasound
C. A scintigram using technetium
D. A chest x-ray
4. When inspecting an x-ray image, the order of densities from blackest to whitest
is:
A. Bone, water, fat, air
B. Air, fat, water, bone
C. Air, water, fat, bone
D. Bone, air, water, fat
5. Which of the following imaging modalities uses x-rays?
A. Computed tomography (CT)
B. Single-photon emission computed tomography (SPECT)
C. Positron emission tomography (PET)
D. Nuclear medicine scan (scintigram)
6. Radiation which is “ionising” includes which of the following?
A. X-rays and gamma rays
B. Infrared radiation
C. Radiation emitted by mobile phones
D. Microwaves
7. The lead aprons that are used for protection of staff in diagnostic radiography
procedures do not provide protection against the ionising radiation used in
nuclear medicine or radiotherapy. Why is this? Because:
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A. Charged particles are much easier to stop (are less penetrating) than photons
are.
B. Gamma rays are more penetrating than x-rays even if both have the same
energy.
C. Such aprons do not cover the arms, feet, head and neck.
D. The shielding provided by aprons is not sufficient to stop photons with energies above 100 keV.
8. When compared to visible light, which is not very penetrating, why can radiation
such as x-rays and gamma rays pass right through the human body? Because:
A. The density of the human body is relatively low.
B. They have no mass and no charge.
C. Atoms in the body are mostly empty space.
D. They have very high energy.
9. Which of the following is true?
A. A patient exposed to diagnostic x-rays will emit x-rays for a short time after
the procedure.
B. A cancer patient treated with a megavoltage beam of x-rays will emit x-rays
for a short time after the treatment.
C. For a short time after having a bone scan using the radionuclide technetium
99 m, the patient will emit gamma rays.
D. The human body does not contain any radioactive material unless it has been
exposed to man-made radioactive material.
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