Why does clinical MRI detect the magnetic resonance signal of water protons in the body?
A. a) Because only water protons have spin.
B. b) Because water has an odd number of neutrons.
C. c) Because water protons are the most abundant spins in the body.
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How much energy is converted into heat by an electron beam in an X-ray tube?
A. 1%
B. 10%
C. 99%
What minimizes the X-ray dose?
A. The faster the X film, the better
By collimating less exposed areas
C. Use lead to protect vulnerable areas
D. With low-energy X-rays
E. B and C
F. A and D
What are the advantages of using fluoroscopy to image swallowed barium meal?
A small movie and a high-resolution still photo are available.
B. The detection system is longer.
C. It is displayed vertically.
In perspective, where is the detection system relative to the patient?
A. Under the patient
B. In front of the patient
C. Behind the patient
D. Relative to the X-ray tube and the patient in the opposite direction
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