Doppler ultrasound can be used to display
A. Fetal heart beat
B. Rear artifacts
C. Blood flow
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The echogenicity of fetal bones can be considered
A. Echoless
B. Low echo
C. Hyperechoic
The intensity of the ultrasonic beam will be reduced by which of the following effects?
Absorption
B. Scattering
C. Reflection
D. All of the above
In a DWI brain image of a stroke patient, ischemic brain tissue will appear to have:
A. ) decreased signal compared to healthy tissue.
B. ) increased signal compared to healthy tissue.
C. ) no difference in signal compared to healthy tissue.
Superconducting wire is used in MRI magnet construction because:
A. ) it is stronger than copper wire.
B. ) its resistance is 0 at 0 degrees C and can carry high current.
C. ) its resistance is 0 at 4K and produces very stable magnetic fields.
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