超星 - 专业英语自测

单选题

The output of a fluoroscopic unit is 10 mR/min at 50 cm. The output at 75 cm is ____ mR/mm.

A. 15.0
B. 7.5
C. 6.6
D. 4.4

单选题

In order to double the quantity of a beam of X-ray, which one of the following approaches is NOT correct?

A. Double the exposure time.
B. Double the tube current.
C. Double the tube voltage.
D. Increase 15% of the tube voltage.

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单选题

Inverse Square Law is useful in radiography because it indicates how the radiation intensity is affected by ___.

A. radioactive decay
B. distance from the source
C. the size of the source
D. none of the above

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单选题

According to the inverse square law, if the radiology technician stands twice as far away from the x-ray tube, she will _ her dose of scatter radiation by__.

A. decrease, 2
B. decrease, 4
C. increase, 2
D. increase, 4

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单选题

Which technique will give the highest patient dose under the same 90 kVp?

A. 400 mA @ 0.04 sec
B. 400 mA @ 0.02 sec
C. 200 mA @0.02 sec
D. 300 mA @ 0.1 sec

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单选题

A radiographic exposure of the chest was taken at 72 inches using 20 mAs and had an exposure of 100 mR. What would the exposure roughly be at 80 inches under the same exposure parameters?

A. 40
B. 60
C. 80
D. 100

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单选题

If one lead apron attenuates 95% of an x-ray beam, two aprons will transmit approximately ____.

A. 5
B. 2.5
C. 1.25
D. 0.25

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单选题

A grid improves the quality of a diagnostic x-ray primarily by attenuating ___.

A. Primary photons
B. Compton scattered photons
C. Photoelectrons
D. Coherent scattered photons

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单选题

The quality of a diagnostic x-ray beam is determined by measuring the _____.

A. Peak tube voltage.
B. Effective kV of the beam.
C. The mm of Al filtration added to the beam.
D. The half-value layer in Al.

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单选题

For 100 KeV X-ray beam, linear attenuation coefficients of aluminum and lead are 0.459and 62.244/cm. What is the thickness of lead in mm equivalent to 15 mm of aluminumin ?

A. 0.01mm
B. 0.11mm
C. 1.1mm
D. 11mm

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The output of a fluoroscopic unit is 10 mR/min at 50 cm. The output at 75 cm is ____ mR/mm.

In order to double the quantity of a beam of X-ray, which one of the following approaches is NOT correct?

Inverse Square Law is useful in radiography because it indicates how the radiation intensity is affected by ___.

According to the inverse square law, if the radiology technician stands twice as far away from the x-ray tube, she will ___ her dose of scatter radiation by____.

Which technique will give the highest patient dose under the same 90 kVp?

A radiographic exposure of the chest was taken at 72 inches using 20 mAs and had an exposure of 100 mR. What would the exposure roughly be at 80 inches under the same exposure parameters?

If one lead apron attenuates 95% of an x-ray beam, two aprons will transmit approximately ____.

A grid improves the quality of a diagnostic x-ray primarily by attenuating ___.

The quality of a diagnostic x-ray beam is determined by measuring the _____.

For 100 KeV X-ray beam, linear attenuation coefficients of aluminum and lead are 0.459and 62.244/cm. What is the thickness of lead in mm equivalent to 15 mm of aluminumin ?

According to the inverse square law, if the radiology technician stands twice as far away from the x-ray tube, she will _ her dose of scatter radiation by__.