FREE RADIOLOGY AND STUDY GAMES ABOUT DIG IMG

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FREE RADIOLOGY AND STUDY GAMES ABOUT DIG IMG

QUIZ 1 SET2 EXAM QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -22 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation

Question 1: Raster pattern

Answer:

movement of the e- beam

Question 2: What is the mA range used in flouro?

Answer:

.5-5mA (avg. 1-3 mA)

Question 3: Modulation

Answer:

the size of the video signal is proportional to the light incident on the TV camera tube

Question 4: What is the difference between lens coupling and fiber optics?

Answer:

fiber optics cannot accommodate aux devices, cannot take spots.

Question 5: Explain the relationship between magnification and minification gain

Answer:

increasing magnification decreases minification gain which decreases brightness gain Question 6: In the conversion factor formula conversion factor equals:

Answer:

output phosphor illumination (cd/m2) / input exposure rate ( mR/s)

Question 7: Explain the relationship between FOV and magnification

Answer:

a smaller FOV produces greater magnification

Question 8: What causes vignetting?

Answer:

unfocused remnant radiation interacts with the periphery of the input phosphor

Question 9: What is vignetting

Answer:

part of the image showing decreased brightness at the periphery

Question 10: How is television monitoring set up?

Answer:

the image intensifier is coupled directly to a television camera tube

Question 11: What is the function of television monitoring?

Answer:

to convert the light image into a video signal sent to the monitor

Question 12: In the formula for brightness gain, brightness gain equals what?

Answer:

minification gain X flux gain

Question 13: What is the purpose of the ABC?

Answer:

to maintain image brightness by adjusting exposure factors for varying part thicknesses Question 14: What exposure factor is changed and how to maintain brightness when we change to a larger input phosphor?

Answer:

mA is increased

Question 15: What is the function of the objective lens in the beam splitter?

Answer:

accepts light from the output phosphor and converts it into 2 parallel beams

Question 16: What is minification gain?

Answer:

ratio of size of the input phosphor to the output phosphor

Question 17: How does lens coupling work?

Answer:

with the use of a beam splitter light is divided between the TV camera and aux devices

Question 18: Explain the relationship between magnification and patient dose

Answer:

increased magnification always increases pt dose Question 19: Magnification mode results in:

Answer:

better spatial resolution, better contrast resolution, higher pt dose Question 20: In the minfication gain formula minification gain equals:

Answer:

square of the diameter of the input phosphor / square of the diameter of the output phosphor

Question 21: ABC

Answer:

automatic brightness control, automatic dose control or automatic brightness stabilization

Question 22: What are the most popular types of television cameras?

Answer:

vidicon and plumicon