FREE RADIOLOGY AND STUDY GAMES ABOUT IMAGING 2

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FREE RADIOLOGY AND STUDY GAMES ABOUT IMAGING 2

FINAL EXAM QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -27 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation

Question 1: Pixel Size formula

Answer:

Pixel size=Field of View/matrix Question 2: 16:1

Answer:

6 Question 3: 6:1

Answer:

3

Question 4: Modulation Transfer Function

Answer:

Mathematical function that measures the ability of a detector to transfer its spatial resolution characteristics to the image.

Question 5: Intensifier Flouro Step 5

Answer:

OUTPUT SCREEN

-coated with ZnCdS -converts photoelectrons into light -diameter of the output screen is 1/10 the diameter of the input screen

Question 6: Brightness Gain

Answer:

Minification Gain * Flux Gain

Question 7: Inverse Square Law

Answer:

I1/I2=D2^2/D1^2

Question 8: 8:1

Answer:

4

Question 9: Without a grid

Answer:

1

Question 10: Calculating Size Distortion

Answer:

SID=Magnification Factor * SOD

Question 11: Flux Gain Formula

Answer:

the number of light photons at the output screen/the number of light photons at the input screen

Question 12: Calculating Object size

Answer:

Image size=Object size*Magnification Factor

Question 13: Bit depth

Answer:

number of bits per pixel

Question 14: Grid conversion formula

Answer:

mAs1/mAs2=GCF1/GCF2

Question 15: Intensifier Flouro Step 2

Answer:

PHOTOCATHODE

-the light from the input screen strikes the photocathode -made of antimony cesium -emits photoelectrons

Question 16: Minification Gain

Answer:

(Diameter of the input screen/diameter of the output screen)^2

Question 17: Window Level

Answer:

The center of the range of numbers in a digital image BRIGHTNESS

Question 18: Exposure Maintenance Formula

Answer:

mAs1/mAs2=D1^2/D2^2 Question 19: 5:1

Answer:

2

Question 20: Intensifier Flouro Step 4

Answer:

ANODE -small ring of metal with a charge -attracts photolectrons

Question 21: SID Formula

Answer:

SID=SOD+OID

Question 22: Bit

Answer:

Discrete units used by computers for processing information Question 23: 10:1,12:1

Answer:

5

Question 24: Window Width

Answer:

The range of numbers in a digital image CONTRAST

Question 25: Intensifier Flouro Step 3

Answer:

ELECTROSTATIC LENSES

-series of electrodes -accelerate and focus photoelectrons

Question 26: Intensifier Flouro Step 1

Answer:

INPUT SCREEN

-coverts x-ray photons to light photons -coated with cesium iodide -Diameter range 13-30 cm

Question 27: Detective Quantum Efficiency

Answer:

measures the efficiency of the detector to send useful signal to the image signal/noise ratio, by percentage