Question 1

What serves the same purpose in conventional radiography as the imaging plate used in computed radiography?

Accepted Answer

A)   Grid
B)   Cassette
C)   Film
D)   View boxE) A) and D)
F) B) and D)

Question 2

Which of the following matrix sizes would produce the best image quality?

Accepted Answer

A)   64 ´ 64
B)   256 ´ 256
C)   1024 ´ 1024
D)   2048 ´ 2048E) All of the above
F) A) and C)

Question 3

What is the device that changes into digital data the electrical signal created from the light released from the CR imaging plate?

Accepted Answer

A)   Laser
B)   Photomultiplier tube
C)   Analog-to-digital converter
D)   CRTE) B) and D)
F) A) and D)

Question 4

Which of the following systems is NOT associated with direct digital radiography (DR) ?

Accepted Answer

A)   Flat panel digital
B)   Charge-coupled device
C)   Indirect conversion detector
D)   Computed radiographyE) B) and D)
F) B) and C)

Question 5

The x-ray beam exiting the patient has the capability of producing over _____ shades of gray.

Accepted Answer

A)   32
B)   256
C)   512
D)   1000E) All of the above
F) A) and D) D

Question 6

As compared to CR, a disadvantage of direct digital radiography is:

Accepted Answer

A)   increased image processing time.
B)   lower dynamic range.
C)   incompatibility with existing equipment.
D)   increased spatial resolution.E) A) and D)
F) B) and D)

Question 7

_____ convert(s)  conventional radiographs to digital images.

Accepted Answer

A)   Charge-coupled devices
B)   A film digitizer
C)   Computed radiography
D)   Digital fluoroscopyE) None of the above
F) A) and D)

Question 8

The resolution capability of the computed radiography image is approximately _____ lp/mm.

Accepted Answer

A)   2.5-5
B)   6-10
C)   12.5
D)   15E) B) and C)
F) All of the above

Question 9

How many lines would an ideal video monitor for digital radiography have?

Accepted Answer

A)   525
B)   1024
C)   1050
D)   2000E) A) and D)
F) A) and C) D

Question 10

What is the graphical display of the pixel values during digital radiography known as?

Accepted Answer

A)   Matrix
B)   Histogram
C)   Pixel
D)   VoxelE) B) and D)
F) A) and D)

Question 11

The basic unit of information in a computer is a(n) :

Accepted Answer

A)   bit.
B)   byte.
C)   word.
D)   algorithm.E) None of the above
F) A) and B)

Question 12

Which imaging method(s)  require(s)  the shortest time from exposure to image viewing?

Accepted Answer

A)   Film-screen
B)   CR
C)   DR
D)   a and bE) None of the above
F) C) and D)

Question 13

Which one of the following digital systems would have the best image quality?

Accepted Answer

A)   8 bit
B)   12 bit
C)   16 bit
D)   32 bitE) None of the above
F) All of the above

Question 14

_____ is the postprocessing technique that improves the visibility of small and high-contrast structures.

Accepted Answer

A)   Contrast enhancement
B)   Edge enhancement
C)   Subtraction
D)   SmoothingE) None of the above
F) A) and C)

Question 15

The pixel bit depth determines the amount of shades of gray the system is capable of displaying on the digital image.

Accepted Answer

A) True 
 B)False

Question 16

Increasing the number of pixels in the image matrix will increase:

Accepted Answer

A)   dynamic range.
B)   shades of gray.
C)   image brightness.
D)   spatial resolution.E) None of the above
F) B) and C)

Question 17

What is the name of an image constructed from numerical information?

Accepted Answer

A)   Analog image
B)   Matrix image
C)   Digital image
D)   Subtraction imageE) A) and C)
F) A) and D)

Question 18

Which imaging method(s)  is/are difficult to use for mobile radiography?

Accepted Answer

A)   Film-screen
B)   CR
C)   DR
D)   b and cE) B) and C)
F) None of the above

Question 19

Which of the following digital imaging systems uses a photostimulable phosphor?

Accepted Answer

A)   Digital fluoroscopy
B)   Computed radiography
C)   Direct conversion DR
D)   Charge-coupled deviceE) A) and D)
F) All of the above

Question 20

With digital imaging, using twice the needed mAs will result in an image with _____ density/brightness and _____ patient exposure.

Accepted Answer

A)   appropriate, excessive
B)   excessive, excessive
C)   excessive, appropriate
D)   appropriate, appropriateE) C) and D)
F) B) and D) A

Exam 12: Digital Imaging

What serves the same purpose in conventional radiography as the imaging plate used in computed radiography?

Correct AnswerverifiedShow Answer

Which of the following matrix sizes would produce the best image quality?

Correct AnswerverifiedShow Answer

What is the device that changes into digital data the electrical signal created from the light released from the CR imaging plate?

Correct AnswerverifiedShow Answer

Which of the following systems is NOT associated with direct digital radiography (DR) ?

Correct AnswerverifiedShow Answer

The x-ray beam exiting the patient has the capability of producing over _____ shades of gray.

Correct AnswerverifiedD

As compared to CR, a disadvantage of direct digital radiography is:

Correct AnswerverifiedShow Answer

_____ convert(s) conventional radiographs to digital images.

Correct AnswerverifiedShow Answer

The resolution capability of the computed radiography image is approximately _____ lp/mm.

Correct AnswerverifiedShow Answer

How many lines would an ideal video monitor for digital radiography have?

Correct AnswerverifiedD

What is the graphical display of the pixel values during digital radiography known as?

Correct AnswerverifiedShow Answer

The basic unit of information in a computer is a(n) :

Correct AnswerverifiedShow Answer

Which imaging method(s) require(s) the shortest time from exposure to image viewing?

Correct AnswerverifiedShow Answer

Which one of the following digital systems would have the best image quality?

Correct AnswerverifiedShow Answer

_____ is the postprocessing technique that improves the visibility of small and high-contrast structures.

Correct AnswerverifiedShow Answer

The pixel bit depth determines the amount of shades of gray the system is capable of displaying on the digital image.

Correct AnswerverifiedShow Answer

Increasing the number of pixels in the image matrix will increase:

Correct AnswerverifiedShow Answer

What is the name of an image constructed from numerical information?

Correct AnswerverifiedShow Answer

Which imaging method(s) is/are difficult to use for mobile radiography?

Correct AnswerverifiedShow Answer

Which of the following digital imaging systems uses a photostimulable phosphor?

Correct AnswerverifiedShow Answer

With digital imaging, using twice the needed mAs will result in an image with _____ density/brightness and _____ patient exposure.

Correct AnswerverifiedA

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With digital imaging, using twice the needed mAs will result in an image with _ density/brightness and _ patient exposure.

Correct Answer
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