Question 1

The computed radiography image has _____.

Accepted Answer

A)   narrow exposure latitude
B)   wide exposure latitude
C)   improved contrast resolution
D)   both B and CE) B) and D)
F) All of the above D

Question 2

Switching from screen-film imaging to computed radiography can _____ patient dose.

Accepted Answer

A)   increase
B)   reduce
C)   not effect
D)   removeE) A) and D)
F) B) and C)

Question 3

When switching from screen-film imaging to computed radiography,which step is eliminated?

Accepted Answer

A)   creating the latent image
B)   reloading the cassette
C)   selecting an exposure technique
D)   processing the latent imageE) B) and C)
F) A) and B)

Question 4

The photostimulable phosphor screen is handled in a _____.

Accepted Answer

A)   reader
B)   darkroom
C)   film processor
D)   film changerE) A) and B)
F) A) and C)

Question 5

Spatial resolution,contrast resolution,noise,and artifacts are identical in screen-film imaging and computed radiography.

Accepted Answer

A) True 
 B)False

Question 6

The laser is one of the _____ features of the computed radiography reader.

Accepted Answer

A)   computer
B)   chemical
C)   mechanical
D)   opticalE) A) and B)
F) None of the above

Question 7

With computed radiography the contrast is _____.

Accepted Answer

A)   controlled by kVp
B)   controlled by mAs
C)   constant regardless of radiation exposure
D)   impossible to changeE) C) and D)
F) B) and C) C

Question 8

The 400 speed film-screen systems are still faster than computed radiography image receptors.

Accepted Answer

A) True 
 B)False

Question 9

The computed radiography cassette is called a(n) _____ plate.

Accepted Answer

A)   optical
B)   imaging
C)   laser
D)   thermoluminescentE) A) and D)
F) B) and C)

Question 10

Computed radiography screens respond to radiation with _____.

Accepted Answer

A)   fluorescence
B)   electron emission
C)   photostimulable luminescence
D)   biological phosphorescenceE) A) and D)
F) B) and C)

Question 11

The digital imaging plate can sit for some time after the erase cycle.

Accepted Answer

A) True 
 B)False

Question 12

Computed radiography imaging produces _____ gray levels.

Accepted Answer

A)   30
B)   100
C)   10,000
D)   1,000,000E) A) and D)
F) A) and C)

Question 13

The computed radiography reader is made up of _____,_____,and _____ modules.
I. mechanical
II. chemical
III. optical
IV. computer

Accepted Answer

A)   I, II, III
B)   II, III, IV
C)   I, III, IV
D)   I, II, IVE) All of the above
F) B) and C)

Question 14

The output signal from the photostimulable phosphor plate is converted from analog to digital by the _____.

Accepted Answer

A)   optical system
B)   computer controls
C)   photodetector
D)   drive mechanismE) B) and C)
F) C) and D)

Question 15

The laser beam must be less than 100 nm in diameter in order to maintain _____.

Accepted Answer

A)   consistent beam shape
B)   smooth image edges
C)   high spatial resolution
D)   high speedE) A) and C)
F) All of the above C

Question 16

Following the laser stimulation of the photostimulable phosphor,the excited electrons are _____.

Accepted Answer

A)   completely stabilized
B)   mostly stabilized
C)   still excited
D)   completely removedE) B) and C)
F) C) and D)

Question 17

Europium is the _____ of the photostimulable phosphor.

Accepted Answer

A)   image buffer
B)   scintillator
C)   phosphor
D)   activatorE) A) and B)
F) None of the above

Question 18

A photostimulable phosphor in a metastable state will emit light _____.
I. immediately
II. when stimulated by light
III. over time

Accepted Answer

A)   I
B)   II
C)   II & III
D)   I, II & IIIE) B) and C)
F) B) and D)

Question 19

Computed radiography and screen-film imaging both have a(n) _____.

Accepted Answer

A)   image receptor response function
B)   characteristic curve
C)   digital image
D)   latent imageE) B) and C)
F) B) and D)

Question 20

The principal source of noise in computed radiography is _____.

Accepted Answer

A)   scatter radiation
B)   background radiation
C)   computer noise
D)   phosphor scatterE) All of the above
F) A) and D)

Exam 15: Computed Radiography

The computed radiography image has _____.

Correct AnswerverifiedD

Switching from screen-film imaging to computed radiography can _____ patient dose.

Correct AnswerverifiedShow Answer

When switching from screen-film imaging to computed radiography,which step is eliminated?

Correct AnswerverifiedShow Answer

The photostimulable phosphor screen is handled in a _____.

Correct AnswerverifiedShow Answer

Spatial resolution,contrast resolution,noise,and artifacts are identical in screen-film imaging and computed radiography.

Correct AnswerverifiedShow Answer

The laser is one of the _____ features of the computed radiography reader.

Correct AnswerverifiedShow Answer

With computed radiography the contrast is _____.

Correct AnswerverifiedC

The 400 speed film-screen systems are still faster than computed radiography image receptors.

Correct AnswerverifiedShow Answer

The computed radiography cassette is called a(n) _____ plate.

Correct AnswerverifiedShow Answer

Computed radiography screens respond to radiation with _____.

Correct AnswerverifiedShow Answer

The digital imaging plate can sit for some time after the erase cycle.

Correct AnswerverifiedShow Answer

Computed radiography imaging produces _____ gray levels.

Correct AnswerverifiedShow Answer

The computed radiography reader is made up of _____,_____,and _____ modules. I. mechanical II. chemical III. optical IV. computer

Correct AnswerverifiedShow Answer

The output signal from the photostimulable phosphor plate is converted from analog to digital by the _____.

Correct AnswerverifiedShow Answer

The laser beam must be less than 100 nm in diameter in order to maintain _____.

Correct AnswerverifiedC

Following the laser stimulation of the photostimulable phosphor,the excited electrons are _____.

Correct AnswerverifiedShow Answer

Europium is the _____ of the photostimulable phosphor.

Correct AnswerverifiedShow Answer

A photostimulable phosphor in a metastable state will emit light _____. I. immediately II. when stimulated by light III. over time

Correct AnswerverifiedShow Answer

Computed radiography and screen-film imaging both have a(n) _____.

Correct AnswerverifiedShow Answer

The principal source of noise in computed radiography is _____.

Correct AnswerverifiedShow Answer

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D

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C

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The computed radiography reader is made up of ___,_,and ___ modules. I. mechanical II. chemical III. optical IV. computer

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C

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