Question 1

Approximately _______% of the x-ray beam incident on the patient is transmitted through the patient without interaction to become part of the image-forming beam.

Accepted Answer

A)   90-99
B)   80-89
C)   20-29
D)   1E) A) and D)
F) None of the above

Question 2

The positive beam limiting device (PBL)  assures that the x-ray beam is collimated to __________________.

Accepted Answer

A)   the exact part size
B)   1 cm inside image receptor size
C)   the image receptor size
D)   1 cm outside image receptor sizeE) B) and C)
F) A) and D)

Question 3

The x-ray interaction that contributes to the clear parts of the image is _____________.

Accepted Answer

A)   coherent scatter
B)   Compton interaction
C)   photoelectric interaction
D)   pair productionE) A) and D)
F) C) and D)

Question 4

Which kVp selection would result in the most scattered x-rays in the image-forming beam?

Accepted Answer

A)   90 kVp
B)   75 kVp
C)   60 kVp
D)   50 kVpE) B) and C)
F) A) and D)

Question 5

How can you improve image contrast with a heavy patient without increasing patient dose?

Accepted Answer

A)   Lower kVp and raise mAs.
B)   Use tight collimation.
C)   Raise kVp and lower mAs.
D)   Do both A and B.E) A) and B)
F) A) and C)

Question 6

Decreasing the kVp will increase ___________.

Accepted Answer

A)   patient dose
B)   image noise
C)   Compton scatter
D)   optical densityE) A) and D)
F) A) and C)

Question 7

The use of a compression device will increase __________.

Accepted Answer

A)   film fog
B)   patient dose
C)   contrast
D)   scatterE) A) and C)
F) A) and B) C

Question 8

A fixed aperture diaphragm should leave a _____ cm unexposed border on the film.

Accepted Answer

A)   0.1
B)   0.5
C)   1
D)   2E) None of the above
F) A) and B)

Question 9

The most commonly used beam restricting device is the ____________.

Accepted Answer

A)   extension cone
B)   variable collimator
C)   aperture diaphragm
D)   compression deviceE) C) and D)
F) B) and C)

Question 10

Photoelectric interactions increase when ___________ is decreased.

Accepted Answer

A)   mAs
B)   patient thickness
C)   filtration
D)   kVpE) None of the above
F) C) and D) D

Question 11

The x-rays that are transmitted through the patient without interaction contribute to ______________.

Accepted Answer

A)   useful information
B)   film fog
C)   image noise
D)   All of the aboveE) B) and C)
F) A) and C)

Question 12

Lowering kVp ________ patient dose and _________ image contrast.

Accepted Answer

A)   lowers, decreases
B)   increases, decreases
C)   lowers, increases
D)   increases, increasesE) C) and D)
F) B) and C)

Question 13

Beam restriction with a(n)  ____________ is only accurate at a fixed SID.

Accepted Answer

A)   aperture diaphragm
B)   cone
C)   collimator
D)   PBL deviceE) B) and C)
F) B) and D)

Question 14

Scatter radiation increases as ___________________ increases.

Accepted Answer

A)   photoelectric absorption
B)   field size
C)   filtration
D)   contrastE) A) and C)
F) A) and B)

Question 15

The three primary factors influencing the intensity of scatter in the image-forming beam are ___________________.

Accepted Answer

A)   mAs, kVp, and collimation
B)   mAs, filtration, and grids
C)   kVp, field size, and patient thickness
D)   filtration, patient thickness, and mAsE) C) and D)
F) B) and D)

Question 16

The use of __________ improves contrast and reduces patient dose.

Accepted Answer

A)   collimation
B)   high kVp
C)   low kVp
D)   less filtrationE) A) and D)
F) None of the above

Question 17

Image-forming x-rays include those which have been _________________.

Accepted Answer

A)   transmitted without interaction
B)   scattered through Compton interaction
C)   absorbed through photoelectric interaction
D)   Both A and BE) A) and D)
F) C) and D) D

Question 18

Federal regulations passed in _____ required that positive beam limiting devices be on all manufactured x-ray collimators.

Accepted Answer

A)   1954
B)   1974
C)   1994
D)   2000E) A) and B)
F) A) and C)

Question 19

Compton scatter contributes to _____________.

Accepted Answer

A)   useful information
B)   image noise
C)   image contrast
D)   All of the aboveE) B) and C)
F) A) and D)

Question 20

Contrast resolution is improved by _____________.

Accepted Answer

A)   tight collimation
B)   lowering kVp
C)   patient compression
D)   All of the aboveE) A) and C)
F) A) and D)

Exam 11: Control of Scatter Radiation

Approximately _______% of the x-ray beam incident on the patient is transmitted through the patient without interaction to become part of the image-forming beam.

Correct AnswerverifiedShow Answer

The positive beam limiting device (PBL) assures that the x-ray beam is collimated to __________________.

Correct AnswerverifiedShow Answer

The x-ray interaction that contributes to the clear parts of the image is _____________.

Correct AnswerverifiedShow Answer

Which kVp selection would result in the most scattered x-rays in the image-forming beam?

Correct AnswerverifiedShow Answer

How can you improve image contrast with a heavy patient without increasing patient dose?

Correct AnswerverifiedShow Answer

Decreasing the kVp will increase ___________.

Correct AnswerverifiedShow Answer

The use of a compression device will increase __________.

Correct AnswerverifiedC

A fixed aperture diaphragm should leave a _____ cm unexposed border on the film.

Correct AnswerverifiedShow Answer

The most commonly used beam restricting device is the ____________.

Correct AnswerverifiedShow Answer

Photoelectric interactions increase when ___________ is decreased.

Correct AnswerverifiedD

The x-rays that are transmitted through the patient without interaction contribute to ______________.

Correct AnswerverifiedShow Answer

Lowering kVp ________ patient dose and _________ image contrast.

Correct AnswerverifiedShow Answer

Beam restriction with a(n) ____________ is only accurate at a fixed SID.

Correct AnswerverifiedShow Answer

Scatter radiation increases as ___________________ increases.

Correct AnswerverifiedShow Answer

The three primary factors influencing the intensity of scatter in the image-forming beam are ___________________.

Correct AnswerverifiedShow Answer

The use of __________ improves contrast and reduces patient dose.

Correct AnswerverifiedShow Answer

Image-forming x-rays include those which have been _________________.

Correct AnswerverifiedD

Federal regulations passed in _____ required that positive beam limiting devices be on all manufactured x-ray collimators.

Correct AnswerverifiedShow Answer

Compton scatter contributes to _____________.

Correct AnswerverifiedShow Answer

Contrast resolution is improved by _____________.

Correct AnswerverifiedShow Answer

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C

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D

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Lowering kVp patient dose and _ image contrast.

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D

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