Radiographic Exposure Chapter Exam Questions

Course Introduction

Radiographic Exposure is a course designed to introduce students to the fundamental principles and techniques involved in producing high-quality diagnostic images using radiographic equipment. The course covers essential topics such as the properties of x-rays, factors affecting image quality, image receptor systems, and the relationships among exposure time, mA, kVp, and distance. Students will learn about the importance of radiation protection, exposure calculations, and the effects of exposure variables on image density, contrast, detail, and distortion. Through a combination of theoretical instruction and hands-on practice, students gain the skills necessary to optimize radiographic images while minimizing patient dose and maintaining diagnostic integrity.

Recommended Textbook

Radiographic Imaging and Exposure 5th Edition by Terri L. Fauber

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Chapter 1: Radiation and Its Discovery

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Sample Questions

Q1) X-rays used in radiography have wavelengths that are measured in:

A) angstroms.

B) millimeters.

C) centimeters.

D) hertz.

Answer: A

Q2) The speed of light is:

A) 3 × 108 meters per second

B) 3 × 108 miles per second

C) 186,000 miles per second

D) A and B

E) A and C

Answer: E

Q3) When first developed,the branch of medicine using x-rays was called:

A) radiology.

B) radiography.

C) roentgenology.

D) imaging sciences.

Answer: C

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Page 3

Chapter 2: The X-Ray Beam

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Sample Questions

Q1) Setting identical exposure factors,which type of x-ray unit will produce the greatest heat?

A) Single phase

B) Double phase

C) Three phase

D) High frequency

Answer: D

Q2) The part of the x-ray tube that is connected to the target and causes it to turn is the: A) filament.

B) rotor.

C) stator.

D) base.

Answer: B

Q3) The amount of heat produced from any given exposure is called a: A) heat unit.

B) three-phase generator.

C) focal track.

D) Hounsfield unit.

Answer: A

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Page 4

Chapter 3: Image Formation and Radiographic Quality

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Sample Questions

Q1) Difference in the brightness levels or densities is:

A) density.

B) image contrast.

C) brightness.

D) spatial resolution.

Answer: B

Q2) Size distortion is affected by: 1)SID.

2)OID.

3)tube angulation.

A) 1 and 2 only

B) 1 and 3 only

C) 2 and 3 only

D) 1, 2, and 3

Answer: A

Q3) Approximately 20% of the primary x-ray beam actually reaches the image receptor.

A)True

B)False

Answer: False

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Page 5

Chapter 4: Digital Imaging

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Sample Questions

Q1) The monitor matrix size should be _________________ the image matrix size.

A) smaller than

B) at least as large as C) five times larger than

D) ten times larger than

Q2) The _________ provides a method of altering the image to change the display of the digital image.

A) histogram

B) lookup table

C) exposure indicator

D) matrix

Q3) The DR system does not require a separate reader unit.

A)True

B)False

Q4) Decreasing the window level will result in an image with:

A) lower contrast.

B) higher contrast.

C) decreased brightness.

D) increased brightness.

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Chapter 5: Film-Screen Imaging

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Sample Questions

Q1) The radiation- and light-sensitive material used in the emulsion of radiographic film is called?

A) Rare earth phosphors

B) Calcium tungstate

C) Sensitivity specks

D) Silver halide crystals

Q2) What is achieved when the color of light emitted by an intensifying screen matches the color of light a film responds to?

A) Chromatic spectrometry

B) Orthochromatic sensitivity

C) Panchromatic matching

D) Spectral matching

Q3) What is the effect of the presence of a dye in the phosphor layer of the intensifying screen?

A) Decreased speed, increased recorded detail, and increased patient dose

B) Decreased speed, increased recorded detail, and decreased patient dose

C) Increased speed, decreased recorded detail, and increased patient dose

D) Increased speed, decreased recorded detail, and decreased patient dose

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Chapter 6: Exposure Technique Factors

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Sample Questions

Q1) If a person stands 12 feet from the source of exposure,receives an exposure of 60 mR,and then moves to 3 feet from the source of exposure,what would be the new exposure according to the inverse square law?

A) 15 mR

B) 45 mR

C) 240 mR

D) 960 mR

Q2) Which of the following is not affected by a change in SID?

A) Recorded detail

B) Image contrast

C) Amount of radiation reaching the IR

D) Magnification

Q3) The SOD can be determined by:

A) adding SID and OID.

B) adding the MF to the OID.

C) subtracting the OID from SID.

D) subtracting the SID from the MF.

Q4) Any increase in magnification results in a decrease in recorded detail.

A)True

B)False

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Chapter 7: Scatter Control

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Sample Questions

Q1) In general,when should a grid be used?

A) When part thickness exceeds 4 cm

B) When kV exceeds 40 kVp

C) When kV exceeds 1.02 MeV

D) When part thickness exceeds 10 cm

Q2) Which beam restriction device can be cut to the size needed?

A) A collimator

B) An aperture diaphragm

C) A cylinder

D) A cone

Q3) The unrestricted primary beam produces a(n)_________ area of exposure.

A) round

B) oval

C) square

D) rectangular

Q4) Grid ratios range from:

A) 2:1 to 6:1.

B) 4:1 to 16:1.

C) 10:1 to 24:1.

D) 20:1 to 32:1.

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Chapter 8: Exposure Technique Selection

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Sample Questions

Q1) A patient measuring 26 cm requires 20 mAs at 75 kVp based on a fixed kVp-variable mAs technique chart.What technique should be used for the next patient,who measures 34 cm?

A) 40 mAs at 75 kVp

B) 80 mAs at 75 kVp

C) 20 mAs at 91 kVp

D) 40 mAs at 91 kVp

Q2) If the backup time/mAs is automatically set by the x-ray unit,the exposure should end when a maximum of _________ has been reached.

A) 600 s

B) 600 kVp

C) 600 mA

D) 600 mAs

Q3) When using a fixed kVp-variable mAs technique chart,if part thickness increases by 5 cm,what needs to happen to the mAs?

A) It should be halved.

B) It should be doubled.

C) It should be quartered.

D) It should be tripled.

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Page 10

Chapter 9: Image Evaluation

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Sample Questions

Q1) When using a digital imaging system,changing from 8 × 10 collimation to 14 × 17 collimation would result in _____________ brightness and ____________ contrast.

A) no change in; no change in B) decreased; increased C) no change in; decreased D) decreased; decreased

Q2) Using an Agfa digital imaging system,if an image's exposure indicator is 2.3 lgM while the optimal range begins at 2.6 lgM,this means that the IR was ______________ and the exposure to the IR needs to be ___________________ .

A) underexposed; increased by 30%

B) underexposed; increased by a factor of two

C) overexposed; decreased by 30%

D) overexposed; decreased by a factor of two

Q3) An area of decreased brightness visualized on a computer monitor has ________density on a film image.

A) increased

B) decreased C) no

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Chapter 10: Dynamic Imaging: Fluoroscopy

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Sample Questions

Q1) The TFTs control the current to each pixel and switch it on or off by causing the liquid crystals to twist or untwist in which type of monitor?

A) CRT monitor

B) LCD monitor

C) Plasma monitor

D) Smartphone monitor

Q2) This part of the image intensifier absorbs light and converts light to electrons.

A) Input phosphor

B) Output phosphor

C) Photocathode

D) Electrostatic focusing lenses

Q3) Each capacitor in a CCD represents a(n):

A) line.

B) image.

C) pixel.

D) electric charge.

Q4) When a CCD is exposed to light,it generates and briefly stores light energy.

A)True

B)False

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