Radiographic Imaging Principles
Pre-Test Questions
Course Introduction
Radiographic Imaging Principles explores the fundamental concepts and techniques underlying the creation of medical images through the use of x-rays. The course covers topics such as the nature of x-ray production, interaction of radiation with matter, image formation, and factors influencing image quality including contrast, density, detail, and distortion. Students will examine the properties of imaging systems, quality assurance, and radiation safety, gaining an understanding of equipment operation and the physical principles essential for optimizing image acquisition while minimizing patient exposure. This foundational knowledge prepares students for practical applications in clinical radiography and further study in advanced imaging modalities.
Recommended Textbook
Essentials of Radiographic Physics and Imaging 2nd Edition by James Johnston
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16 Chapters
1530 Verified Questions
1530 Flashcards
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Chapter 1: Introduction to the Imaging Sciences
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76 Verified Questions
76 Flashcards
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Sample Questions
Q1) Mass does not change with gravitational force.
A)True
B)False
Answer: True
Q2) Acute radiodermatitis was
A)the radiation burn resulting from excessive exposure to x-rays
B)common among early patients and operators of x-ray equipment
C)a delayed reaction to excessive x-ray exposure
D)all of the above
Answer: D
Q3) If 240 J of work is done in 1 minute,how much power is consumed?
A)4 J.
B)4 W.
C)4 kg-m/s.
D)4 m/s.
Answer: B
Q4) When 3 kilograms of frozen water is melted,it produces 3 kilograms of water.
A)True
B)False
Answer: True
Page 3
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Chapter 2: Structure of the Atom
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Sample Questions
Q1) The atoms of the elements at the top of the periodic table of elements are the most complex.
A)True
B)False
Answer: False
Q2) The most commonly known modern atomic theory was developed by
A)Bohr
B)Rutherford
C)Dalton
D)Thomson
Answer: A
Q3) If an atom has more protons than electrons it will
A)have a negative charge
B)have a positive charge
C)be electrically neutral
D)have neither a positive nor negative charge
Answer: B
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Page 4
Chapter 3: Electromagnetic and Particulate Radiation
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58 Verified Questions
58 Flashcards
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Sample Questions
Q1) The formula E = hf demonstrates that
A)as frequency increases,energy decreases
B)as frequency increases,energy increases
C)as energy increases,heat decreases
D)as energy increases,heat increases
Answer: B
Q2) All of the electromagnetic radiations are capable of ionizing matter.
A)True
B)False
Answer: False
Q3) Frequency is typically measured in A)hertz
B)feet
C)centimeters
D)meters
Answer: B
Q4) All electromagnetic radiation travels at the same speed.
A)True
B)False
Answer: True
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Chapter 4: The X-Ray Circuit
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152 Verified Questions
152 Flashcards
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Sample Questions
Q1) The rheostat is found on the
A)primary circuit
B)secondary circuit
C)filament circuit
D)none of the above
Q2) One Coulomb is equal to the electrical charge of 6.25 × 10¹
A)electrons
B)protons
C)neutrons
D)nuclei
Q3) The study of stationary electric charges is
A)electromagnetism
B)electrodynamics
C)electronics
D)electrostatics
Q4) A step-down transformer results in
A)decreased current
B)decreased voltage
C)decreased resistance
D)A and B
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Chapter 5: The X-Ray Tube
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110 Verified Questions
110 Flashcards
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Sample Questions
Q1) The focusing cup is part of the
A)filament circuit
B)primary circuit
C)secondary circuit
D)none of the above
Q2) Prior to the introduction of protective circuits,______________ were used to determine if a particular combination of exposure factors was safe or unsafe for a given x-ray tube.
A)tube cooling charts
B)tube rating charts
C)technique charts
D)QC charts
Q3) The induction motor turns the rotor of a specialty x-ray tube ___________ revolutions per minute.
A)1400
B)3400
C)6000
D)10,000
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7
Chapter 6: X-Ray Production
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72 Flashcards
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Sample Questions
Q1) The x-axis for all emission spectra represents the A)energy level of the photons
B)number of photons
C)HVL of the photons
D)amount of transmitted radiation
Q2) Changing from a high-frequency generator to a single-phase generator results in the x-ray emission spectrum
A)changing along the x-axis
B)changing along the y-axis
C)both of the above
D)neither of the above
Q3) A discrete emission spectrum is a graphic representation of
A)characteristic radiation
B)bremsstrahlung radiation
C)remnant radiation
D)A and B
E)B and C
Q4) The discrete emission spectrum is limited to a few specific values.
A)True
B)False
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Chapter 7: X-Ray Interactions With Matter
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Sample Questions
Q1) The x-ray photon produced during classical scattering
A)is lower energy than the incident photon
B)is higher energy than the incident photon
C)travels in a different direction than the incoming photon
D)travels in the same direction than the incoming photon
Q2) Irradiation of water can create harmful free radicals that then indirectly damage molecules and cells.
A)True
B)False
Q3) The Compton electron
A)typically exits the patient as part of the remnant radiation
B)does not have enough energy to produce further interactions
C)has enough energy to produce further interactions
D)A and B
Q4) After ejection from the atom's nucleus,when the positron interacts with an electron
A)an annihilation event occurs
B)the electron and positron are both destroyed
C)two x-ray photons are produced
D)all of the above
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Chapter 8: Image Production
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66 Flashcards
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Sample Questions
Q1) In the image intensifier,the photocathode
A)converts remnant radiation to light
B)focuses the electrons
C)converts light to electrons
D)absorbs the energized electrons and produces a brighter image
Q2) Less than _________ of the primary beam entering the part reaches the image receptor.
A)1%
B)5%
C)18%
D)99%
Q3) The various shades of gray or brightness created on the radiographic image
A)are present because of differential absorption
B)makes the anatomic structures visible
C)represent the radiation that was absorbed or transmitted
D)all of the above
Q4) The radiographer has no control over the radiographic visibility of anatomic structures because the tissue does not change.
A)True
B)False
Page 10
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Chapter 9: Image Quality and Characteristics
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129 Verified Questions
129 Flashcards
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Sample Questions
Q1) A radiograph that is too light has ________________ to visualize the anatomic structures.
A)excessive brightness
B)excessive density
C)insufficient density
D)A and B
E)A and C
Q2) To measure resolution,a ______________ is necessary.
A)sensitometer
B)densitometer
C)resolution test pattern
D)resolution camera
Q3) The degree of difference between adjacent densities or brightness levels is called A)density
B)detail
C)contrast
D)magnification
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11
Chapter 10: Radiographic Exposure Technique
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135 Flashcards
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Sample Questions
Q1) For most pediatric examinations,it is recommended that the kVp
A)be reduced by 15%
B)be increased by 15%
C)be reduced by 50%
D)be increased by 50%
Q2) If the intensity of radiation at 36 inches SID is 600 mR,what is the intensity if the distance is increased to 60 inches SID?
A)216 mR.
B)359.9 mR.
C)1000 mR.
D)1666.7 mR.
Q3) Reducing the amount of scatter radiation reaching the IR results in
A)lower radiographic contrast
B)higher radiographic contrast
C)improved recorded detail
D)reduced recorded detail
Q4) More scatter radiation exits the patient when using higher kilovoltage.
A)True
B)False
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Chapter 11: Scatter Control
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80 Flashcards
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Sample Questions
Q1) An IR that has a grid permanently attached to its front surface is a
A)wafer grid
B)bucky
C)grid cap
D)grid cassette
Q2) A short-dimension grid
A)is typically used for most examinations
B)has lead strips running perpendicular to the long axis of the grid
C)has lead strips running parallel to the long axis of the grid
D)A and B
Q3) To compensate for the reduction of radiation reaching the IR when a grid is used,___________ is typically increased.
A)SID
B)kVp
C)mAs
D)OID
Q4) It is safe to assume that the x-ray beam field size and the light field size are exactly the same.
A)True
B)False
Page 13
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Chapter 12: Image Receptors
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176 Verified Questions
176 Flashcards
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Sample Questions
Q1) Magnetic tape storage media is one of the newest storage technologies.
A)True
B)False
Q2) The relative speed of a standard or fast screen-film system is approximately.
A)50
B)100
C)400
D)800
Q3) The manifest image
A)is the image after exposure to exit radiation and before chemical processing
B)is the image after chemical processing
C)is the radiographic image
D)B and C
Q4) The values of interest (VOI)
A)is the graphic representation of a data set
B)determine what section of the histogram data set should be included in the displayed image
C)determine what section of the histogram data set should be included in the latent image
D)is the useful area of the digital image receptor
Page 14
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Chapter 13: Exposure Technique Selection
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Sample Questions
Q1) The amount of electric charge produced in an AEC detector depends on the amount of radiation absorbed by the detector.
A)True B)False
Q2) With digital imaging using AEC,if an AP thoracic spine is imaged using 110 kVp instead of 80 kVp,the brightness in the area of interest is __________________ and the patient exposure is ________________________.(Assume all other factors are appropriate. )
A)darker;higher
B)unchanged;higher
C)lighter;lower
D)unchanged;lower
Q3) Ionization chamber AEC detectors are entrance-type devices because the x-rays must
A)enter the detector after passing through the IR
B)enter the detector before entering the patient
C)enter the detector before getting to the IR
Q4) Once a part has been selected using APR,the exposure factors cannot be adjusted. A)True B)False
15
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Chapter 14: Image Intensified Fluoroscopy
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Sample Questions
Q1) The function of the fluoroscopic unit that maintains the overall appearance of the fluoroscopic image (contrast and density)by automatically adjusting the kilovoltage peak (kVp),milliamperage (mA),or both is
A)DQE
B)APR
C)ABC
D)AEC
Q2) Flat-panel detectors for fluoroscopic imaging can be the A)cesium iodide amorphous silicon indirect-capture detector
B)amorphous selenium direct-capture detector
C)amorphous silicon direct-capture detector
D)A and B
E)A and C
Q3) The ________________ is (are)found along the entire length of the image intensifier.
A)input phosphor
B)output phosphor
C)photocathode
D)electrostatic focusing lenses
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Page 16
Chapter 15: Additional Equipment
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53 Flashcards
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Sample Questions
Q1) This type of dedicated unit is typically used to image the mandible and teeth
A)Chest
B)Panorex
C)Mammography
D)Bone densitometry
Q2) When a panorex examination is being performed,the x-ray tube and image receptor move
A)from side to side
B)around the patient
C)up and down
D)very little
Q3) To produce the low kVp photons needed for mammography,the tube anode target is made of
A)molybdenum
B)tungsten
C)rhodium
D)A and C
Q4) The mammography unit's x-ray tube window is made of beryllium.
A)True
B)False
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Chapter 16: Computed Tomography
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136 Verified Questions
136 Flashcards
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Sample Questions
Q1) Pediatric protocols are unnecessary because the equipment will always adjust for the smaller patient size.
A)True
B)False
Q2) Prior to spiral CT,the patient moved through the gantry one small increment or step at a time.
A)True
B)False
Q3) Also known as low contrast resolution,this quality determines the system's ability to distinguish between very similar tissues
A)Noise
B)Spatial resolution
C)Contrast resolution
D)All of the above
Q4) A pitch of 1 indicates that with each rotation of the tube
A)the table is moving farther than the slice thickness
B)the table is moving less than the slice thickness
C)the table is moving the same distance as the slice thickness
D)None of the above
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