Course Introduction
Radiation Physics Exam Practice
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Radiation Physics explores the fundamental principles and applications of ionizing and non-ionizing radiation. This course covers the nature and properties of electromagnetic and particulate radiation, interaction mechanisms with matter, radioactivity, radioactive decay, and the detection and measurement of radiation. Students examine sources and types of radiation, radiation units and dosimetry, as well as biological effects and safety considerations. Emphasis is placed on the practical aspects of radiation physics in medical, industrial, and research settings, preparing students for advanced studies or careers involving the use of radiation.
Recommended Textbook
Essentials of Radiographic Physics and Imaging 2nd Edition by James Johnston
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16 Chapters
1530 Verified Questions
1530 Flashcards
Source URL: https://quizplus.com/study-set/1322
Page 2
Chapter 1: Introduction to the Imaging Sciences
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76 Verified Questions
76 Flashcards
Source URL: https://quizplus.com/quiz/26349
Sample Questions
Q1) The purpose of the mirror inside the collimator is to
A)restrict the x-ray beam
B)allow the patient to see himself or herself
C)focus the x-ray beam
D)reflect the light source
Answer: D
Q2) How much force is needed to move a 20-kg box whose acceleration is 5 m/s²?
A)100 N.
B)100 W.
C)100 m/s².
D)100 m/s.
Answer: A
Q3) The ____________ is the SI unit equivalent to the Curie.
A)roentgen
B)Becquerel
C)sievert
D)gray
Answer: B
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3
Chapter 2: Structure of the Atom
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63 Verified Questions
63 Flashcards
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Sample Questions
Q1) The word atom is derived from the Greek word atomos,meaning
A)nuclear
B)small
C)indivisible
D)invisible
Answer: C
Q2) Each electron shell has a specific limit to the amounts of electrons it can hold.
A)True
B)False
Answer: True
Q3) The fundamental component of the atom that has the smallest mass is the A)electron
B)neutron
C)proton
D)none of the above
Answer: A
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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) When compared with a beta particle,the alpha particle is
A)much smaller
B)much larger
C)more penetrating
D)none of the above
Answer: B
Q2) The electromagnetic radiation used in tanning beds is
A)visible light
B)infrared light
C)microwaves
D)ultraviolet light
Answer: D
Q3) An object we see as white is _______________ all of the wavelengths of visible light.
A)absorbing
B)diffusing
C)reflecting
D)changing
Answer: C
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Page 5
Chapter 4: The X-Ray Circuit
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152 Verified Questions
152 Flashcards
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Sample Questions
Q1) Which of the following devices can increase or decrease voltage by a set amount?
A)Battery.
B)Capacitor.
C)Transformer.
D)A and C.
Q2) Single-phase full-wave rectified current has
A)10% ripple
B)25% ripple
C)50% ripple
D)100% ripple
Q3) The least amount of ripple is the result of
A)half-wave rectification
B)full-wave rectification
C)three-phase power
D)high-frequency generators
Q4) A step-up 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) Prepping the rotor but not making an exposure on a regular basis is related to tube damage or failure.
A)True
B)False
Q2) Electrons from the cathode that do not produce x-rays will
A)be absorbed in the envelope
B)return to the cathode filament
C)be absorbed in the air in the tube
D)continue as current flow through the circuit
Q3) How many heat units are produced with an exposure using a single phase x-ray unit,75 kVp,and 50 mAs?
A)3,750 HU.
B)5,063 HU.
C)5,288 HU.
D)5,438 HU.
Q4) To get the rotor to move,each pair of stators are energized sequentially.
A)True
B)False
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Chapter 6: X-Ray Production
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72 Verified Questions
72 Flashcards
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Sample Questions
Q1) As the distance increases,the beam quantity reaching a specific area
A)increases
B)decreases
C)stays the same
D)doubles
Q2) Changes along the x-axis of the x-ray emission spectrum reflect changes in the _________________ of the x-ray beam,whereas changes along the y-axis reflect changes in the ___________________ of the beam.
A)quality;quantity
B)quantity;quality
C)quantity;quantity
D)quality;quality
Q3) Increasing the kVp results in
A)an increase along the y-axis
B)a shift to the right along the x-axis
C)a shift to the left along the x-axis
D)A and B
E)C and C
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8
Chapter 7: X-Ray Interactions With Matter
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66 Verified Questions
66 Flashcards
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Sample Questions
Q1) Compton scattering typically occurs with x-ray photons in the energy range of
A)5-10 keV
B)20-40 keV
C)60-90 keV
D)100-135 keV
Q2) Dense material,like bone,is considered:
A)radiopaque
B)easy to penetrate
C)radiolucent
D)less likely to absorb radiation
Q3) For photoelectric interactions to occur,the energy of the incident photon
A)may be greater than the binding energy of an inner-shell electron
B)may be the same as the binding energy of an inner-shell electron
C)may be less than the binding energy of an inner-shell electron
D)A and B
E)B and C
Q4) The probability of Compton scattering depends on the atomic number of the atom.
A)True
B)False
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Chapter 8: Image Production
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66 Verified Questions
66 Flashcards
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Sample Questions
Q1) Decreased attenuation results in
A)more x-ray photons reaching the image receptor
B)fewer x-ray photons reaching the image receptor
C)no change in the number of photons reaching the image receptor
D)none of the above
Q2) Photoelectric interactions occur only at the lower end of the diagnostic range of photon energies.
A)True
B)False
Q3) All of the radiation that reaches the image receptor is used to create the radiographic image.
A)True
B)False
Q4) The radiographer has no control over the radiographic visibility of anatomic structures because the tissue does not change.
A)True
B)False
Q5) During conventional fluoroscopy,the x-ray beam stays on for an extended time. A)True
B)False
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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) The device constructed of uniform absorbers of increasing thicknesses is a
A)sensitometer
B)densitometer
C)penetrometer
D)aluminometer
Q2) A radiograph with low radiographic contrast
A)has very few densities
B)has very similar densities
C)has short-scale contrast
D)none of the above
Q3) When the image is distorted,spatial resolution or recorded detail is also reduced.
A)True
B)False
Q4) Quantum noise is a result of
A)too few x-ray photons reaching the image receptor
B)too many x-ray photons reaching the image receptor
C)x-rays with energy that is too high reaching the image receptor
D)A and C
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11
Chapter 10: Radiographic Exposure Technique
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135 Verified Questions
135 Flashcards
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Sample Questions
Q1) Doubling the mAs produces appropriate exposure to the IR when the SID is changed from 40 inches to
A)36 inches SID
B)48 inches SID
C)56 inches SID
D)60 inches SID
Q2) What type of relationship does distance have with x-ray beam intensity?
A)Direct proportional.
B)Direct but not proportional.
C)Inverse proportional.
D)Inverse but not proportional.
Q3) To visualize soft tissue structures with digital imaging,the standard exposure factors should be
A)increased
B)decreased
C)left the same
D)doubled
Q4) Tube angulation may result in elongation and reduced exposure to the IR.
A)True
B)False
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Chapter 11: Scatter Control
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80 Verified Questions
80 Flashcards
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Sample Questions
Q1) The simplest type of beam-restricting device is a flat piece of lead with a hole in it called a(n)
A)aperture diaphragm
B)collimator
C)cone or cylinder
D)none of the above
Q2) To overcome the decrease in sharpness caused by the air gap technique,an increase in SID is required.
A)True
B)False
Q3) 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
Q4) The most effective and often used radiographic beam-restriction device is the A)aperture diaphragm
B)collimator
C)cone or cylinder
D)none of the above
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) Single-emulsion film must be placed in the cassette so that the emulsion side is facing away from the intensifying screen.
A)True
B)False
Q2) Primary workstation displays are used for
A)viewing the image for the first time
B)official image interpretation
C)viewing the digital image at the radiographer's console
D)All of the above
Q3) Amorphous silicon is used as the
A)photoconductor for indirect capture DR imaging
B)photodetector for indirect capture DR imaging
C)photoconductor for direct capture DR imaging
D)photodetector for direct capture DR imaging
Q4) The two methods for indirect capture in DR include
A)charge-coupled devices
B)photoconductors and TFT arrays
C)scintillator and TFT array
D)A and C
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Chapter 13: Exposure Technique Selection
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63 Verified Questions
63 Flashcards
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Sample Questions
Q1) When your patient for an AP abdomen is very heavy,using AEC results in A)underexposure to the IR
B)overexposure to the IR
C)appropriate exposure to the IR
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) The detector(s)selected for an image should be
A)the center detector because that is where the central ray is going
B)the two or three detectors that are covered by the part being imaged
C)the ones that are superimposed by the anatomic structure of interest
D)all three so that the system can work properly
Q4) Once a part has been selected using APR,the exposure factors cannot be adjusted. A)True
B)False
Page 15
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Chapter 14: Image Intensified Fluoroscopy
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95 Verified Questions
95 Flashcards
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Sample Questions
Q1) An expression of the ability of an image intensifier tube to convert x-ray energy into light energy and increase the brightness of the image in the process is the
A)brightness gain
B)flux gain
C)minification gain
D)conversion factor
Q2) Fluoroscopic imaging systems operate at: ________
A)2-5 mA
B)15-20 mA
C)200-500 mA
D)Unlimited mA
Q3) In fluoroscopy,shape distortion is caused by
A)angling the x-ray tube
B)angling the image intensifier in the fluoroscopic tower
C)inaccurate control or focusing of the electrons released at the periphery of the photocathode,and the curved shape of the photocathode
D)inaccurate control or focusing of the electrons released at the periphery of the photocathode,and the flat shape of the photocathode
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Chapter 15: Additional Equipment
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53 Verified Questions
53 Flashcards
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Sample Questions
Q1) DXA stands for
A)double x-ray absorption
B)density x-ray attenuation
C)dual energy x-ray absorptiometry
D)double density x-ray attenuation
Q2) The radiation dose to the breast ______________________ when magnification techniques are used.
A)is lower
B)is higher
C)remains the same
Q3) The radiographer should stand at least _________ away from the patient and x-ray tube when making an exposure using mobile radiographic equipment
A)2 feet
B)4 feet
C)6 feet
D)10 feet
Q4) A dedicated unit is one that is designed for specific imaging procedures
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) Which of the following is true concerning adaptive statistical iterative reconstruction (ASIR)?
A)ASIR is a reconstruction technique that starts reconstruction after a first-pass FBP reconstruction
B)ASIR techniques shorten reconstruction time while maintaining much lower image noise than if the same raw data were reconstructed with FBP alone
C)ASIR reduces quantum noise substantially with no impact on spatial or contrast resolution
D)All of the above
Q2) Noise can be reduced by using a
A)lower pitch
B)higher pitch
C)shorter rotation time
D)None of the above
Q3) The image data is the
A)linear attenuation coefficients
B)matrix of CT numbers
C)same as the raw data
D)None of the above
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Page 18