Diagnostic Imaging Physics
Practice Questions
Course Introduction
Diagnostic Imaging Physics explores the fundamental principles underlying various medical imaging modalities, including X-ray, computed tomography (CT), magnetic resonance imaging (MRI), ultrasound, and nuclear medicine. The course covers the physics of image formation, interaction of radiation with matter, image quality metrics, and safety considerations. Students will gain an understanding of instrumentation and technology used in clinical settings, as well as methods for optimizing image acquisition and minimizing patient risk. Emphasis is placed on the quantitative analysis of imaging systems and on the physical principles that guide interpretation and technological development in diagnostic radiology.
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) Newton's first law of motion states that,unless acted on by an external force,an object at rest
A)will stay at rest
B)will move very slowly
C)will accelerate very quickly
D)none of the above
Answer: A
Q2) A radiographic unit that can be taken to the patient's bedside is considered
A)mobile equipment
B)permanently installed equipment
C)bedside equipment
D)stationary equipment
Answer: A
Q3) 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
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Page 3
Chapter 2: Structure of the Atom
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63 Flashcards
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Sample Questions
Q1) Elements can only occur naturally.
A)True
B)False
Answer: False
Q2) When the bond between two atoms is due to their sharing an outer-shell electron,this is called a
A)molecular bond
B)ionic bond
C)compounding bond
D)covalent bond
Answer: D
Q3) The N shell can hold _______ electrons.
A)4
B)8
C)32
D)64
Answer: C
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Page 4
Chapter 3: Electromagnetic and Particulate Radiation
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58 Flashcards
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Sample Questions
Q1) Electromagnetic radiation is a form of energy that originates from A)electricity
B)magnetism
C)the atom
D)something moving in space
Answer: C
Q2) An ion pair is
A)an electron and proton
B)a proton and neutron
C)an atom and the electron that was removed from it
D)an atom with an extra electron and an atom that is missing an electron
Answer: C
Q3) All of the electromagnetic radiations are capable of ionizing matter.
A)True
B)False
Answer: False
Q4) Higher energy radiation acts more like waves than like particles.
A)True
B)False
Answer: False
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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) A 12-volt battery use 12 Joules of energy to move
A)1 Coulomb of charge
B)2 Coulombs of charge
C)12 Coulombs of charge
D)24 Coulombs of charge
Q2) The unit of measurement of electrical charges (SI)is
A)Watt
B)Joule
C)Newton
D)Coulomb
Q3) The secondary side of the high-voltage transformer is found on the A)primary circuit
B)secondary circuit
C)filament circuit
D)none of the above
Q4) A material that has a large number of free electrons is a
A)good insulator
B)good conductor
C)poor conductor
D)All of the above
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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 formula kVp × mA × s × c is used to calculate
A)heat units
B)cooling time
C)heating time
D)Hounsfield units
Q2) In terms of the x-ray tube,envelope is another name for the
A)anode
B)cathode
C)glass or metal enclosure
D)induction motor
Q3) When the exposure switch at the operating console is first depressed:
A)high voltage creates a large potential difference between the anode and cathode
B)the anode starts rotating
C)thermionic emission is achieved
D)B and C
E)A and C
Q4) The stator is made up of electromagnets.
A)True
B)False
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Chapter 6: X-Ray Production
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72 Flashcards
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Sample Questions
Q1) Half-value layer (HVL)is used to measure
A)beam intensity
B)beam quantity
C)beam quality
D)all of the above
Q2) The discrete emission spectrum typically displays
A)K-characteristic photon energies
B)L-characteristic photon energies
C)all of the above
D)none of the above
Q3) The purpose of beam filtration is to
A)control beam quantity
B)reduce patient dose
C)reduce the wear and tear on the tube
D)all of the above
Q4) The stronger the attraction between the filament electron and the nucleus,the less energy the brems photon has.
A)True
B)False
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Chapter 7: X-Ray Interactions With Matter
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Sample Questions
Q1) Compton scattering results in
A)a Compton electron
B)a secondary electron
C)a Compton scatter photon
D)all of the above
Q2) The end product(s)of a photoelectric interaction is (are)
A)a high-energy x-ray photon
B)a photoelectron
C)an ionized atom
D)B and C
Q3) To minimize occupational exposure,the technologist should A)never go in an x-ray room during a procedure
B)wear protective apparel (lead aprons,gloves,etc. )when in the room during imaging
C)stand close to the patient's head
D)B and C
Q4) The photoelectric interaction and Compton interaction can both result in a characteristic cascade,producing characteristic radiation.
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) Place the following digital imaging steps in the correct order,from beginning to end:
I remnant radiation reaches the digital image receptor
II the manifest image is displayed on a monitor
III the manifest image can be adjusted because it is composed of digital data
IV the latent image is processed by the computer
A)III,IV,I,II
B)I,IV,II,III
C)I,II,III,IV
D)IV,III,II,I
Q2) Which of the following is an example of an image receptor?
A)Film-screen.
B)Digital.
C)Absorption.
D)A and B.
Q3) Reduction in the energy or amount of radiation in the primary beam is attenuation.
A)True
B)False
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10
Chapter 9: Image Quality and Characteristics
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129 Verified Questions
129 Flashcards
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Sample Questions
Q1) A radiographic film's sensitivity to exposure describes its
A)exposure latitude
B)speed
C)film contrast
D)speed point
Q2) Distortion is misrepresentation of the size or shape of the anatomy being imaged.
A)True
B)False
Q3) Because it reduced recorded detail,it is always best to minimize shape distortion in radiographic imaging.
A)True
B)False
Q4) To measure resolution,a ______________ is necessary.
A)sensitometer
B)densitometer
C)resolution test pattern
D)resolution camera
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11
Chapter 10: Radiographic Exposure Technique
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Sample Questions
Q1) When the intensities of radiation exiting the patient are very different from each other,the resulting film image has
A)low contrast
B)high contrast
C)short-scale contrast
D)A and C
E)B and C
Q2) In maintaining the same mAs,there is a(n)________________ relationship between mA and exposure time.
A)direct
B)inverse
C)added
D)none of the above
Q3) The formula that can be used to calculate the object size when the image size and MF are known is
A)object size = MF/image size
B)object size = image size/MF
C)object size = image size × MF
D)none of the above
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Page 12
Chapter 11: Scatter Control
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80 Verified Questions
80 Flashcards
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Sample Questions
Q1) Linear grids are the most commonly used because
A)they are very inexpensive
B)the tube can be angled in all directions
C)the tube can be angled in the direction of the lead lines
D)all of the above
Q2) The air gap technique reduces the amount of scatter radiation reaching the IR because
A)more scatter is absorbed in the air
B)less scatter is produced in the patient
C)more scatter misses the IR
D)less scatter misses the IR
Q3) For a lateral lumbar spine,placing a lead shield on the table behind the area of exposure
A)reduces the scatter exiting the patient
B)reduces the scatter reaching the IR
C)increases the scatter reaching the IR
D)A and B
Q4) The grid used for the air gap technique should be high frequency. A)True
B)False
Page 13
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Chapter 12: Image Receptors
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176 Flashcards
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Sample Questions
Q1) After the PSP is exposed to x-rays,all of the energy is released as light,the same as intensifying screens.
A)True
B)False
Q2) Orthochromatic film is sensitive to
A)blue light
B)green light
C)red light
D)any light
Q3) The ideal expression of digital detector image resolution is the A)Nyquist frequency
B)modulation transfer function (MTF)
C)limiting spatial resolution (LSR)
D)detective quantum efficiency (DQE)
Q4) Magnetic tape storage media is one of the newest storage technologies.
A)True
B)False
Q5) It is appropriate to use a higher kVp with digital examinations.
A)True
B)False
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Chapter 13: Exposure Technique Selection
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Sample Questions
Q1) Phototimer AEC devices convert the radiation to light energy.
A)True
B)False
Q2) The amount of electric charge produced in an AEC detector depends on the amount of radiation absorbed by the detector.
A)True
B)False
Q3) With film-screen imaging using AEC,if an AP thoracic spine is imaged using 110 kVp instead of 80 kVp,the density in the area of interest will be __________________ and the image contrast will be ________________________.(Assume all other factors are appropriate. )
A)light;lower
B)dark;higher
C)the same;lower
D)the same;higher
Q4) Today's AEC system is most likely use a(n)
A)ionization chamber
B)Geiger counter
C)phototimer
D)none of the above
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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) The conventional method for viewing the fluoroscopic image is by
A)using a handheld device
B)looking directly at the output phosphor
C)using a television monitor
D)using a mirror-optics system
Q2) If a 30/23/15 cm image intensifier is operated in the 23-cm mode,the fluoroscopic image will be magnified by a factor of
A)1.3
B)1.5
C)1.7
D)2
Q3) This recording system uses 70-mm or 105-mm film
A)Cassette spot filming
B)Film cameras for spot filming
C)Videotape
D)None of the above
Q4) ABC is very similar to AEC in that it controls the length of the exposure to maintain consistent image brightness.
A)True
B)False
Page 16
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Chapter 15: Additional Equipment
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53 Flashcards
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Sample Questions
Q1) Unless otherwise required,during C-arm fluoroscopic procedures the x-ray tube should be located.
A)beneath the patient
B)to the side of the patient
C)above the patient
Q2) The horizontal level that extends through the body that includes the pivot point is the
A)tomographic amplitude
B)exposure amplitude
C)fulcrum
D)focal plane
Q3) The radiation dose to the breast ______________________ when magnification techniques are used.
A)is lower
B)is higher
C)remains the same
Q4) A dedicated chest room allows the radiographer to stay in the room while the images are being processed.
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) Using a large matrix and thin slices improves
A)noise
B)spatial resolution
C)contrast resolution
D)All of the above
Q2) Children require special considerations in CT imaging because
A)Children are more sensitive to the effects of radiation and have more years for problems to manifest
B)Children require the use of routine pediatric protocols based either on age or weight
C)Children should receive alternative procedures without ionizing radiation
D)All of the above
Q3) This advancement has the tube rotating inside the gantry while the patient and table move through the gantry in a continuous motion.
A)Spiral CT
B)Multislice CT
C)Slip-ring technology
D)Cone beam
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