Medical Imaging Science
Practice Questions
Course Introduction
Medical Imaging Science explores the principles, technologies, and applications of imaging techniques used in modern medicine for diagnosis and treatment planning. This course provides an overview of major modalities such as X-ray, computed tomography (CT), magnetic resonance imaging (MRI), ultrasound, and nuclear medicine, examining the underlying physics, instrumentation, image formation, and safety considerations for each. Students will learn about image quality, interpretation, and the role of imaging in clinical decision-making, as well as recent advancements such as digital imaging and image analysis. Emphasis is placed on understanding both the technical foundations and the clinical relevance of medical imaging science in healthcare.
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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Page 2
Chapter 1: Introduction to the Imaging Sciences
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76 Verified Questions
76 Flashcards
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Sample Questions
Q1) Who brought attention to the dangers of x-rays?
A)Wilhelm Roentgen.
B)Bertha Roentgen.
C)Crookes.
D)Thomas Edison.
Answer: D
Q2) How much force is needed to move a 30-kg piece of equipment at a rate of 3 m/s²?
A)10 N.
B)30 N.
C)60 N.
D)90 N.
Answer: D
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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3
Chapter 2: Structure of the Atom
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Sample Questions
Q1) The most commonly known modern atomic theory was developed by
A)Bohr
B)Rutherford
C)Dalton
D)Thomson
Answer: A
Q2) 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
Q3) Each element has an unchanging number of protons.
A)True
B)False
Answer: True
Q4) All compounds are molecules and all molecules are compounds.
A)True
B)False
Answer: False
Page 4
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Chapter 3: Electromagnetic and Particulate Radiation
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58 Flashcards
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Sample Questions
Q1) Electromagnetic theory was developed in the late 1800s by A)Bohr
B)Rutherford
C)Maxwell
D)Planck
Answer: C
Q2) The inverse square law relates the intensity (of light/x-rays)to A)velocity
B)time
C)mass
D)distance
Answer: D
Q3) Which of the following is not part of the electromagnetic spectrum?
A)Visible light.
B)Microwaves.
C)Sound.
D)Gamma rays.
Answer: C
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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 device that converts electrical energy to mechanical energy is a A)motor
B)transformer
C)generator
D)electromagnet
Q2) The number of turns on the primary and secondary sides of the step-down transformer can be adjusted to control the current to the filaments.
A)True
B)False
Q3) The lines of force in space associated with a magnet are called
A)lines of flux
B)dipoles
C)domains
D)lines of field
Q4) If a conductor is curved,the greatest amount of charge will be found
A)at the beginning of the conductor
B)at the end of the conductor
C)at the area of the greatest curvature of the conductor
D)along the straightest area of the conductor
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Chapter 5: The X-Ray Tube
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110 Flashcards
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Sample Questions
Q1) Which of the following occurs last during x-ray production?
A)Kilovoltage is applied to anode and cathode.
B)Thermionic emission.
C)AC is converted to Dc.
D)The rotor starts turning.
Q2) Glass enclosures are typically made of borosilicate glass (Pyrex)because
A)it is an inexpensive material
B)it is an expensive material
C)it is very heat-resistant
D)none of the above
Q3) Molybdenum
A)is an excellent conductor of electricity
B)is a poor conductor of electricity
C)is an excellent thermal conductor
D)is a poor thermal conductor
Q4) The purpose of the focusing cup is to
A)produce thermionic emission from the filament
B)prevent thermionic emission from the filament
C)allow the electrons to spread out
D)keep the electrons together
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Chapter 6: X-Ray Production
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72 Flashcards
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Sample Questions
Q1) How many HVLs are needed to reduce beam intensity from 600 mR to 300 mR?
A)One.
B)Two.
C)Three.
D)Four.
Q2) During x-ray production the electrons penetrate the target approximately
A)0.2 mm
B)0.5 mm
C)2 mm
D)5 mm
Q3) If kVp is doubled,the quantity of radiation increases by a factor of A)2
B)3
C)4
D)8
Q4) Filtration placed in the path of the x-ray beam
A)absorbs low-energy photons
B)absorbs high-energy photons
C)increases patient dose
D)reduces the quantity of radiation by a factor of 2
Page 8
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Chapter 7: X-Ray Interactions With Matter
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66 Flashcards
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Sample Questions
Q1) The greater the absorption of radiation
A)the greater the differential absorption
B)the better the image quality
C)the greater the patient dose
D)all of the above
Q2) Compton scattering involves the x-ray photon
A)being absorbed in the atom
B)removing an inner-shell electron
C)removing a middle- or outer-shell electron
D)passing through the atom without any change
Q3) The effect of classical scatter interactions on image quality
A)is significant
B)is minimal
C)is that quality is improved
D)B and C
Q4) Air is considered:
A)radiopaque
B)hard to penetrate
C)radiolucent
D)more likely to absorb radiation
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Chapter 8: Image Production
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66 Flashcards
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Sample Questions
Q1) Photoelectric interactions occur only at the lower end of the diagnostic range of photon energies.
A)True
B)False
Q2) Transmission refers to
A)all x-rays in the beam before entering the patient
B)x-rays leaving the patient that did not interact with atoms
C)all x-rays leaving the patient
D)the process of sending the x-ray beam through the patient
Q3) For every 4-5 cm of tissue,the x-ray beam quantity is reduced by approximately
A)10%
B)25%
C)50%
D)75%
Q4) 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
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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) When the actual exposure doubles (for example from 10 mAs to 20 mAs),the log relative exposure increases by
A)0.2
B)0.3
C)2
D)3
Q2) The intensity of exposure is measured in
A)mAs
B)mR
C)log relative exposure
D)kVp
Q3) The distance from the center of one pixel to the center of the one next to it is
A)grayscale
B)pixel pitch
C)pixel density
D)contrast resolution
Q4) Characteristic and H&D are other terms for sensitometric curves.
A)True
B)False
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Chapter 10: Radiographic Exposure Technique
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135 Verified Questions
135 Flashcards
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Sample Questions
Q1) The small focal spot should be used with every examination to produce the best recorded detail and spatial resolution.
A)True
B)False
Q2) As compared with film-screen,digital image receptors depend more on mAs.
A)True
B)False
Q3) Focal spot size is determined by
A)the amount of kVp
B)cathode filament size
C)cathode focusing cup size
D)all of the above
Q4) With digital imaging,if the image receptor is not exposed to enough radiation
A)the image brightness will appear low (dark)
B)the image brightness will appear appropriate
C)the image brightness will appear high (light)
D)none of the above
Q5) Shape distortion is only due to misalignment of the tube or part.
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) The Moiré effect can be caused by
A)using a grid with a frequency similar to the CR laser scanning frequency
B)using a focused grid upside down in the bucky
C)using a grid cassette in the bucky
D)A and C
E)B and C
Q2) The grid limits the amount of scatter radiation produced in the patient.
A)True
B)False
Q3) The reason the grid in the bucky reciprocates is to
A)absorb more scatter radiation
B)allow more transmitted radiation to reach the IR
C)blur out the grid lines
D)all of the above
Q4) The material between the lead strips of a grid must be
A)radiopaque
B)radiolucent
C)made of lead
D)made of tungsten
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Chapter 12: Image Receptors
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176 Flashcards
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Sample Questions
Q1) When the processor is not being used,_______________ stops the rollers from turning.It needs to be activated when it is time to start processing again
A)recirculation
B)the feed tray
C)the standby control
D)replenishment
Q2) As the number of silver halide crystals increases,speed ____________
A)increases
B)decreases
C)stays the same
Q3) A material that absorbs x-ray energy and emits visible light in response is a
A)charge-coupled device (CCD)
B)photoconductor
C)thin film transistor (TFT)
D)scintillator
Q4) As the matrix size increases,the pixel size
A)increases
B)decreases
C)remains the same
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Chapter 13: Exposure Technique Selection
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Sample Questions
Q1) When there is a significant amount of scatter radiation reaching the detector,the exposure time will
A)be shorter than needed
B)be appropriate
C)be longer than needed
Q2) The two types of detectors used in AEC are
A)image intensifiers and phototimers
B)phototimers and ionization chambers
C)ionization chambers and Geiger counters
D)direct and indirect capture
Q3) The primary purpose of AEC is to
A)reduce patient exposure
B)control the amount of radiation reaching the IR
C)control image contrast
D)eliminate the need for the radiographer to think critically
Q4) There is typically a configuration of at least _________ AEC detectors in place
A)2
B)3
C)4
D)5
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) Each capacitor in a CCD represents a(n)
A)line
B)image
C)pixel
D)electric charge
Q2) If the input phosphor measures 30 cm and the output phosphor measures 2.5 cm,what is the minification gain?
A)8.3
B)12
C)69.2
D)144
Q3) Digital fluoroscopy is improved by using
A)a vidicon camera
B)videotape
C)a beam-splitting mirror
D)a charge-coupling device (CCD)
Q4) The ABC can be slow in responding,seen as a brief delay in the brightness adjustment.
A)True
B)False
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Chapter 15: Additional Equipment
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53 Flashcards
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Sample Questions
Q1) Mammography uses a ___________ exposure.
A)low kVp
B)mid-range kVp
C)high kVp
D)low mAs
Q2) The battery-powered mobile radiographic unit produces consistent radiation output,similar to a single-phase generator.
A)True
B)False
Q3) To produce a thin tomographic section,there needs to be a
A)low fulcrum level
B)high fulcrum level
C)small tomographic angle
D)large tomographic angle
Q4) Linear tomography is used to overcome the limitation that some anatomic areas are difficult to see because they are superimposed by other structures.
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) The CT number is the same as an attenuation coefficient
A)True
B)False
Q2) This collimator is located between the tube and the patient
A)Prepatient collimator
B)Postpatient collimator
C)Bowtie filter
D)A and B
Q3) The collimator that limits the patient's radiation exposure is the
A)prepatient collimator
B)postpatient collimator
C)bow tie filter
D)A and B
Q4) The CT number of water is
A)0
B)greater than 0
C)less than 0
D)unable to determine unless more is known
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Page 18