Radiographic Imaging Principles
Exam Answer Key
Course Introduction
Radiographic Imaging Principles introduces students to the foundational concepts and techniques used in medical imaging, with an emphasis on the physics of x-ray production, image formation, and the factors affecting image quality. The course explores topics such as image receptor systems, contrast, resolution, exposure variables, and patient positioning, as well as radiation safety and protection protocols. Students will develop an understanding of how equipment operation and technical choices influence diagnostic outcomes, enabling them to apply best practices in a clinical radiographic setting.
Recommended Textbook
Essentials of Radiographic Physics and Imaging 1st Edition by James Johnston
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16 Chapters
1558 Verified Questions
1558 Flashcards
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Chapter 1: Introduction to the Imaging Sciences
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75 Verified Questions
75 Flashcards
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Sample Questions
Q1) To help dissipate the heat produced during x-ray production,the x-ray tube housing is filled with:
A) air
B) water
C) refrigerant
D) oil
Answer: D
Q2) The tube head assembly consists of:
A) x-ray tube
B) tube stand
C) collimator
D) all of the above
Answer: D
Q3) Who brought attention to the dangers of x-rays?
A) Wilhelm Roentgen
B) Bertha Roentgen
C) Crookes
D) Thomas Edison
Answer: D
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Page 3
Chapter 2: Structure of the Atom
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Sample Questions
Q1) If an atom has the same number of electrons and protons it will:
A) have a negative charge
B) have a positive charge
C) be electrically neutral
D) none of the above
Answer: C
Q2) If a particle strikes an atom with the same amount of energy as the atom's binding energy:
A) the atom will become a positive ion
B) the atom will become a negative ion
C) it can split the atom
D) it can fuse the atom
Answer: C
Q3) An atom of helium ( He)has:
A) two protons
B) four protons
C) four neutrons
D) four electrons
Answer: A
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Page 4
Chapter 3: Electromagnetic and Particulate Radiation
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Sample Questions
Q1) All radioactive elements occur naturally.
A)True
B)False
Answer: False
Q2) The formula v = fl can be used to calculate the ______________ and ____________ of an electromagnetic wave.
A) velocity;wavelength
B) wavelength;frequency
C) frequency;velocity
D) all of the above
Answer: B
Q3) What is the wavelength of electromagnetic radiation if the frequency is 3 × 10¹ m?
A) 1 × 10-2 m
B) 1 × 102 m
C) 3 × 10-2 m
D) 3 × 102 m
Answer: A
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Chapter 4: X-Ray Circuit
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Sample Questions
Q1) The property of a circuit that impedes the flow of electrons is:
A) electric current
B) electric potential
C) resistance
D) electrostatics
Q2) The selection of the large or small filament in the cathode depends on the choice of focal spot size at the operating console and the:
A) exposure time selected
B) kVp selected
C) mA station selected
D) all of the above
Q3) Slowing down the speed at which the conductor passes through the magnetic field results in:
A) increased electromagnetic induction
B) reduced electromagnetic induction
C) no effect on electromagnetic induction
Q4) Three-phase power has less than 1% ripple.
A)True
B)False
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Chapter 5: The X-Ray Tube
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Sample Questions
Q1) Based on the anode heel effect,an image taken at 40 inches SID.may demonstrate:
A) decreased exposure toward the anode end of the beam
B) decreased exposure toward the cathode end of the beam
C) decreased exposure toward the left side of the beam
D) decreased exposure toward the right side of the beam
Q2) The most common x-ray tube target angle is:
A) 2 degrees
B) 8 degrees
C) 12 degrees
D) 18 degrees
Q3) In addition to the oil surrounding the tube,mechanical fans help to eliminate the heat produced during x-ray production.
A)True
B)False
Q4) By regulation,x-ray tube leakage radiation can be no more than:
A) 100 R per hour
B) 100 R per minute
C) 100 mR per hour
D) 100 mR per minute
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Chapter 6: X-Ray Production
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Sample Questions
Q1) Which of the following is the primary factor controlling quantity?
A) kVp
B) mAs
C) distance
D) filtration
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 65-keV filament electron is not able to produce characteristic radiation.
A)True
B)False
Q4) During x-ray production the electrons penetrate the target approximately:
A) 0.2 mm
B) 0.5 mm
C) 2 mm
D) 5 mm
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Chapter 7: X-Ray Interactions With Matter
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Sample Questions
Q1) Photoelectric interactions are more likely to occur in:
A) air
B) soft tissue
C) bone
D) they occur equally in all types of tissues
Q2) Photodisintegration occurs when the incident photon interacts with:
A) an inner-shell electron
B) an outer-shell electron
C) inner- and outer-shell electrons
D) the nucleus of the atom
Q3) As a result of pair production,a(n)______________ and a(n)______________ are produced.
A) electron;positron
B) electron;proton
C) proton;neutron
D) neutron;electron
Q4) The probability of a photoelectric interaction depends on the atomic number of the atom.
A)True
B)False
Page 9
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Chapter 8: Image Production
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Sample Questions
Q1) Chemical processing is used to create the manifest image in:
A) film-screen imaging
B) digital imaging
C) film-screen and digital imaging
Q2) Before processing,the image receptor has a(n)__________ image.
A) latent
B) visible
C) invisible
D) A and C
Q3) Attenuation of the x-ray beam in the diagnostic range is due to:
A) absorption
B) scattering
C) transmission
D) A and B
Q4) Scatter radiation that reaches the image receptor creates:
A) unwanted density
B) useful information
C) fog
D) A and C
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Chapter 9: Image Characteristics
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Sample Questions
Q1) The range of densities visible defines:
A) density
B) high contrast
C) short-scale contrast
D) scale of contrast
Q2) Additional exposure after the curve reaches Dm results in:
A) higher contrast
B) lower contrast
C) increased density
D) decreased density
Q3) A line pair is made up of:
A) a line
B) two lines
C) a space
D) A and C
Q4) With film-screen,the overall blackness produced on the processed image is:
A) a geometric property
B) a photographic property
C) radiographic density
D) B and C
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Chapter 10: Radiographic Exposure Technique
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Sample Questions
Q1) The only factor that affects exposure to the image receptor,size distortion,and image contrast is:
A) SID
B) mAs
C) focal spot size
D) OID
Q2) Increasing the kVp:
A) increases the energy of the x-ray photons
B) increases the quantity of x-ray photons
C) increases the penetrating power of x-ray photons
D) all of the above
Q3) Which of the following is the correct formula for the mAs/distance compensation formula?
A) mAs /mAs = SID /SID
B) mAs /mAs = SID /SID
C) mAs /mAs = (SID )²/(SID )²
D) mAs /mAs = (SID )²/(SID )²
Q4) Using a technique chart can significantly reduce patient exposure.
A)True
B)False
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Chapter 11: Scatter Control
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Sample Questions
Q1) The Moiré effect is also known as the _________ pattern.
A) cheetah
B) giraffe
C) lion
D) zebra
Q2) A linear grid:
A) has lead strips that cross each other
B) has lead strips that travel in one direction
C) is the most common type of radiographic grid
D) B and C
Q3) Decreasing collimation (opening up the field size)results in:
A) increased scatter production and higher contrast
B) increased scatter production and lower contrast
C) decreased scatter production and higher contrast
D) decreased scatter production and lower contrast
Q4) The grid limits the amount of scatter radiation produced in the patient.
A)True
B)False
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Chapter 12: Image Receptors
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Sample Questions
Q1) Using blue-sensitive film with green light-emitting screens is an example of poor:
A) spectral matching
B) spectral sensitivity
C) spectral emission
D) B and C
Q2) Reducing agents are found in the:
A) developer
B) dryer
C) fixer
D) none of the above
Q3) Orthochromatic film is sensitive to:
A) blue light
B) green light
C) red light
D) none of the above
Q4) The wall between a radiographic room and the darkroom should be lined with lead.
A)True
B)False
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Page 14
Chapter 13: Automatic Exposure Control
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Sample Questions
Q1) If the radiographer is doing an upright chest using AEC but the table bucky is selected:
A) the back-up time will be reached
B) the patient will be exposed to excessive radiation
C) the IR will be overexposed
D) all of the above
Q2) Anatomically programmed radiography (APR)is a system in which the radiographer selects:
A) AEC settings
B) mAs and kVp settings
C) preset settings based on the part being imaged
D) preset settings based on the size of the patient
Q3) With digital imaging using AEC,if an AP thoracic spine is imaged with the central ray passing 3 inches to the right of the spine,the brightness in the area of interest is __________________ and the exposure time is ________________________.(Assume all other factors are appropriate. )
A) light;long
B) light;short
C) appropriate;short
D) dark;long
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Chapter 14: Image Intensified Fluoroscopy
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Sample Questions
Q1) A disadvantage of using magnification mode during fluoroscopy is:
A) the image has less resolution
B) the image brightness is inconsistent
C) the patient receives additional dose
D) none of the above
Q2) The potential difference across the image intensifier is approximately:
A) 25 V
B) 250 V
C) 25 kV
D) 250 kV
Q3) The electron gun in the monitor moves in the same ___________ pattern as did the electron gun in the camera.
A) sweep
B) brush
C) raster
D) rooster
Q4) Which of the following produces an image with more noise?
A) video camera
B) CCD
C) there is no difference between the two
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Chapter 15: Additional Equipment
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Sample Questions
Q1) The radiation dose to the breast ______________________ when magnification techniques are used.
A) is lower
B) is higher
C) remains the same
Q2) The arc created by the total movement of the tube during tomography is the:
A) tomographic amplitude
B) exposure amplitude
C) fulcrum
D) focal plane
Q3) Mammography uses a ___________ exposure.
A) low kVp
B) mid-range kVp
C) high kVp
D) low mAs
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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Sample Questions
Q1) This translate-rotate scanner used a single detector.
A) first generation
B) second generation
C) third generation
D) fourth generation
Q2) Noise can be reduced by using a:
A) lower pitch
B) higher pitch
C) shorter rotation time
D) none of the above
Q3) Structures such as the breast or thyroid cannot be shielded when they are in the SFOV because an artifact would be created.
A)True
B)False
Q4) Automatic tube current modulation is a method:
A) to reduce patient exposure
B) to improve image quality
C) similar to automatic exposure control
D) A and C
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