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SAM final > Radiobiology test 1 > Flashcards

Radiobiology test 1 Flashcards

1
Q
  1. Which statement is false?
    a. The generator determines the capacity of the x-ray machine.
    b. Greater capacity allows shorter exposure time.
    c. Reduction of the exposure time will increase the motion unsharpness
    d. The most common reason for motion unsharpness is panting.
A

c. Reduction of the exposure time will increase the motion unsharpness

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2
Q
  1. What is the role of the collimator?
    a. Filtration of the scattered beams
    b. Setting the size of the x-ray beam
    c. Setting the strength of the x-ray beam
    d. Reduction of x-ray radiation
A

b. Setting the size of the x-ray beam

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3
Q
  1. Which one is not an exposure factor?
    a. kV
    b. mA
    c. kW
    d. s
A

c. kW

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4
Q
  1. Which statement is false?
    a. The kVp describes the strength (penetrating power) of the x-ray beam.
    b. The mA describes the number of x-ray photons
    c. To maintaine the same exposure, if increasing the mAs you have to elevate the kVp too.
    d. The same mAs can be created from different time components
A

c. To maintaine the same exposure, if increasing the mAs you have to elevate the kVp too.

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5
Q
  1. What is the normal range of tube voltage in small animal radiography?
    a. 0,1-2 kVp
    b. 1000-2000 kVp
    c. 40-100 kVp
    d. 4-10 kVp
A

c. 40-100 kVp

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6
Q
  1. Which statement is true?
    a. Some digital technologies use x-ray films.
    b. Fluoroscopy can be digital or analog.
    c. DR systems can be digital or analog.
    d. The picture of CR systems can be static or dynamic.
A

b. Fluoroscopy can be digital or analog.

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7
Q
  1. Which statement is true? The use of the grid
    a. reduces the radiation exposure
    b. improves the image contrast
    c. improves the image sharpness
    d. reduces the exposure time
A

b. improves the image contrast

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8
Q
  1. What is not a normal component of an indirect digital system (CR)?
    a. x-ray tube
    b. x-ray film
    c. collimator
    d. PSP plate
A

b. x-ray film

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9
Q
  1. Which statement is false?
    a. The x-ray radiation is electromagnetic radiation.
    b. X-ray beams cannot be deflected by a magnetic field.
    c. Particles with higher energy have a higher penetrating power.
    d. The elementary unit of the x-ray beam is the electron.
A

d. The elementary unit of the x-ray beam is the electron.

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10
Q
  1. Which statement is true ?
    a. Fluoroscopy causes very low radiation exposure.
    b. Fluoroscopy is mainly used for static examinations.
    c. During fluoroscopy the x-ray tube is generally above the animal.
    d. Fluoroscope is also called C-arm
A

Fluoroscopy causes very low radiation exposure.

d. Fluoroscope is also called C-arm

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11
Q
  1. The negatively charged particle of an atom is the:
    a. proton.
    b. neutron.
    c. electron.
    d. nucleus.
A

c. electron.

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12
Q
  1. As x-rays pass through materials, they have the ability to:
    a. cause some substances to fluoresce (emit visible light)
    b. completely remove an electron from an atom, leaving the atom positively charged.
    c. cause chemical changes that can kill cells.
    d. all of the above..
A

d. all of the above.

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13
Q
  1. Which of the following statements is true?

a. X-rays can be deflected by magnetic fields.
b. X-rays with longer wavelengths penetrate farther than rays with shorter wavelengths.
c. Electromagnetic radiation with higher frequency has more penetrating power through space and matter.
d. Gamma rays are required for the production of a radiograph.

A

c. Electromagnetic radiation with higher frequency has more penetrating power through space and matter.

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14
Q
  1. Electrons travel:
    a. Toward the cathode in an x-ray tube
    b. Away from the anode in an x-ray tube
    c. Toward the anode in an x-ray tube
    d. None of them is true
A

c. Toward the anode in an x-ray tube

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15
Q
  1. X-ray photons travel:
    a. toward the cathode in an x-ray tube.
    b. away from the anode in an x-ray tube.
    c. toward the anode in an x-ray tube.
    d. None of them is true.
A

b. away from the anode in an x-ray tube

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16
Q
  1. Ways to increase penetrating power of x-rays include:
    a. increasing kVp.
    b. increasing the time setting.
    c. increasing thermionic emission.
    d. increasing mAs.
A

a. increasing kVp.

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17
Q
  1. The milliamperage-seconds (mAs) for 100 mA and 1/10 sec is:
    a. 10 mAs
    b. 10000 mAs
    c. 100 mAs
    d. 1mAs
A

a. 10 mAs

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18
Q
  1. According to Santes􏰎 rule, if a cats abdomen measures 8 cm, FFD is 100 cm, kVp is:
    a. 72
    b. 56
    c. 66
    d. 52
A

b. 56

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19
Q
  1. Increasing the film-object distance:
    a. The resulting image will be larger.
    b. The resulting image will be sharper.
    c. The resulting image will be distorted.
    d. Both a and b is correct.
A

a. The resulting image will be larger.

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20
Q
  1. One percent of the energy produced at the anode is in the form of
    a. heat
    b. x-rays
    c. light
    d. none of the above.
A

b. x-rays

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21
Q
  1. The temperature of the filament within the cathode is controlled by:
    a. time setting.
    b. the source-image distance.
    c. kVp setting.
    d. mA setting.
A

a. time setting.

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22
Q
  1. Which is a characteristic of x-rays?
    a. Their total number produced is determined by kV
    b. Longer wavelengths have more penetrating power.
    c. Their intensity increases as SID (source-image distance) decreases.
    d. They diverge from a light source.
A

c. Their intensity increases as SID (source-image distance) decreases.

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23
Q
  1. The potential difference between the anode and cathode is measured in
    a. kilovolts
    b. kilowatts
    c. milliamperes
    d. centimeters
A

a. kilovolts

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24
Q
  1. Higher kVp settings allows for a ___ mAs and ___exposure time.
    a. higher, higher
    b. higher, lower
    c. lower, lower
    d. higher, higher
A

c. lower, lower

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25
Q
  1. Which of the following increases radiographic density?
    a. thinner body parts
    b. increased mAs
    c. increased density of the bodypart being radiographed
    d. decreased kVp
A

a. thinner body parts

b. increased mAs

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26
Q
  1. Which of the following radiographs should have the shortest scale of contrast?
    a. abdomen
    b. thorax
    c. femur
    d. all are approximately equal
A

d. femur

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27
Q
  1. The primary exposure factor that controls scatter radiation is
    a. kVp
    b. mAs
    c. increased exposure time
    d. the collimator setting
A

d. the collimator setting

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28
Q
  1. What do grids contain that controls scatter radiation?
    a. Molybdenum
    b. Aluminium
    c. Silver
    d. Lead
A

d. Lead

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29
Q
  1. Where is a grid located?
    a. between the patient and the cassette
    b. between the patient and the x-ray tube
    c. above the x-ray tube
    d. under the cassette
A

a. between the patient and the cassette

30
Q

To prevent magnification and distortion of the object being radiographed, the patient must..

a. be as parallel to the film as possible
b. be as close to the film as possible
c. be as close to the x-ray tube as possible
d. both a and b are correct

A

a. be as parallel to the film as possible

31
Q
  1. When viewing a radiograph over laterally positioned animal
    a. the head should be at the top of the viewbox /display
    b) the head should face the viewer´s left with this spine at the top
    C) the head shoot face the viwers right the spine at the top
    d) the head should face the viewers left hte spine at the bottom
A

b) the head should face the viewer´s left with this spine at the top

32
Q

Any body part exceeding this measurement requires the use of a grid to reduce fog producing scatter radiation

a. 20cm
b. 10cm
c. 2.5 cm
d. 30cm

A

b. 10cm

33
Q
  1. Which statement is false?
    a. The use of grid is recommended over 10 cm object diameter.
    b. Using a grid, the dose of the radiation should be reduced
    c. The grid filters the scatter radiation
    d. The grid contains small lead strips standing vertically or in an angle facing toward the x-ray tube.
A

b. Using a grid, the dose of the radiation should be reduced

34
Q
  1. Which statement is false? The scattered beam
    a. is negligible concerning radiation safety of the staff
    b. originates mostly from the patient body
    c. is disadvantageous concerning the quality of the radiograph
    d. is less intense than the primary beam
A

a. is negligible concerning radiation safety of the staff

35
Q
  1. Which statement is false? The x-ray beam is

a. invisible
b. makes chemical changes in photoemulsions
c. produces light flash in fluorescent materials
d. penetrates bodies without losing energy

A

d. penetrates bodies without losing energy

36
Q
  1. Which one does not belong to the basic radiographic opacities
    a. metal
    b. wood
    c. stone
    d. gas
A

b. wood

37
Q
  1. With the use of a grid we can
    a. reduce the radiation exposure
    b. improve the image contrast
    c. improve the image sharpness
    d. reduce the exposure time
A

b. improve the image contrast

38
Q
  1. Which statement is incorrect? The x-ray (is)…
    a. ionizing radiation.
    b. electromagnetic radiation.
    c. travels at the speed of light.
    d. consists of charged particles.
A

d. consists of charged particles

39
Q
  1. What is not a normal component in the digital radiographic technology?
    a. x-ray tube
    b. intensifying screen
    c. grid
    d. collimator
A

b. intensifying screen

40
Q
  1. The attenuation of the X-ray beam does not depend on which parameter?
    a. atomic number
    b. object thickness
    c. physical density
    d. optical density
A

d. optical density

41
Q
  1. Which components are different in conventional and digital radiography?
    a. x-ray tube
    b. generator
    c. grid
    d. detector
A

d. detector

42
Q
  1. What is the main source of the radiation exposure of the personnel ?
    a. leaking radiation from the x-ray tube
    b. the primary beam
    c. the secondary beam originating from the patient
    d. none of them
A

c. the secondary beam originating from the patient

43
Q
  1. Which statement is false ?
    a. bones are more radiolucent than metals
    b. fat is more radiopaque than fluids
    c. gas is more radiolucent than fat
    d. fluids and soft tissues have the same opacity
A

b. fat is more radiopaque than fluids

44
Q

What is not a normal component of an indirect digital system (CR)?

a. x-ray tube
b. x-ray film
c. collimator
d. PSP plate

A

c. x-ray film

45
Q
  1. The cause of an unsharp x-ray image cannot be:

a. motion
b. increased distance between the object and the detector
c. low kV
d. high mAs

A

d. high mAs

46
Q

Which statement is true regarding the radiographic image?

a. The distortion is less on the periphery.
b. Distortion can be prevented by centralization.
c. Objects look smaller on radiograph then their real size.
d. Unsharpness may come only from motion.

A

b. Distortion can be prevented by centralization.

47
Q

Which statement is true?

a. Image acquisition is faster in CR, than in DR systems
b. CR systems are cheaper, than DR systems
c. In the DR systems the cassette contains a PSP plate
d. A reader or scanner is a normal component of a DR system

A

b. CR systems are cheaper, than DR systems

48
Q

Which exposure facture could be used in small animal radiography ?

a. 8mAs
b. 100 mAs
c. 0,8 mAs
d. 800 mAs

A

a. 8mAs

49
Q
  1. Which statement is false?

a. The mAs describes the number of x-ray photons
b. Higher capacity generators are required to produce longer exposure time .
c. The contrast of the image is mainly based on the mAs .
d. Scatter radiation is mainly based on mAs .

A

d. Scatter radiation is mainly based on mAs .

50
Q
  1. Which statement is false? In case of a chest radiograph
    a. Longer exposure time is recommended
    b. Smaller exposure values are needed compared to and abdominal radiograph of the same diameter
    c. The contrast will be higher compared to the abdomen
    d. Motion unsharpness is a common problem
A

a. Longer exposure time is recommended

51
Q
  1. Which exposure factors cause same blackening on the detector than 60kV/8mAs?
    a. 70 kV/ 16 mAs
    b. 50 kV/ 20 mAs
    c. 80kV/2mAs
    d. 40 kV/ 10 mAs
A

c. 80kV/2mAs

52
Q
  1. Which of the following is not an image parameter ?
    a. density
    b. sharpness
    c. magnification
    d. contrast
A

c. magnification

53
Q
  1. Which statement is true ?
    a. the overexposed digital image will be too bright.
    b. the overexposed analog image will be too dark.
    c. the underexposed analog image will be too dark.
    d. the under exposed digital image will be too bright.
A

b. the overexposed analog image will be too dark.

d. the under exposed digital image will be too bright.

54
Q

Which statement is false ?

a. in case of wrong exposure factors the digital image will be motten.
b. The S-value informs you about the exposure
c. The image can be motten both in over- and underexposed cases
d. Digital systems require much higher doses than analog systems .

A

d. Digital systems require much higher doses than analog systems .

55
Q
  1. Which statement is true ?
    a. You don’t have to use grid for the chest .
    b. You don’t have to use grid about 10 centimeter object thickness .
    c. The use of the grid is often not required in digital systems
    d. The create improves the image sharpness
A

c. The use of the grid is often not required in digital systems

56
Q
  1. The opacity of which organ differs from the others ?
    a. Urinary bladder
    b. Gallbladder
    c. Trachea.
    d. Heart
A

Trachea

57
Q
  1. One of the following is NOT a form of protection against ionizing radiation
    a. distance
    b. shielding
    c. dose equivalent
    d. time
A

d. time

58
Q
  1. A personal dose meter is
    a. worn on the outer side of protective clothing
    b. is obligatory for everybody
    c. indicates overexposure with light and sound signal
    d. records the effective dose
A

d. records the effective dose

59
Q
  1. The X-ray beam does NOT
    a. cause radioactivity
    b. ionize matter
    c. travel at the speed of light
    d. require electric current to generate
A

a. cause radioactivity

60
Q
  1. In veterinary diagnostic radiology adverse may include
    a. stochastic effects
    b. deterministic effects
    c. radiation sickness
    d. none
A

a. stochastic effects

61
Q
  1. An especially sensitive tissue type for ionizing radiation is
    a. the skin
    b. the bone marrow
    c. the nervous system
    d. none
A

b. the bone marrow

62
Q
  1. In case of deterministic effects
    a. severity is proportionate to dose
    b. there is no threshold
    c. the typical unit of measure is Sievert
    d. the most common result is a malignant tumour
A

a. severity is proportionate to dose

63
Q
  1. It is officially safe to put a hand in the primary X-ray beam with

a. lead gloves on
b. with nothing on
c. with a double layer of protective lead on
d. none of the above

A

d. none of the above

64
Q
  1. Radon
    a. is incorporated after inhalation
    b. is released from industrial fallout
    c. is generated by X-ray
    d. is absent in Europe
A

b. is released from industrial fallout

65
Q
  1. X-ray photons in the body normally are NOT
    a. absorbed
    b. reflected
    c. scattered
    d. transmitted
A

d. transmitted

66
Q
  1. Why can be a structure more radiopaque than the other?
    a. It has the same diameter, but it consists of elements of lower atomic numbers
    b. it has the same material. but it’s thinner
    c. it consists of elements of higher atomic number and has the same diameter
    d. it consists of elements of smaller atomic number and it is thinner
A

c. it consists of elements of higher atomic number and has the same diameter

67
Q
  1. Which statement is false?
    a. The canine tooth is located rostral to the tympanic bulla.
    b. The patella is located cranial to the fabella.
    c. The sternum is located ventral to the heart.
    d. The olecranon is located dorsal to the carpus
A

d. The olecranon is located dorsal to the carpus

68
Q
  1. What if the object is not in the center of the detector plate?

a. The resulting image will be enlarged.
b. The resulting image will be distorted.
c. The resulting image will be unsharp.
d. The resulting image will be overexposed.

A

c. The resulting image will be unsharp.

69
Q
  1. Which statement is true?
    a. You can’t reach into the primary beam even with lead gloves on.
    b. The land club protects from the primary beam.
    c. If you don’t see the bones of your gloved hand on the radiograph, then no radiation was exposed to your hand.
    d. Only pregnant women can’t reach into the primary beam.
A

b. The land club protects from the primary beam.

c. If you don’t see the bones of your gloved hand on the radiograph, then no radiation was exposed to your hand.

70
Q
  1. What does 􏰔acquisition􏰕 mean in digital imaging?
    a. The clouding of electrons around the cathode spiral.
    b. The scatter of primary beams around the 􏰇􏰄􏰃􏰈􏰇􏰆􏰎􏰏 body.
    c. The creation of picture from the electric sign.
    d. The equilibrium of exposure factors to optimize the image quality.
A

c. The creation of picture from the electric sign.

71
Q
  1. What is not true for DICOM files?
    a. They can be inspected with commercial image viewer programs
    b. Contain images of TIFF format.
    c. The x-ray images have a size of 10-30 megabytes.
    d. They contain metadata besides the image.
A

a. They can be inspected with commercial image viewer programs

72
Q
  1. Which statement is incorrect. Compared to the JPEG image is the DICOM fires are
    a. less appropriate for diagnostics.
    b. bigger.
    c. preferred more by the owner.
    d. cannot be inspected with a medical image viewer program.
A

c. preferred more by the owner.

SAM final (19 decks)

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