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Radiology > Jerica's Radiology Final > Flashcards

Jerica's Radiology Final Flashcards

1
Q

The function of the collimator on the x-ray machine includes all of the following except:

reduces the radiation and therefore the volume of irriadiated tissue
reduces the size of the xray beam
reduces the amount of soft radiation

A

reduces the amount of soft radiation

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2
Q

The purpose of a filter in the tubehead is to:

A

filter the long wavelength radiation

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3
Q

The term for the type of switch on the x-ray machine for actually exposing the film to radiation is called a “dead man” switch because:

A

The radiation is terminated if pressure is not kept on the switch at all times

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4
Q

Electrons are created at the filament of the cathode when the filament is heated to incandescence. This process is known as:

A

thermionic emission

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5
Q

Which of these is classified as a semicritcal object?

tube head support arm
film holder
lead apron
treatment chair

A

film holder

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6
Q

All of the following are form of energy except:

light
heat
xradiation
water

A

water

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7
Q

What is the maximum number of electron shells an atom can have?

A

7

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8
Q

Excessive exposure to radiation is reduced by all of the following except:

holding the film in the patient’s mouth
restricting the size of the x-ray beam
safer x-ray machines with shielding
using fast film

A

holding the film in the patient’s mouth

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9
Q

All of the following should be covered with an impervious prior to radiographic procedures except one. Which one is this exception?

PID
exposure switch
treatment chair
film holding device

A

film holding device

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10
Q

All of the following statements about x rays are true except:

travel at the speed of light
travel in convergent lines
have no mass
are invisible

A

travel in convergent lines

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11
Q

The speed of wave

A

velocity

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12
Q

The majority of x rays produced by dental x ray machines are formed by:

A

bremsstrahlung radiation

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13
Q

The greatest exposure to ionizing radiation to the population comes from:

A

background radiation

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14
Q

Which of the following should be used when opening film packets without plastic barrier envelopes?

treatment gloves
over gloves
clean, dry hands
an air-filled glass tube

A

treatment gloves

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15
Q

All of the following conditions must exist for x rays to be produced except:

a target capable of stopping the electrons
a source of free electrons
high voltage to impart speed to the electrons
an air filled glass tube

A

an air filled glass tube

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16
Q

Ordinary household current in the United States is:

A

110-v and 60-cycle AC

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17
Q

Dental x ray machines contain all of the following components except:

automatic processing unit
tube head
extension arm
control panel

A

automatic processing unit

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18
Q

Dental radiographic film has been especially adapted for dental use in all of the following except:

film size
diagnostic clearness
emulsion
film speed

A

diagnostic clearness

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19
Q

The tube head performs all of the following functions except:

prevents overheating of the xray tube
protects the x ray tube from accidental damage
allows non primary beam x rays to escape to prevent pressure build up
incresease the safety of the x ray machine by grounding high voltage components

A

allows non primary beam x rays to escape to prevent pressure build up

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20
Q

All of the following points about the dental x ray machine are correct except:

the x ray tube contains a target capable of stopping the electrons
the control panel may be integrated with the x ray machine tube head supportthe positive anode and the negative cathode are sealed within the x ray tube
the exposure button should be on the end of a three foot timer cord

A

the exposure button should be on the end of a three foot timer cord

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21
Q

The intensity of the x ray beam is affected by all of the following except:

exposure time
kilovoltage
target size
millamperage

A

target size

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22
Q

The PID which most reduces the amount of radiation is the:

A

rectangular

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23
Q

External aiming devices are used in dental x rays because they:

A

allow for more reducible radiograph

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24
Q

The MPD or Maximum Permissable Dose for radiation workers is:

A

one REM per year

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25
Q

How many transformers are used in a dental x ray machine?

A

3

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26
Q

How many electrical circuits are used in a dental x ray machine?

A

2

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27
Q

MAD is figured as the operators age minus 18 times:

A

5

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28
Q

Federal government regulation of the manufacture and installation of dental x ray machines occurred in what year?

A

1974

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29
Q

Greatest sensitivity to radiation

A

F speed

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30
Q

Actively dividing cells are more sensitive to radiation than more slowly dividing cells. The more specialized the cell the less sensitive the cell is to radiation. This theory of cell susceptability is known as:

A

Law of B and T

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31
Q

All of the following is true regarding ionization except:

ionization is the gain or loss of electrons
ionization is the formation of ion pairs
ionizing radiation is any radiation that causes ion pairs
ionizing particulates are never naturally occuring

A

ionizing particulates are never naturally occuring

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32
Q

When pure energy causes electrons to fly off in all directions until it uses up all the energy and dissipates or disappears occuring approximately 30% of the time, it is known as:

A

photoelectric effect

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33
Q

The Systeme Internationale (SI) units of measure are:

A

Coulombs per kilogram, grays, sieverts

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34
Q

The term radiopaque refers to the portion of the processed image that is:

A

white

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35
Q

A somatic effect occurs after radiation exposure when:

A

the biologic change occurs in the individual but not the offspring

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36
Q

What metal is used for the focusing cup of the cathode?

A

molybdenum

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37
Q

The electrical pressure sometimes known as the potential difference between two electrical charges is known as:

A

voltage

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38
Q

Acute radiation syndrome ARS symptoms include erythema, nausea, vomitting, diarrhea, hemorrhage, and hair loss. ARS is a particular concern for dental office workers since multiplex ray machines may be present. True or False statements?

A

the first statement is true and the second is false

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39
Q

True or False

Equipment Standards that keep the amount of radiation low includes collimation, filtration, and the use of PID’s

A

True

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40
Q

True or False

the shorter the PID the less the radiation

A

False

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41
Q

True or False

F film is not routinely used because it is slower than E film

A

False

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42
Q

True or False

Long term exposure to radiation can cause statistical increases in the incidence of cancer, increases in birth defects in children, and decreases in genetic mutations

A

False

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43
Q

True or False

We always use a lead apron with a thyroid collar for all dental types of radiographs

A

False

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44
Q

The anode is the negative portion of the tube

A

False

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45
Q

True or False

Radioresistant occurs when dividing and the radio station becomes static due to resistant radio waves

A

False

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46
Q

True or False

The best quality radiograph is achieved with a longer scale which provides a low contrast radiograph

A

False

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47
Q

True or False

The two accepted theories of how radiation damages biologic tissures are the Direct and Indirect theories

A

True

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48
Q

According to the Law of B and T, red blood cells are more sensitive to radiation than heart cells

A

True

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49
Q

Benefits most from a vertical bitewing radiograph rather than horizontal bitewing radiograph

A

Age 25 years, permanent dentition, severe gingival inflammation, generalized probe readings of 5-8mm

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50
Q

With positive vertical angulation, the PID is pointing such thatthe x ray beam will be directed:

A

Down

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51
Q

The coin test may be used to determine:

A

safelight adequacy

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52
Q

A step wedge can be used to test all of the following except one:

x ray unit output
exposure timer
mA setting
processing chemistry

A

processing chemistry

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53
Q

Which of the following is false when generalizations as an aid to film mounting?

maxillary anterior teeth are wider than mandibular anterior teeth
mandibular molars have two roots while maxillary have three
most roots curve mesially
the occlusal plane curves upward in a smile appearance

A

most roots curve mesially is false

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54
Q

All of the following are advantages of film mounting except one?

minimizes misdiagnosis
reduces the chance for film damage
eliminates the need for duplicate radiographs
aids in charting and documentation

A

eliminates the need for duplicate radiographs

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55
Q

The purpose of the lead foil sheet in the film packet is:

A

to protect the film from backscatter radiation

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56
Q

Standard size film

A

Size 2

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57
Q

The speed of a film is determined by the size of the silver halide crystals in the emulsion which means?

A

the larger the crystals, the faster is the film speed

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58
Q

A breakdown of chemicals in the processing solution that results from exposure to air is termed:

A

Oxidation

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59
Q

Unopened boxes of radiographic film should not be stored in the darkroom because:

A

chemical fumes from processing solutions may fog the film

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60
Q

All of the following factors affect the life of the processing solutions except:

number of films processed
care in preparation of solutions
type of safelight filter used
age of solutions
proper care and maintenance of the automatic processor
A

type of safelight filter used

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61
Q

Which of the following are not advantages of the paralleling technique?

increased accuracy
simplicity of use
ease of film placement in all circumstances
ease of duplication

A

ease of film placement in all circumstances

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62
Q

Which of the following definitions is correct?

parallel-always seperated by the same distance
intersecting-to cut through
right angle-formed by two parallel lines
central ray-central portion of the x ray beam

A

right angle formed by two parallel lines

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63
Q

Reticulation occurs when:

A

developer/fixer temperature differences are too great

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64
Q

Which of the following is the correct vertical angulation used with the bitewing technique?

-10 degrees
0 degrees
+10 degrees
varies per patient

A

+10 degrees

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65
Q

The ALARA concept states that every dose of radiation produces some kind of damage and:

A

should be kept to the minimum necessary for diagnoses

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66
Q

Which of the following describes the primary use of the bitewing radiographic technique?

examination of the apical areas of the teeth
examination of the apical and interproximal areas of the teeth
examination of the interproximal area of the teeth and the alveolar crest level
examination of only alveolar crest level

A

examination of interproximal area of teeth and the alveolar crest level

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67
Q

Which of the these films will the dentist most likely prescribe for evaluation of a specific tooth and its surrounding structures?

bitewing
periapical
occlusal
panoramic

A

periapical

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68
Q

Overlapped interproximal spaces results from an error made in:

A

horizontal angulation

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69
Q

When using the bisecting technique, which of these errors results from inadequate vertical angulation? (that is the conehead almost straight)

elongation
foreshortening
cone cut
overlapping

A

elongation

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70
Q

When utilizing the bisecting technique, the film is placed:

parallel to the teeth
as close as possible to the teeth
as close as possible to the bisector line
parallel to the bisector line

A

as close as possible to the teeth

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71
Q

Which utilizing the paralleing technique, the film is place:

parallel to the tooth
as close as possible to the tooth
as close as possible to the bisector
parallel to the bisector

A

parallel to the tooth

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72
Q

A herringbone pattern appears across one end of light film. This indicates:

A

film was placed in backwards in the film holder

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73
Q

Unequal distribution of the arches results from an error made in:

A

vertical angulation

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74
Q

Modification of technique may be required because of:

large tori
shallow palate
patient’s health
all of the above

A

all of the above

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75
Q

The point of entry of the x-ray beam for canines is:

tip of nose
ala of the nose
below the pupil of the eye
outer canthus of the eye

A

ala of the nose

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76
Q

When the PID is tipped upward the angulation is:

zero degrees
parallel to the patient
positive
negative

A

negative

77
Q

Another name for interproximal radiographs is:

periapicals
bitewings
occlusals
panoramics

A

bitewings

78
Q

____ film is longer and more narrow, but only one film needs to be taken for bitewings

0
1
2
3
4
A

3

79
Q

Failure to push the aiming ring in next to cheek before exposing the film results in a radiograph that is:

A

too light

80
Q

Distortion results when:

the film is not parallel to the teeth thus causing the wrong angle for the x-ray beam
x-ray beam is perpendicular to the object and film
using a short object film distance
using a small focal spot

A

the film is not parallel to the teeth thus causing the wrong angle for the x ray beam

81
Q

Dense objects (such as amalgams) absorb the passage of x rays and therefore appear radiolucent on the radiographic image.

True or False?

A

The first statement is true and the second is false

82
Q

Film fog in the darkroom may be caused by:

flurescent lighting afterglow
crack in safelight filter
prolonged exposure to the safelight
any of the above
none of the above
A

any of the above

83
Q

The safelight should be no less than ___ from the work area

2 feet
4 feet
6 feet
8 feet

A

4 feet

84
Q

When mounting a film the dot should:

bubble up
bubble down-depression
be to the top
be to the right side

A

bubble up

85
Q

The purpose of the developer is:

A

to react with silver crystals activated by the x rays within the latent image

86
Q

The purpose of the fixer is to:

A

to remove unreacted silver crystals from the image

87
Q

Dental radiographic film has been especially adapted for dental use in all of the following except:

A

diagnostic clearness

88
Q

An exhausted developing solution will result in a film that is:

too light
too dark
high contrast
fogged

A

too light

89
Q

Replenisher is added to the developing solution to compensate for:

oxidation
loss of volume
loss of solution strength
all of the above

A

all of the above

90
Q

The basic constituents of the developer solution are:

reducing agent, activator, preservative, restrainer
reducing agent, acidifer, preservative, restrainer
clearing agent, activator, preservative, restrainer
clearing agent, preservative, hardener, acidifer

A

reducing agent, activator, preservative, restrainer

91
Q

The emulsion on dental film is composed of all the following except:

gelatin
crystals
silver halide
fluoride salts

A

fluoride salts

92
Q

In manual processing, the optium temperature for the developer is:

A

68 degrees F

93
Q

Film can be processed outside of a darkroom by using:

a dark light proof cloth placed over the hands and film while loading
a specialized light resistant film
a processor with film unwrapping capability
a processor equipped with a daylight loader

A

a processor equipped with a daylight loader

94
Q

The steps in manually processing film in order are:

A

developing, rinsing, fixing, washing, drying

95
Q

The purpose of processing is to do all of the following except:

brings the latent image to a visible state
to take as many radiographs as the insurance company allows
preserve the visible image on a permanent record
have a legal proof of a condition or lack of condition

A

to take as many radiographs as the insurance company allows

96
Q

ALARA

A

as low as reasonably achievable

97
Q

Test 2: Look at bonus #2

A

Snap aray

98
Q

Duplicators use a:

very small 2mA of radiation to the very sensitive duplicator film
built in ultraviolet light and timer
panoramic film that is sent through the processor on slow
none of the above

A

built in ultraviolet light and timer

99
Q

The bisecting technique uses the ____ casting rules

A

shadow casting

100
Q

The bisecting technique uses the ____ casting rules

A

shadow casting

101
Q

When exposing a mandibular periapical radiograph on a patient with a large mandibular tori, where should the film packet be placed?

A

behind the tori

102
Q

A molar periapical radiograph that is undiagnostic due to overlapped interproximal areas is the result of incorrect:

A

horizontal angulation

103
Q

Foreshortening or elongation errors are a result of:

A

vertical angulation

104
Q

A mandibular molar periapical radiograph that did not image the entire second molar results from an error made in which of the following:

packet placement
vertical angulation
horizontal angulation
centering the x ray beam

A

packet placement

105
Q

Radiographs that are too dark result from all of the following except:

developer is too hot
processing time was too long
the developer chemical mix was overactive
the film was exposed twice
the film was placed in the fixer first
A

The film was placed in the fixer first

106
Q

Which of the following would result in a blank or clear film when processed?

non exposure to x rays
extending the developing time
white light exposure inside the packet
overexposure

A

non exposure to x rays

107
Q

The follwing must be disclosed to the pateint beofre obtaining informed consent:

the purpose of the procedure and who will perform it
the potential benefits of receiving the procedure
the possible risks in having the procedure as well as not having it
all of the above

A

all of the above

108
Q

Incomplete disclosure to the patient before obtaining his or her informed consent may:

validate the consent
serve as partial consent
invalidate the consent
none of above

A

invalidate the consent

109
Q

The ability to share in the patient’s emotions and feelings is called:

A

empathy

110
Q

A substance that inhibits the growth of bacteria:

A

antiseptic

111
Q

A complete absence of pathogens, or disease causing microorganisms:

A

asepsis

112
Q

A microorganism capable of causing diease is an:

A

pathogen

113
Q

The use of a physical or chemical procedure to destroy all pathogens, including the highly resistant bacterial and mycotic spores:

A

sterilize

114
Q

The use of a chemical or physical procedure to inhibit or destroy pathogens with the exception of baterial and mycotic (fungal) spores:

A

disinfect

115
Q

The disinfectant that is a chemical germicide labeled as hospital grade that can not destroy spores, TB, or nonlipid virus is:

A

low level

116
Q

Film holding devices are classified as:

A

semi-critical objects

117
Q

A dark image may occur because of all of the following except:

the aiming ring is not pushed in next to the face before exposure
the developer is too concentrated
the film is left in the developer too long
the developer is too hot

A

the aiming ring is not pushed in next to the face before exposure

118
Q

A film processed under ideal conditions and used to compare subsequent radiographic images as:

A

reference film

119
Q

Processing errors can cause all of the following except:

cone cuts
dark spots
brown stains
reticulation

A

cone cuts

120
Q

Test 3- 21

A

nasal sinus

121
Q

Test 3- 22

A

sinus

122
Q

Test 3- 23

A

overlapping

123
Q

Test 3- 24

A

inverted y

124
Q

Which of the following would appear radiopaque on a radiograph?

incisive foramen
median palatine suture
mental foramen
mylohyoid ridge

A

mylohyoid ridge

125
Q

Test 3- 26

A

genial tubercles

126
Q

Test 3- 27

A

a mandibular central periapical

127
Q

Test 3- 28

A

processing error

128
Q

Test 3- 29

A

left premolar bite wing

129
Q

Test 3- 30

A

film placement error

130
Q

All of the following would be likely to appear on a maxillary anterior radiograph except:

maxillary tuberosity
nasal septum
incisive foramen
lateral fossa

A

maxillary tuberosity

131
Q

Which of the following would appear radiolucent on a radiograph?

maxillary sinus
anterior nasal spine
genial tubercles
mental ridge

A

maxillary sinus

132
Q

The ability to recognize errors made when taking dental radiographs will help the oral health care professional to:

keep patient radiation exposure to a minimum
provide optimal oral health care for the patient
properly diagnose oral conditions
avoid retake of radiographs
not continue to reproduce the same error
all of the above

A

all of the above

133
Q

Which of the following dental materials would appear the most radiolucent in a radiograph?

dental amalgam
acrylic partial
metallic crown
implant

A

acrylic partial

134
Q

All of the following may resemble caries radiographically except:

abrasion
cervical burnout
composite restorations
amalgam restorations

A

amalgam restorations

135
Q

Near the apex of the mandibular second premolars

A

mental foramen

136
Q

The densities seen on the daily radiograph appear lighter than the densities seen on the reference radiograph. This result indicates:

the developer is too weak
the developer is too concentrated
the developer is too cold
either a or c
either b or c
A

either a or c

137
Q

On BW radiographs, not being able to see the maxillary crestal bone may be caused by:

A

incorrect vertical angulation

138
Q

Radiographic evidence of a bone fracture appears as a radiolucent line that may resemble:

A

nutrient canal

139
Q

Which of the following would be best for imaging a generalized (all over) periodontal status?

select periapical radiographs exposed utilizing the bisecting technique
select periapical radiographs exposed utilizing the paralleling technique
posterior horizontal bitewing radiographs
series of vertical bitewing radiographs

A

series of vertical bitewing radiographs

140
Q

Which of the following would be best for imaging a generalized (all over) periodontal status?

select periapical radiographs exposed utilizing the bisecting technique
select periapical radiographs exposed utilizing the paralleling technique
posterior horizontal bitewing radiographs
series of vertical bitewing radiographs

A

series of vertical bitewing radiographs

141
Q

Radiographs may help to locate all of the following predisposing factors except one. Which one is this exception?

calculus
occlusal trauma
amalgam overhang
deep gingival pocket

A

deep gingival pocket

142
Q

Which of the following terms describes bone loss that occurs in a plane parallel to the cementoenamel junction of adjacent teeth?

irregular
vertical
horizontal
periapical

A

horizontal

143
Q

Which of the following appears radiographically as a radiolucent notch that is less than half-way through the enamel?

incipient proximal caries
moderate proximal caries
advanced proximal caries
severe proximal caries

A

incipient proximal caries

144
Q

Which level of caries appears radiographically as a radiolucent double triangle that is less than half way through the dentin toward the pulp?

A

advanced proximal caries

145
Q

All of the following mimic caries radiographically except one. Which one is the exception?

composite restoration
stainless steel crowns
cervical burnout
mach banding

A

stainless steel crowns

146
Q

Which of the following appears radiographically as an ill defined saucer shaped radiolucency below the CEJ?

proximal caries
occlusal caries
cemental caries
buccal/lingual caries

A

cemental caries

147
Q

A round or oval radiolucent shape that appears superimposed over the pulp chamber of the tooth may be:

interproximal caries
occlusal caries
cemental caries
buccal/lingual caries

A

buccal/lingual caries

148
Q

Which of the following describes the primary use of the bitewing radiograph?

examination of the apical areas of the teeth
examination of the apical and interproximal areas of teeth
examination of the interproximal areas of the teeth
examination of the pulp chambers of the teeth

A

interproximal areas of the teeth

149
Q

What is the correct vertical angulation used with the bitewing technique?

A

+10 degrees

150
Q

Mineralized plaque seen opposite the salivary ducts is

A

dental calculus

151
Q

A diligent search for recurrent caries should be made when radiographs detect:

open margins on restorations
interproximal restoration overhangs
restorations which appear to end short of the preparation margins
all of the above

A

all of the above

152
Q

When placing a size 4 film for an occlusal radiograph, the dot should be placed toward the:

mesial
distal
anterior
posterior

A

anterior

153
Q

The least reliable method of localization is the:

definitive-evaluation
right angle method
tube shift method
none of the above

A

definitive evaluation method

154
Q

All of the following are indications for exposing a panoramic radiograph except:

caries detection
location of an impaction
evaluation of eruption
imaging a lesion that is larger than normal film size

A

caries detection

155
Q

The horseshoe shaped zone of sharpness where an object would be imaged in a panoramic machine is known as the:

ghost image
cassette drum
focal trough
intensifying screen

A

focal trough

156
Q

Distinct pixels, arranged numerically to from a radiographic image is known as a/an:

A

digital image

157
Q

All of the following may be necessary to produce a digital radiograph except:

computer
scanner
film
x ray machine
special software
A

film

158
Q

Which of the following types of sensors requires a processing step where the sensor must be read by a laser device?

CCD
CMOS
PSP

A

PSP

159
Q

Defined as the ability to distinguish between closely spaced objects?

A

spatial resolution

160
Q

Which of the following infection control methods is required for an intraoral digital sensor?

disinfect and cover with a plastic barrier
ultrasonic with detergent and dry heat sterilization
wash with soap and water and cover with a plastic barrier
disinfect and autoclave
dispose and get a new one for each patient

A

Disinfect and cover with a plastic barrier

161
Q

All of the following are considered advantages of digital imaging compared to film except:

less radiation
less time to produce an image
no need for a darkroom
initial cost for set up is less

A

initial cost for set up is less

162
Q

Which of the following will a mandibular cross-sectional occlusal radiograph best image?

cleft palate
fractured mandible
large periapical cyst
sublingual swelling

A

sublingual swelling

163
Q

All of the following are reasons for exposing occlusal radiographs except:

locating foreign bodies
for use with special needs patients or children
examining sinus borders
evaluating perio disease
revealing sialoliths
A

evaluating perio disease

164
Q

You will see an exaggerated smile on a panoramic film where the patients head is:

A

tilted chin down

165
Q

Which describes a use of panoramic film?

dianosis of caries
evaluation of perio disease
evaluation of impacted molars
evaluation of periapical disease

A

evaluation of impacted molars

166
Q

Rare earth intensifying screens are recommended in a panoramic radiography because:

rare earth screens emit blue light
rare earth screens provide a more diagnostic image
rare earth screens require less x ray exposure for the patient
the images convert faster in automatic processes

A

rare earth screens require less x ray exposure for the patient

167
Q

The imaginary line that passes from the bottom of the eye socket through the top of the ear canal is termed the:

A

frankfort plane

168
Q

You will see a frown on a panoramic film where the patient’s head is:

A

tilted chin up

169
Q

You will see the anterior teeth appear skinny and out of focus on a panoramic film where the patient’s head is:

A

the anterior teeth are positioned anterior to the focal trough

170
Q

You will the anterior teeth appear fat and out of focus on a panoramic film where the patient’s head is:

A

the anterior teeth are positioned posterior to the focal trough

171
Q

Radiopaque artifact seen on a panoramic film that is produced when a radiodense object is penetrated twice by the x ray beam:

exaggerated smile
reverse smile
ghost image
densosity

A

ghost image

172
Q

SLOB

A

Same Lingual Opposite Buccal

173
Q

A dark shadow obscuring the apices of the maxillary anterior teeth in a panorex is most likely caused by which of the following:

lead apron in the way
facial jewelry not removed
chin not rested on chin rest
tongue is not resting against palate
patient is not occluded on bite guide/cotton roll
A

tongue is not resting against palate

174
Q

Which of the following will a mandibular cross-sectional occlusal radiograph best image?

large periapical cyst
fractured mandible
cleft lip
sublingual swelling

A

sublingual swelling

175
Q

Periodontal bone changes imaged on radiographs include all of the following except:

amount of bone loss
pattern of bone loss
distribution of bone loss
current active status of bone loss

A

current active status of bone loss

176
Q

Where should the embossed dot be positioned when placing an occlusal film packet intraorally?

A

toward the anterior

177
Q

All of the following should be done to prepare the patient for occlusal radiographs except:

explain the procedure
prepare the film holder
perform a cursory oral inspection
ask the patient to remove eyeglasses

A

prepare the film holder

178
Q

All of the following are true regarding occlusal radiographs except:

to detect incipient, interproximal caries
to locate soft tissue calcifications
to assist in evaluation fractures
to reveal supernumerary teeth

A

to detect incipient, interproximal caries

179
Q

All of the following statements regarding pixels are correct except one. Which one is the exception?

the number and size of pixels determines the spatial resolution of an image
the more pixels in an image, the higher the resolution and the sharper the image
a pixel with a stored number of 0 would be pure white
when the number of pixels is low, the image appears to have jagged edges

A

a pixel with a stored number of 0 would be pure white

180
Q

All of the following statements regarding charge-coupled device sensors are correct except one. Which one is this exception?

contains 640 x 480 individual pixels
also used in fax machines and video cameras
most widely used image receptor in dental digital imaging
first developed in the 1990s

A

first developed in the 1990s

181
Q

All of the following statements regarding intensifying screens are correct except on. Which one is the exception?

are sensitive to white light exposure
transfer x ray energy into visible light
work in pairs
receive less radiation to produce an image

A

are sensitive to white light exposure

182
Q

Which of the following statements regarding intensifying screens is correct?

calcium tungstate crystals produce a latent image on the film with less radiation exposure than rare earth screens
larger crystals produce an image with greater resolution than smaller crystals
the larger the crystal size, the more radiation required to produce an image
the thicker the emulsion, the faster the speed of the screen

A

the thicker the emulsion, the faster the speed of the screen

183
Q

All of the following statements regarding principles of panoramic radiology are correct except one. Which one is the exception?

the x ray beam is directed toward the stationary cassette
the rotational center is the functional focus of the projection
the patient stands or is seated in a stationary position
the radiation beam passes through the patient towards the cassette

A

the x ray beam is directed toward the stationary cassette

184
Q

What teeth should be imaged on a maxillary premolar periapical radiograph

A

distal portion of the canine, first pre molar, second pre molar, first molar, mesial portion of the second molar

185
Q

All of the following are goals of the dental radiographer except:

reducing the radiation dose used during an exposure
professional conduct
presenting confidence to gain patient acceptance
increasing the demand for dental x rays

A

increasing the demand for dental x rays

186
Q

All of the following may be protected with a plastic barrier to maintain infection control during the radiographic procedure except:

film packet
film holder
exposure button
PID and tube head

A

film holder

187
Q

Which of the following would be the best method for preventing a gag reflex?

apply a topical anesthetic
use salt on the tip of the tongue
provide instructions confidently
rinse with an antiseptic mouth rinse

A

provide instructions confidently

188
Q

Which of the following projections is most likely to intiate a gag reflex?

premoler bitewing
molar bitewing
mandibular canine periapical
maxillary molar periapical

A

maxillary molar periapical

189
Q

The method of show- tell -do is beneficial in all of the following situations except:

visually impaired patients
children
hyperactive individuals
patients with a different cultural background and language

A

visually impaired patients

Radiology (3 decks)

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